CN113046776B - Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater - Google Patents

Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater Download PDF

Info

Publication number
CN113046776B
CN113046776B CN202110299954.7A CN202110299954A CN113046776B CN 113046776 B CN113046776 B CN 113046776B CN 202110299954 A CN202110299954 A CN 202110299954A CN 113046776 B CN113046776 B CN 113046776B
Authority
CN
China
Prior art keywords
wood
aerogel
hydrogen
oxygen
electrolysis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110299954.7A
Other languages
Chinese (zh)
Other versions
CN113046776A (en
Inventor
惠彬
陈洪姣
杨东江
夏延致
李坚
邹译慧
张克伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao University
Original Assignee
Qingdao University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao University filed Critical Qingdao University
Priority to CN202110299954.7A priority Critical patent/CN113046776B/en
Publication of CN113046776A publication Critical patent/CN113046776A/en
Application granted granted Critical
Publication of CN113046776B publication Critical patent/CN113046776B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

A preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater relate to a preparation method and application of wood aerogel. The invention aims to solve the problems that the activity of a full-electrolysis dual-function catalyst in alkaline seawater is insufficient, insoluble magnesium hydroxide/calcium hydroxide and some interfering ions are precipitated from the seawater to the surface of an electrode, and accordingly an OER/HER catalyst is poisoned. The method comprises the following steps: firstly, removing lignin and hemicellulose of natural porous wood; secondly, activating; thirdly, immersing the activated wood aerogel into a plating solution for plating; fourthly, etching and activating; and fifthly, vacuum drying. The wood aerogel used for producing oxygen and hydrogen by electrolyzing alkaline seawater is used for producing oxygen and hydrogen by full electrolysis in the alkaline seawater. The invention can obtain the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater.

Description

Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater
Technical Field
The invention relates to a preparation method and application of a wood aerogel.
Background
The production of hydrogen by electrolysis of water is one of the green and sustainable routes for hydrogen fuel production, however, many water electrolysers containing alkaline or acidic electrolytes are made from fresh water, the shortage of fresh water resources is getting worse, and the development of more advanced water diversion processes is seriously hindered. In contrast, seawater is abundant on our planet and also promotes the ionic conductivity of the electrolyte due to the large amount of dissolved salts. Therefore, direct electrolysis of seawater, rather than fresh water, is very advantageous and promising. However, the main problem of the seawater decomposition technique is the competition between the Oxygen Evolution Reaction (OER) and the Chlorine Evolution Reaction (CER) of the anode. Under alkaline conditions, chloride ions are readily converted to hypochlorite, which has an onset potential about 490mV higher than the OER onset potential. Seawater electrolysis therefore requires highly active OER catalysts to produce high current densities at overpotentials well below that required for chloride ion oxidation. Another problem that has hindered the development of seawater electrolysis is the precipitation of insoluble magnesium/calcium hydroxide and some interfering ions from the seawater onto the electrode surfaces, which cover them and poison the OER/HER catalyst. The common foamed nickel and copper substrate is easy to corrode under strong acid and strong alkali, and active substances are easy to fall off from the surface of the substrate under the impact of large current, so that the heterogeneous interface is unstable and is not favorable for large-scale oxygen and hydrogen evolution. Therefore, the development of self-supporting nanoelectrodes with structural characteristics of high specific surface area, three-dimensional multilevel structure, low tortuosity and orderly arranged open channels is highly desirable because it can rapidly release bubbles and allow insoluble precipitates and interfering ions deposited on the surface of the electrode to escape, thereby enhancing OER and HER activity.
Disclosure of Invention
The invention aims to solve the problems that the activity of a full-electrolysis dual-function catalyst in alkaline seawater is insufficient, and insoluble magnesium hydroxide/calcium hydroxide and some interfering ions are precipitated from the seawater to the surface of an electrode, so that an OER/HER catalyst is poisoned, and provides a preparation method and application of a wood aerogel for producing oxygen and hydrogen by electrolysis of alkaline seawater.
A preparation method of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater is completed according to the following steps:
firstly, removing lignin and hemicellulose of natural porous wood, then washing, and finally freeze-drying to obtain wood aerogel with lignin and hemicellulose removed;
secondly, soaking the wood aerogel with the lignin and the hemicellulose removed into NaBH4Activating in the mixed solution of NaOH to obtain activated wood aerogel;
thirdly, immersing the activated wood aerogel into a plating solution for plating, taking out the wood aerogel and then drying the wood aerogel in vacuum to obtain the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy;
the plating solution in the third step is prepared from NiSO4·6H2O、Na2MoO4.2H2O、NaH2PO2·H2O、CH3COONa、C6H5Na3O7·2H2O、NH3·H2O and water;
fourthly, putting the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating in the O mixed solution to obtain sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel;
and fifthly, carrying out vacuum drying on the sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel to obtain the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater.
The wood aerogel used for producing oxygen and hydrogen by electrolyzing alkaline seawater is used for producing oxygen and hydrogen by full electrolysis in the alkaline seawater.
The principle and the advantages of the invention are as follows:
firstly, loading a nickel-molybdenum-phosphorus alloy on the pore wall of the prepared wood aerogel by a chemical plating technology, and then doping sulfur and iron elements through etching activation to obtain sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel; researches find that the good hydrophilicity of the wood aerogel is beneficial to the diffusion of the electrolyte; the open and well-arranged multiple channels in the wood aerogel play a crucial role in the aspect that precipitates/ions are enclosed in active sites far away from a catalyst through explosive force generated by bubble explosion when bubbles are quickly released, so that the OER/HER activity in alkaline seawater is greatly improved;
secondly, the invention is used for the alkaline seawater electricityThe wood aerogel for decomposing oxygen and hydrogen can reach 500 mA-cm under very low overpotential (OER and HER are 297mV and 258mV respectively)-2The current density, showing impressive bifunctional activity; therefore, the technology of the invention has the opportunity to provide a promising approach for promoting the integral decomposition process of the seawater.
The wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater, which is prepared by the invention, is used for producing oxygen and hydrogen in alkaline seawater by full electrolysis.
Drawings
FIG. 1 is an SEM image of a natural balsawood at 500 times magnification in one step of the example;
fig. 2 is an SEM image of 500 times magnification of lignin and hemicellulose removed wood aerogel obtained in one step one of the example;
FIG. 3 is an SEM image of 500 times magnification of wood aerogel loaded with nickel-molybdenum-phosphorus alloy obtained in the third step of the example;
FIG. 4 is an SEM image of 20000 times magnification of wood aerogel loaded with Ni, Mo and P alloy obtained in the third step of the example;
FIG. 5 is an SEM image of 500 times magnification of wood aerogel for the electrolysis production of hydrogen and oxygen by alkaline seawater obtained in the fifth step of the example;
FIG. 6 is an SEM image of 20000 times magnification of the wood aerogel for the electrolysis production of oxygen and hydrogen by alkaline seawater obtained in the fifth step of the example;
FIG. 7 is a high resolution TEM image of a wood aerogel for electrowinning of hydrogen and oxygen from alkaline seawater obtained in step five of the example;
fig. 8 is an XRD chart, in which 1 is Ni, 2 is NiP/wood aerogel prepared in comparative example, 3 is wood aerogel supporting nickel-molybdenum-phosphorus alloy obtained in the third step of example, and 4 is wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of example;
fig. 9 is a raman spectrum, in which 1 is a wood aerogel loaded with nickel-molybdenum-phosphorus alloy obtained in the third step of the example, and 2 is a wood aerogel used for producing oxygen and hydrogen by electrolyzing alkaline seawater obtained in the fifth step of the example;
FIG. 10 is a water contact angle image of a wood aerogel for the electrolytic production of hydrogen and oxygen from alkaline seawater obtained in step five of the example;
FIG. 11 is an OER polarization curve of wood aerogel in 1mol/L KOH solution, in which 1 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in example two, 2 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in step five of example, 3 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in example three, and 4 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in example four;
FIG. 12 is OER polarization curves measured in different electrolytes, in which 1 is an OER polarization curve measured in a mixed solution of KOH and NaCl as a working electrode of the wood aerogel for oxygen and hydrogen production by alkaline seawater electrolysis obtained in the fifth step of the example, 2 is an OER polarization curve measured in a seawater KOH solution as a working electrode of the wood aerogel for oxygen and hydrogen production by alkaline seawater electrolysis obtained in the fifth step of the example, and 3 is an OER polarization curve measured in a seawater KOH solution as an Ir/C working electrode;
FIG. 13 is a Tafel slope curve of OER tested in different electrolytes, wherein 1 is the Tafel slope curve of OER tested in KOH seawater solution for alkaline seawater electrolysis for oxygen and hydrogen production by wood aerogel obtained in the fifth step of the example as working electrode, 2 is the Tafel slope curve of OER tested in mixed solution of KOH and NaCl for alkaline seawater electrolysis for oxygen and hydrogen production by wood aerogel obtained in the fifth step of the example as working electrode, and 3 is the Tafel slope curve of OER tested in KOH seawater solution for Ir/C as working electrode;
FIG. 14 is an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in different electrolytes, wherein 1 is D an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example as a working electrode in a mixed solution of KOH and NaCl, 2 is an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example as a working electrode in a KOH seawater solution, and 3 is Ir/C an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis as a working electrode in a KOH seawater solution;
fig. 15 is a graph of HER polarization curve, in which 1 is the HER polarization curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis in KOH seawater solution as the working electrode obtained in the fifth step of the example, and 2 is the HER polarization curve of Ir/C as the working electrode in KOH seawater solution;
fig. 16 is a Tafel slope curve chart of HER tested in KOH seawater solution, in which 1 is the Tafel slope curve of HER tested in KOH seawater solution with wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis as working electrode obtained in step five of the example, and 2 is the Tafel slope curve of HER tested in KOH seawater solution with Ir/C as working electrode;
fig. 17 is a HER alternating current impedance spectrum measured in a KOH seawater solution, where 1 is a HER alternating current impedance spectrum curve measured in the KOH seawater solution by using the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example as a working electrode, and 2 is a HER alternating current impedance spectrum curve measured in the KOH seawater solution by using Ir/C as a working electrode;
fig. 18 is a LSV curve graph of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in different electrolytes, wherein 1 is an LSV curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in a KOH solution of 1mol/L, 2 is an LSV curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in a mixed solution of KOH and NaCl, and 3 is an LSV curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in a KOH seawater solution;
FIG. 19 is an i-t stable cycle curve of the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis as a working electrode in a mixed solution of KOH and NaCl obtained in the fifth step of the example, wherein 1 is cycle 10h, 2 is cycle 20h, and 3 is cycle 30 h.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit of the invention.
The first embodiment is as follows: the embodiment of the invention relates to a preparation method of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater, which is completed by the following steps:
firstly, removing lignin and hemicellulose of natural porous wood, then washing, and finally freeze-drying to obtain wood aerogel with lignin and hemicellulose removed;
secondly, soaking the wood aerogel with the lignin and the hemicellulose removed into NaBH4Activating in the mixed solution of NaOH to obtain activated wood aerogel;
thirdly, immersing the activated wood aerogel into a plating solution for plating, taking out the wood aerogel and then drying the wood aerogel in vacuum to obtain the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy;
the plating solution in the third step is prepared from NiSO4·6H2O、Na2MoO4.2H2O、NaH2PO2·H2O、CH3COONa、C6H5Na3O7·2H2O、NH3·H2O and water;
fourthly, putting the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating in the O mixed solution to obtain sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel;
and fifthly, carrying out vacuum drying on the sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel to obtain the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater.
The principle and advantages of the embodiment are as follows:
firstly, loading a nickel-molybdenum-phosphorus alloy on the pore wall of the prepared wood aerogel by a chemical plating technology, and then doping sulfur and iron elements through etching activation to obtain sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel; researches find that the good hydrophilicity of the wood aerogel is beneficial to the diffusion of the electrolyte; the open and well-arranged multiple channels in the wood aerogel play a crucial role in the aspect that precipitates/ions are enclosed in active sites far away from a catalyst through explosive force generated by bubble explosion when bubbles are quickly released, so that the OER/HER activity in alkaline seawater is greatly improved;
secondly, the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater prepared by the embodiment can reach 500 mA-cm under very low overpotential (OER and HER are 297mV and 258mV respectively)-2The current density, showing impressive bifunctional activity; therefore, the technology of the embodiment has the opportunity of providing a promising approach for promoting the integral decomposition process of the seawater.
The wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater, which is prepared by the embodiment, is used for producing oxygen and hydrogen by full electrolysis in alkaline seawater.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the method for removing lignin and hemicellulose of the natural porous wood in the first step comprises the following steps: firstly, immersing natural porous wood into NaOH and Na with the temperature of 90-100 DEG C2SO3The mixed solution is immersed in NaOH solution with the temperature of 70-80 ℃ for 6-8H, and finally immersed in H with the temperature of 40-60 DEG C2O2The solution is added for 1 to 3 hours. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: NaOH and Na as described in step one2SO3The concentration of NaOH in the mixed solution is 80 g/L-100 g/L, Na2SO3The concentration of (A) is 40 g/L-50 g/L; the mass fraction of the NaOH solution is 5-8%; said H2O2Concentration of the solutionThe degree is 65 g/L-85 g/L. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: the natural porous wood in the step one is balsawood with the size of 2.0cm multiplied by 0.2 cm. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the first step, firstly, lignin and hemicellulose of the natural porous wood are removed, then deionized water is used for washing for 3 to 5 times, and finally, the natural porous wood is frozen and dried for 40 to 48 hours at the temperature of between 55 ℃ below zero and 60 ℃ below zero. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: NaBH described in step two4The preparation method of the mixed solution of NaOH comprises the following steps: 1.25g of NaBH4Dissolving the NaBH into 250mL of NaOH solution with the concentration of 2g/L to obtain NaBH4Mixed solution of NaOH; the activation time in the step two is 10 min-20 min. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: NiSO in plating solution in the third step4·6H2The concentration of O is 20 g/L-30 g/L, Na2MoO4.2H2The concentration of O is 1 g/L-2 g/L, NaH2PO2·H2The concentration of O is 20 g/L-25 g/L, CH3COONa concentration of 0.10-0.15 g/L, C6H5Na3O7·2H2O concentration of 25-30 g/L, NH3·H2The concentration of O is 50 g/L-65 g/L; the temperature of the plating solution in the third step is 60-75 ℃; the plating time is 0.5 h-1 h; the temperature of the vacuum drying in the third step is 40-60 ℃, and the time of the vacuum drying is 8-12 h. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: in the fourth stepSaid Fe (NO)3)3·9H2O and Na2S2O3·5H2The preparation method of the O mixed solution comprises the following steps: 0.35g of Fe (NO)3)3·9H2O and 0.05g of Na2S2O3·5H2Dissolving O in 10mL deionized water to obtain Fe (NO)3)3·9H2O and Na2S2O3·5H2And O, mixing the solution. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: the etching activation time in the fourth step is 2 min-10 min; and the temperature of the vacuum drying in the step five is 40-60 ℃, and the time of the vacuum drying is 8-12 h. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the embodiment is that the wood aerogel used for producing oxygen and hydrogen by electrolyzing alkaline seawater is used for producing oxygen and hydrogen by full electrolysis in the alkaline seawater.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows: a preparation method of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater is completed according to the following steps:
firstly, immersing natural porous wood into NaOH and Na with the temperature of 100 DEG C2SO3The mixed solution is immersed in a NaOH solution at a temperature of 80 ℃ for 8H and then immersed in H at a temperature of 60 DEG for 10H2O2Washing the solution for 1h with deionized water for 3 times, and finally putting the solution into a freeze dryer for freeze drying for 48h at-55 ℃ to obtain the wood aerogel without lignin and hemicellulose;
the natural porous wood in the step one is natural balsawood with the size of 2.0cm multiplied by 0.2 cm;
NaOH and Na as described in step one2SO3The concentration of NaOH in the mixed solution of (1) is 100g/L, Na2SO3The concentration of (A) is 50 g/L; the mass fraction of the NaOH solution is 8%; said H2O2The concentration of the solution is 85 g/L;
secondly, soaking the wood aerogel with the lignin and the hemicellulose removed into NaBH4Activating in the mixed solution of NaOH for 20min to obtain activated wood aerogel;
NaBH described in step two4The preparation method of the mixed solution of NaOH comprises the following steps: 1.25g of NaBH4Dissolving the NaBH into 250mL of NaOH solution with the concentration of 2g/L to obtain NaBH4Mixed solution of NaOH;
thirdly, immersing the activated wood aerogel into a plating solution at the temperature of 60 ℃ for plating for 1h, taking out the wood aerogel and then carrying out vacuum drying at the temperature of 60 ℃ for 12h to obtain the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy;
the plating solution in the third step is prepared from NiSO4·6H2O、Na2MoO4.2H2O、NaH2PO2·H2O、CH3COONa、C6H5Na3O7·2H2O、NH3·H2O and water, NiSO in the plating solution4·6H2The concentration of O is 30g/L, Na2MoO4.2H2The concentration of O is 2g/L, NaH2PO2·H2O concentration of 25g/L, CH3COONa concentration of 0.15g/L, C6H5Na3O7·2H2O concentration of 30g/L, NH3·H2The concentration of O is 50 g/L;
fourthly, putting the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating the O mixed solution for 2min to obtain sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel;
fe (NO) described in step four3)3·9H2O and Na2S2O3·5H2The preparation method of the O mixed solution comprises the following steps: 0.35g of Fe (NO)3)3·9H2O and 0.05g of Na2S2O3·5H2Dissolving O in 10mL deionized water to obtain Fe (NO)3)3·9H2O and Na2S2O3·5H2O, mixing the solution;
fifthly, carrying out vacuum drying on the sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel at 60 ℃ for 12 hours to obtain the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater.
Example two: the present embodiment is different from the first embodiment in that: in the fourth step, the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy is put into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating in the O mixed solution for 0 min. Other steps and parameters are the same as those in the first embodiment.
Example three: the present embodiment is different from the first embodiment in that: in the fourth step, the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy is put into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating in the O mixed solution for 5 min. Other steps and parameters are the same as those in the first embodiment.
Example four: the present embodiment is different from the first embodiment in that: in the fourth step, the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy is put into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating in the O mixed solution for 10 min. Other steps and parameters are the same as those in the first embodiment.
Comparative example: the preparation method of the NiP/wood aerogel is completed according to the following steps:
firstly, immersing natural porous wood into NaOH and Na with the temperature of 100 DEG C2SO3The mixed solution is immersed in a NaOH solution at a temperature of 80 ℃ for 8H and then immersed in H at a temperature of 60 DEG for 10H2O2Washing the solution for 1h with deionized water for 3 times, and finally putting the solution into a freeze dryer for freeze drying for 48h at-55 ℃ to obtain the wood aerogel without lignin and hemicellulose;
the natural porous wood in the step one is natural balsawood with the size of 2.0cm multiplied by 0.2 cm;
step oneNaOH and Na as described in (1)2SO3The concentration of NaOH in the mixed solution of (1) is 100g/L, Na2SO3The concentration of (A) is 50 g/L; the mass fraction of the NaOH solution is 8%; said H2O2The concentration of the solution is 85 g/L;
secondly, soaking the wood aerogel with the lignin and the hemicellulose removed into NaBH4Activating in the mixed solution of NaOH for 20min to obtain activated wood aerogel;
NaBH described in step two4The preparation method of the mixed solution of NaOH comprises the following steps: 1.25g of NaBH4Dissolving the NaBH into 250mL of NaOH solution with the concentration of 2g/L to obtain NaBH4Mixed solution of NaOH;
thirdly, immersing the activated wood aerogel into a plating solution at the temperature of 60 ℃ for plating for 1h, taking out the wood aerogel and then carrying out vacuum drying at the temperature of 60 ℃ for 12h to obtain the NiP/wood aerogel;
the plating solution in the third step is prepared from NiSO4·6H2O、NaH2PO2·H2O、CH3COONa、C6H5Na3O7·2H2O、NH3·H2O and water, NiSO in the plating solution4·6H2The concentration of O is 30g/L, NaH2PO2·H2O concentration of 25g/L, CH3COONa concentration of 0.15g/L, C6H5Na3O7·2H2O concentration of 30g/L, NH3·H2The concentration of O was 50 g/L.
FIG. 1 is an SEM image of a natural balsawood at 500 times magnification in one step of the example;
fig. 2 is an SEM image of 500 times magnification of lignin and hemicellulose removed wood aerogel obtained in one step one of the example;
FIG. 3 is an SEM image of 500 times magnification of wood aerogel loaded with nickel-molybdenum-phosphorus alloy obtained in the third step of the example;
FIG. 4 is an SEM image of 20000 times magnification of wood aerogel loaded with Ni, Mo and P alloy obtained in the third step of the example;
FIG. 5 is an SEM image of 500 times magnification of wood aerogel for the electrolysis production of hydrogen and oxygen by alkaline seawater obtained in the fifth step of the example;
FIG. 6 is an SEM image of 20000 times magnification of the wood aerogel for the electrolysis production of oxygen and hydrogen by alkaline seawater obtained in the fifth step of the example;
as can be seen from the analysis of fig. 1 and fig. 2, the natural balsawood shows an internal three-dimensionally interconnected porous structure, and abundant nanopores and a rough surface structure are formed in situ between cellulose nanofibers due to the directional separation of part of lignin/hemicellulose; by analyzing fig. 3-4, showing a relatively smooth NiMoP alloy surface uniformly and tightly coated on the wood aerogel, the pore size of the blood vessels and tracheids of the wood aerogel is reduced due to the coverage of the conductive ni-mo-p; by analyzing fig. 5 and fig. 6, the etched wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis maintains the 3D skeleton thereof. However, its directional channels increase in size and many new nanoparticles are formed on the surface, and this morphological change can significantly increase the accessible surface area and provide an effective electrolyte permeation channel.
FIG. 7 is a high resolution TEM image of a wood aerogel for electrowinning of hydrogen and oxygen from alkaline seawater obtained in step five of the example;
as can be seen from the analysis of fig. 7, the wood aerogel has a unique heterogeneous structural functional structure on the surface. The inner highly conductive nickel phosphorous layer will provide an electron path so that the sulfur-phosphorous co-doped nickel-molybdenum-iron hydroxide layer will have a thickness of about 100 nanometers. The sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide formed by simply etching NiMoP for two minutes has an excellent nanorod array structure, which contributes to a considerable surface area, allowing for the potential presence of many active sites for catalytic reactions.
Fig. 8 is an XRD chart, in which 1 is Ni, 2 is NiP/wood aerogel prepared in comparative example, 3 is wood aerogel supporting nickel-molybdenum-phosphorus alloy obtained in the third step of example, and 4 is wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of example;
as can be seen from analysis of fig. 8, all samples had three strong diffraction peaks. The 2-step offset of the nickel molybdenum phosphorus alloy loaded wood aerogel was slightly reduced (0.33 °) compared to the NiP/wood aerogel. The corresponding enhanced peak strength and reduced peak width indicate that Mo element has been successfully doped in the lattice of Ni, thereby improving crystallinity. And after the NiMoP is activated in situ, the formed wood aerogel used for producing oxygen and hydrogen by electrolyzing alkaline seawater is formed.
Fig. 9 is a raman spectrum, in which 1 is a wood aerogel loaded with nickel-molybdenum-phosphorus alloy obtained in the third step of the example, and 2 is a wood aerogel used for producing oxygen and hydrogen by electrolyzing alkaline seawater obtained in the fifth step of the example;
by analyzing FIG. 9, at 304, 390, 534 and 614cm-1The peak indicates the successful modification of beta-FeOOH in the catalyst. 690. 858, 923 and 974cm-1The peak at (A) indicates the presence of alpha-MoO3Thus reflecting the directional introduction of high-valence metal.
FIG. 10 is a water contact angle image of a wood aerogel for the electrolytic production of hydrogen and oxygen from alkaline seawater obtained in step five of the example;
as can be seen from analysis of fig. 10, the wood aerogel exhibits super-hydrophilicity as compared to natural wood.
Application test: example hydrogen production performance test of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater obtained in step five of the first step of the embodiment:
the experiment utilizes a CHI 760E electrochemical workstation to carry out characterization under a three-electrode system (working electrode: wood aerogel for producing oxygen and hydrogen through alkaline seawater electrolysis obtained in the fifth step of the embodiment; reference electrode: saturated Hg/HgO electrode; auxiliary electrode: carbon rod electrode), all samples are tested at room temperature, and the wood aerogel for producing oxygen and hydrogen through alkaline seawater electrolysis obtained in the fifth step of the embodiment is tested in a cyclic voltammetry Curve (CV), a linear scanning voltammetry curve (LSV) and an alternating current impedance spectrum (EIS) in a KOH solution of 1mol/L, a mixed solution of KOH and NaCl (the concentration of KOH in the mixed solution of KOH and NaCl is 1mol/L, and the concentration of NaCl in the mixed solution of KOH and NaCl is 0.5mol/L) and a KOH seawater solution (the solute in the KOH seawater solution is KOH, the solvent is seawater, and the concentration of KOH in the mixed solution is 1 mol/L).CV curve: setting a testing method as cyclic voltammetry, adjusting the voltage range to-0.8V to-1.1V, and performing working electrode activation treatment until the electrode activation curve is stable; LSV curve: setting the test method as linear scanning method, respectively using 2mV s-1And 5mV s-1The scan rate of (a) obtains Linear Sweep Voltammetry (LSV) polarization curves for OER and HER. Adjusting the voltage ranges of OER and HER to be 0V-1.3V and-0.8V-1.9V respectively, testing to obtain a polarization curve of the working electrode, and analyzing the curve to obtain the rising potential, Tafel slope, overpotential and the like of the material; EIS spectrogram: testing the electrode by AC impedance method, setting open-circuit voltage as voltage and frequency as 105Hz～10-2Hz, the alternating voltage is 5mV, and an alternating impedance spectrogram is obtained; and (3) cyclic stability: the test was carried out using a time-current curve, with a current density of 100mA cm-2And 500mA · cm-2The corresponding constant working voltage enables the electrode to keep a continuous full-hydrolysis oxygen-hydrogen production state for 30h (in a time-current curve test, in order to prevent the damage of a large current to an electrochemical workstation instrument, the size of a test piece is adjusted to be 1.0cm multiplied by 0.5cm, and the current density is 100 mA-cm-2And 500mA · cm-2The size of the corresponding test piece is 1cm × 1 cm); in addition, the LSV curves of the wood aerogel for the production of oxygen and hydrogen by the electrolysis of alkaline seawater obtained in step five of the example in various solutions are shown, and the above properties are shown in fig. 11 to 19.
Comparative example of application test: hydrogen performance test of Ir/C electrolyzed water:
the experiment is characterized by using a CHI 760E electrochemical workstation under a three-electrode system (a working electrode, namely an Ir/C electrode (Ir/C is a mixture of metallic iridium and carbon, wherein the mass fraction of Ir is 20%), a reference electrode, namely a saturated Hg/HgO electrode, and an auxiliary electrode, namely a carbon rod electrode), wherein the test temperature of all samples is room temperature, and the cyclic voltammetry Curve (CV), the linear scanning voltammetry curve (LSV) and the alternating current impedance spectrum (EIS) of the Ir/C electrode in a KOH seawater solution (the solute in the KOH seawater solution is KOH, the solvent is seawater, and the concentration of KOH is 1mol/L) are tested.
FIG. 11 is an OER polarization curve of wood aerogel in 1mol/L KOH solution, in which 1 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in example two, 2 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in step five of example, 3 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in example three, and 4 is the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in example four;
as can be seen from FIG. 11, the wood aerogel used for the alkaline seawater electrolysis for producing hydrogen and oxygen only needs to have overpotentials as low as 263, 279 and 293mV to obtain 50, 100 and 200 mA-cm respectively-2Indicating that S, P- (Ni, Mo, Fe) OOH/wood aerogel prepared for the electrolysis of alkaline seawater to produce hydrogen and oxygen greatly improved OER activity.
FIG. 12 is OER polarization curves measured in different electrolytes, in which 1 is an OER polarization curve measured in a mixed solution of KOH and NaCl as a working electrode of the wood aerogel for oxygen and hydrogen production by alkaline seawater electrolysis obtained in the fifth step of the example, 2 is an OER polarization curve measured in a seawater KOH solution as a working electrode of the wood aerogel for oxygen and hydrogen production by alkaline seawater electrolysis obtained in the fifth step of the example, and 3 is an OER polarization curve measured in a seawater KOH solution as an Ir/C working electrode;
as can be seen from FIG. 12, the wood aerogel for the electrolysis production of oxygen and hydrogen by alkaline seawater obtained in the fifth step of the example only requires very low overpotentials of 258, 286 and 306mV in alkaline simulated seawater to reach 50, 100 and 200 mA-cm respectively-2Current density of (2) even at 500mA · cm-2The required overpotential is also only 320mV at higher current densities, much lower than the 490mV overpotential required to initiate chloride oxidation to hypochlorite, showing superior OER activity over the unactivated samples.
FIG. 13 is a Tafel slope curve of OER tested in different electrolytes, wherein 1 is the Tafel slope curve of OER tested in KOH seawater solution for alkaline seawater electrolysis for oxygen and hydrogen production by wood aerogel obtained in the fifth step of the example as working electrode, 2 is the Tafel slope curve of OER tested in mixed solution of KOH and NaCl for alkaline seawater electrolysis for oxygen and hydrogen production by wood aerogel obtained in the fifth step of the example as working electrode, and 3 is the Tafel slope curve of OER tested in KOH seawater solution for Ir/C as working electrode;
as can be seen from FIG. 13, the Tafel slope of OER in KOH seawater solution of the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in step five of the example as the working electrode is 45.5mV dec-1In the fifth step of the example, the Tafel slope of OER in the mixed solution of KOH and NaCl as the working electrode of the wood aerogel for producing hydrogen and oxygen by electrolyzing alkaline seawater obtained in the fifth step of the example is 67.5mVdec-1The Tafel slope of OER in KOH seawater solution with Ir/C as working electrode is 59.1mVdec-1(ii) a The wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater obtained in the fifth step of the example shows rapid dynamic performance.
FIG. 14 is an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in different electrolytes, wherein 1 is an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in a mixed solution of KOH and NaCl as a working electrode, 2 is an OER AC impedance spectrum of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in a mixed solution of KOH and NaCl as a working electrode, and 3 is an OER AC impedance spectrum of the Ir/C as a working electrode in a KOH seawater solution;
as can be seen from fig. 14, the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in step five of the example has good charge transfer performance.
Fig. 15 is a graph of HER polarization curve, in which 1 is the HER polarization curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis in KOH seawater solution as the working electrode obtained in the fifth step of the example, and 2 is the HER polarization curve of Ir/C as the working electrode in KOH seawater solution;
as can be seen from FIG. 15, the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis obtained in step five of the example is subjected to electric currentThe densities are 50 and 100mAcm respectively-2Showing slightly higher overpotentials of 187 and 212mV, respectively. Even if a larger 500mA cm is obtained-2The current density of (a) also requires a very low overpotential of 258mV, which is very similar to the overpotential of 249mV required for Ir/C as a working electrode. This shows that the wood aerogel for the electrolytic production of oxygen and hydrogen by alkaline seawater obtained in step five of the example exhibits excellent catalytic cycle stability in seawater.
Fig. 16 is a Tafel slope curve chart of HER tested in KOH seawater solution, in which 1 is the Tafel slope curve of HER tested in KOH seawater solution with wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis as working electrode obtained in step five of the example, and 2 is the Tafel slope curve of HER tested in KOH seawater solution with Ir/C as working electrode;
as can be seen from FIG. 16, the Tafel slope of HER of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis as the working electrode in KOH seawater solution obtained in the fifth step of the example is 91.7mVdec-1The Tafel slope of HER tested by Ir/C as working electrode in KOH seawater solution is 59.7mVdec-1The wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater obtained in the fifth step of the example shows rapid dynamic performance.
Fig. 17 is a HER alternating current impedance spectrum measured in a KOH seawater solution, where 1 is a HER alternating current impedance spectrum curve measured in the KOH seawater solution by using the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example as a working electrode, and 2 is a HER alternating current impedance spectrum curve measured in the KOH seawater solution by using Ir/C as a working electrode;
as can be seen from fig. 17, the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in step five of the example has good charge transfer performance.
Fig. 18 is a LSV curve graph of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in different electrolytes, wherein 1 is an LSV curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in a KOH solution of 1mol/L, 2 is an LSV curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in a mixed solution of KOH and NaCl, and 3 is an LSV curve of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example, which is used as a working electrode and tested in a KOH seawater solution;
as can be seen from fig. 18, the voltage of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in the KOH solution of 1mol/L as the working electrode is 1.691V, the voltage of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in the mixed solution of KOH and NaCl as the working electrode is 1.703V, and the voltage of the wood aerogel for producing hydrogen and oxygen through alkaline seawater electrolysis obtained in the fifth step of the example in the KOH seawater solution as the working electrode is 1.741V.
FIG. 19 is an i-t stable cycle curve of the wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis as a working electrode in a mixed solution of KOH and NaCl obtained in the fifth step of the example, wherein 1 is cycle 10h, 2 is cycle 20h, and 3 is cycle 30 h.
As can be seen from FIG. 19, the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis obtained in the fifth step of the example can be obtained at a current density of 100mA cm-2And 500mA · cm-2The time reaches 30h and slightly attenuates. The super-strong circulation stability of the wood aerogel has important significance in the full-hydrolysis of alkaline seawater to produce oxygen and hydrogen.

Claims (10)

1. A preparation method of wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis is characterized in that the preparation method of the wood aerogel for producing oxygen and hydrogen by alkaline seawater electrolysis is completed according to the following steps:
firstly, removing lignin and hemicellulose of natural porous wood, then washing, and finally freeze-drying to obtain wood aerogel with lignin and hemicellulose removed;
secondly, wood with lignin and hemicellulose removedImmersion of aerogels in NaBH4Activating in the mixed solution of NaOH to obtain activated wood aerogel;
thirdly, immersing the activated wood aerogel into a plating solution for plating, taking out the wood aerogel and then drying the wood aerogel in vacuum to obtain the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy;
the plating solution in the third step is prepared from NiSO4·6H2O、Na2MoO4.2H2O、NaH2PO2·H2O、CH3COONa、C6H5Na3O7·2H2O、NH3·H2O and water;
fourthly, putting the wood aerogel loaded with the nickel-molybdenum-phosphorus alloy into Fe (NO)3)3·9H2O and Na2S2O3·5H2Etching and activating in the O mixed solution to obtain sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel;
and fifthly, carrying out vacuum drying on the sulfur-phosphorus co-doped nickel-molybdenum-iron hydroxide/wood aerogel to obtain the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater.
2. The method for preparing the wood aerogel for producing oxygen and hydrogen by the electrolysis of alkaline seawater according to claim 1, wherein the method for removing lignin and hemicellulose from the natural porous wood in the first step comprises the following steps: firstly, immersing natural porous wood into NaOH and Na with the temperature of 90-100 DEG C2SO3The mixed solution is immersed in NaOH solution with the temperature of 70-80 ℃ for 6-8H, and finally immersed in H with the temperature of 40-60 DEG C2O2The solution is added for 1 to 3 hours.
3. The method for preparing wood aerogel for producing hydrogen and oxygen by electrolysis of alkaline seawater as claimed in claim 2, wherein NaOH and Na are used in step one2SO3The concentration of NaOH in the mixed solution is 80 g/L-100 g/L, Na2SO3The concentration of (A) is 40 g/L-50 g/L; the mass fraction of the NaOH solutionThe number is 5% -8%; said H2O2The concentration of the solution is 65 g/L-85 g/L.
4. The method for preparing wood aerogel for producing hydrogen and oxygen by electrolysis of alkaline seawater according to claim 1 or 2, wherein the natural porous wood in the first step is balsa wood with the size of 2.0cm x 0.2 cm.
5. The preparation method of the wood aerogel for producing oxygen and hydrogen by the electrolysis of alkaline seawater according to claim 1, wherein in the first step, the lignin and hemicellulose of the natural porous wood are removed, then deionized water is used for washing for 3 to 5 times, and finally the wood aerogel is freeze-dried at-55 to-60 ℃ for 40 to 48 hours.
6. The method for preparing wood aerogel for producing hydrogen and oxygen by alkaline seawater electrolysis according to claim 1 or 5, wherein the NaBH in the step two is4The preparation method of the mixed solution of NaOH comprises the following steps: 1.25g of NaBH4Dissolving the NaBH into 250mL of NaOH solution with the concentration of 2g/L to obtain NaBH4Mixed solution of NaOH; the activation time in the step two is 10 min-20 min.
7. The method for preparing wood aerogel for producing oxygen and hydrogen by electrolysis of alkaline seawater according to claim 6, wherein NiSO is in the plating solution in the third step4·6H2The concentration of O is 20 g/L-30 g/L, Na2MoO4.2H2The concentration of O is 1 g/L-2 g/L, NaH2PO2·H2The concentration of O is 20 g/L-25 g/L, CH3COONa concentration of 0.10-0.15 g/L, C6H5Na3O7·2H2O concentration of 25-30 g/L, NH3·H2The concentration of O is 50 g/L-65 g/L; the temperature of the plating solution in the third step is 60-75 ℃; the plating time is 0.5 h-1 h; the temperature of the vacuum drying in the third step is 40-60 ℃, and the time of the vacuum drying isIs 8-12 h.
8. The method for preparing wood aerogel for producing oxygen and hydrogen by electrolysis of alkaline seawater as claimed in claim 7, wherein Fe (NO) is used in step four3)3·9H2O and Na2S2O3·5H2The preparation method of the O mixed solution comprises the following steps: 0.35g of Fe (NO)3)3·9H2O and 0.05g of Na2S2O3·5H2Dissolving O in 10mL deionized water to obtain Fe (NO)3)3·9H2O and Na2S2O3·5H2And O, mixing the solution.
9. The method for preparing the wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater as claimed in claim 8, wherein the etching activation time in the fourth step is 2-10 min; and the temperature of the vacuum drying in the step five is 40-60 ℃, and the time of the vacuum drying is 8-12 h.
10. Use of the wood aerogel for the production of hydrogen and oxygen by alkaline seawater electrolysis prepared by the preparation method according to claim 1 or 9, wherein the wood aerogel for the production of hydrogen and oxygen by alkaline seawater electrolysis is used for the production of hydrogen and oxygen by total electrolysis in alkaline seawater.
CN202110299954.7A 2021-03-19 2021-03-19 Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater Active CN113046776B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110299954.7A CN113046776B (en) 2021-03-19 2021-03-19 Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110299954.7A CN113046776B (en) 2021-03-19 2021-03-19 Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater

Publications (2)

Publication Number Publication Date
CN113046776A CN113046776A (en) 2021-06-29
CN113046776B true CN113046776B (en) 2022-02-11

Family

ID=76513912

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110299954.7A Active CN113046776B (en) 2021-03-19 2021-03-19 Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater

Country Status (1)

Country Link
CN (1) CN113046776B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110172688A (en) * 2019-06-25 2019-08-27 青岛大学 It is a kind of for being electrolysed the preparation method and application of the derivation function hole timber of aquatic products hydrogen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110172688A (en) * 2019-06-25 2019-08-27 青岛大学 It is a kind of for being electrolysed the preparation method and application of the derivation function hole timber of aquatic products hydrogen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Hierarchical NiMo Phosphide Nanosheets Strongly Anchored on Carbon Nanotubes as Robust Electrocatalysts for Overall Water Splitting;Hui Xu et. al.;《ACS Appl. Mater. Interfaces》;20180806;第10卷;第29647-29655页 *
Well-aligned Fe-incorporated Ni-Mo-P nanoarray for highly efficeint overall water splitting in alkaline media;김대규;《Seoul National University Library》;20190831;第1页 *

Also Published As

Publication number Publication date
CN113046776A (en) 2021-06-29

Similar Documents

Publication Publication Date Title
Ye et al. A three-dimensional nickel–chromium layered double hydroxide micro/nanosheet array as an efficient and stable bifunctional electrocatalyst for overall water splitting
Li et al. An electrochemically neutralized energy-assisted low-cost acid-alkaline electrolyzer for energy-saving electrolysis hydrogen generation
Shrestha et al. Cu–Fe–NH 2 based metal–organic framework nanosheets via drop-casting for highly efficient oxygen evolution catalysts durable at ultrahigh currents
Wang et al. MoP@ NiCo-LDH on nickel foam as bifunctional electrocatalyst for high efficiency water and urea–water electrolysis
CN109234755B (en) Layered double-metal hydroxide composite structure electrocatalyst and preparation method thereof
Gao et al. Facile electrochemical preparation of self-supported porous Ni–Mo alloy microsphere films as efficient bifunctional electrocatalysts for water splitting
Wang et al. Ni 2 P–CoP hybrid nanosheet arrays supported on carbon cloth as an efficient flexible cathode for hydrogen evolution
Lei et al. Metal-free bifunctional carbon electrocatalysts derived from zeolitic imidazolate frameworks for efficient water splitting
Zhong et al. Facile and fast fabrication of iron-phosphate supported on nickel foam as a highly efficient and stable oxygen evolution catalyst
Liu et al. Competent overall water-splitting electrocatalysts derived from ZIF-67 grown on carbon cloth
Wang et al. Electron-transfer enhanced MoO 2-Ni heterostructures as a highly efficient pH-universal catalyst for hydrogen evolution
KR102298298B1 (en) Bismuth-Based Chloride-Storage Electrode
Li et al. Self-ZIF template-directed synthesis of a CoS nanoflake array as a Janus electrocatalyst for overall water splitting
Wang et al. Anodic hydrazine electrooxidation boosted overall water electrolysis by bifunctional porous nickel phosphide nanotubes on nickel foam
Zhao et al. High-efficiency Ni–P catalysts in amorphous and crystalline states for the hydrogen evolution reaction
CN111686743A (en) La/NF hydrogen evolution material and preparation method and application thereof
Lee et al. A self-generated and degradation-resistive cratered stainless steel electrocatalyst for efficient water oxidation in a neutral electrolyte
Pan et al. Bifunctional nickel and copper electrocatalysts for CO 2 reduction and the oxygen evolution reaction
Yu et al. Ultrathin hollow hemisphere-carbon-anchored Ni 3 FeN nanoparticles as nanoreactors facilitating the formation of NiC x with long-term durability for the oxygen evolution reaction
Wang et al. Corrosive engineering assisted in situ construction of an Fe–Ni-based compound for industrial overall water-splitting under large-current density in alkaline freshwater and seawater media
Zhou et al. Synthesis of flower-like nickel–iron–chromium nanostructure compound deposited stainless steel foil as an efficient binder-free electrocatalyst for water splitting
Han et al. Flocculent VS nanoparticle aggregate-modified NiCo 2 S 4 nanograss arrays for electrocatalytic water splitting
Liu et al. Electronic structure engineering on Co-based metal–organic frameworks for concurrent electrocatalytic hydrogen generation and formate electrosynthesis
WO2021195950A1 (en) Preparation method for and use of cobalt oxyhydroxide catalyst
CN113046776B (en) Preparation method and application of wood aerogel for producing oxygen and hydrogen by electrolyzing alkaline seawater

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant