CN111514896A - Fe2O3/C@Co2Preparation method of B catalyst and application of B catalyst in oxygen evolution reaction - Google Patents
Fe2O3/C@Co2Preparation method of B catalyst and application of B catalyst in oxygen evolution reaction Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
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Abstract
Fe2O3/C@Co2Preparation method of B catalyst and application thereof in oxygen evolution reaction, and Fe is prepared by liquid plasma arc discharge method2O3and/C. The chemical reduction method is used for preparing the Fe with the core-shell structure2O3/C@Co2And B, a catalyst. The catalyst sample is washed and dried and then applied to the electrocatalytic oxygen evolution reaction process. The results show that the concentration of the active carbon in the solution is 10 mA/cm2At current density of (3), Fe2O3/C@Co2The overpotential of the B catalyst is only 332mV compared to commercial RuO2The overpotential of the catalyst (365 mV) decreased by 33 mV. In addition, Fe2O3/C@Co2B and RuO2The Tafel slopes of the first and second electrodes are 48 mV/dec and 68mV/dec, respectively, Fe2O3/C@Co2B vs. commercial RuO2Has a smaller Tafel slope, indicating Fe2O3/C@Co2B has faster reaction kinetics. Further, Fe2O3/C@Co2Stability of B and Co2Compared with B, the catalyst is also obviously improved, can stably catalyze water electrolysis for 12 hours without obvious reduction, and has no obvious increase of overpotential after 2000 cycles of CV.
Description
The invention relates to Fe2O3/C@Co2The preparation of B novel boride catalyst and the application thereof in oxygen evolution reaction, belonging to the technical field of catalyst preparation and application.
Background
The hydrogen energy is used as a renewable energy source, has the characteristics of higher energy density, no pollution and rich resources, is widely concerned and has wide application prospect. The hydrogen production by water electrolysis is a novel technology, can convert electric energy into stable chemical energy, and provides a solution for sustainable development. However, in the process of hydrogen production by water electrolysis, the four-electron transfer process of the Oxygen Evolution Reaction (OER) of the anode consumes a large amount of energy, and further development of hydrogen production by water electrolysis is severely limited. Researches show that the activation energy of the reaction can be remarkably reduced by adding the catalyst in the reaction process, and the reaction is promoted to be rapidly and efficiently carried out. The supported catalyst has the characteristics of high activity and high stability, and plays an important role in the process of hydrogen production by water electrolysis. Transition Metal Borides (TMBs) are used as a novel non-noble metal catalyst, have wide raw materials, simple preparation method and excellent catalytic performance, and are widely concerned by researchers.
Borides are limited in their further development due to their poor conductivity and instability. Carbon nanomaterials have high electrical conductivity and large relative surface areas, making them ideal supports for various catalysts. In recent years, the catalytic performance of the composite prepared by loading metal boride on various carbon materials is greatly improved. In the carbon material, Graphene Oxide (GO) has the characteristic of electronegativity capable of adsorbing cations, and graphene oxide is not used for adsorbing cationsIs usually suitable for preparing the carbon-supported boride catalyst by a chemical reduction method, and becomes a carrier carbon material with the highest use frequency. In the process of loading boride on graphene, GO firstly adsorbs metal ions to form M2+/GO, then with NaBH4Reduction of M2+(ii)/GO to obtain TMBs/rGO catalyst. Chen and the like oxidize multi-wall carbon nanotubes (MWCNTs), add hydroxyl and carboxyl on the multi-wall carbon nanotubes (MWCNTs), namely functionalize the MWCNTs (f-MWCNTs), make the MWCNTs carry negative charges, and prepare the bifunctional catalyst Ni by utilizing the characteristic that the f-MWCNTs can electrostatically adsorb cationsxB/f-MWCNTs. Both GO and f-MWCNTs are prepared by loading metal cations on a carbon material by utilizing electrostatic adsorption, and an extremely long and complicated functionalized treatment process needs to be carried out on the carbon material. The preparation process is long, and the process needs concentrated sulfuric acid and potassium permanganate for treatment, so that certain dangerousness exists.
Disclosure of Invention
The invention aims to provide Fe2O3/C@Co2The preparation of the novel boride catalyst B and the application of the novel boride catalyst in oxygen evolution reaction firstly provide a simple and controllable novel boride catalyst preparation method and provide a method for applying the catalyst in the oxygen evolution reaction.
The invention prepares Fe by a liquid plasma arc discharge method2O3and/C. The chemical reduction method is used for preparing the Fe with the core-shell structure2O3/C@Co2And B, a catalyst.
The invention is in ferrous sulfate (FeSO)4) A new carrier carbon material (Fe) is synthesized in one step by adopting a liquid plasma arc discharge method in a solution2O3/C), using chemical reduction with NaBH4Reduction of Co2+And Fe2O3The results of the mixed solution of the/C carrier show that Co is contained2B is coated with Fe2O3Preparing Fe with a core-shell structure on the surface of a/C carrier material2O3/C@Co2And B, a catalyst. Mixing Fe2O3/C@Co2The B catalyst is applied to the electrocatalytic oxygen evolution reaction process, and performance tests show that the B catalyst is 10 mA/cm2At current density of (3), Fe2O3/C@Co2The overpotential of the B catalyst is only 332mV compared to commercial RuO2The overpotential of the catalyst (365 mV) decreased by 33 mV. In addition, Fe2O3/C@Co2B and RuO2The Tafel slopes of the first and second electrodes are 48 mV/dec and 68mV/dec, respectively, Fe2O3/C@Co2B vs. commercial RuO2Has a smaller Tafel slope, indicating Fe2O3/C@Co2B has faster reaction kinetics. Therefore, Fe2O3/C@Co2B shows a specific commercial RuO2Better OER catalytic activity, stability and Co2Compared with B, the catalyst is also obviously improved, can stably catalyze water electrolysis for 12 hours without obvious reduction, and has no obvious increase of overpotential after 2000 cycles of CV.
The invention provides Fe2O3/C@Co2The preparation method of the novel boride catalyst B and the application of the novel boride catalyst in oxygen evolution reaction comprise the following steps:
(1) preparation of Fe2O3C carrier:
in a heat-resistant container, 20 mmol of FeSO4·7H2O was dissolved in deionized water to prepare 1000 mL of 20 mM FeSO4The solution is used as electrolyte; adopting a spectral pure graphite rod as a cathode and an anode, wherein the diameter of the cathode is 28 mm, and the diameter of the anode is 8 mm; the distance between the two graphite rod electrodes is controlled to be about 3cm, and the two electrodes are arranged along the same horizontal line and immersed in the solution for 3-5 cm. Applying current of 60-90A between the two electrodes, and voltage of 20-30V; the arc discharge between the two electrodes can be stably carried out (the distance between the two electrodes is kept to be about 2 mm) by manually adjusting the transmission device. The discharge time is about 3 min, then the power is cut off, the electrolyte is cooled to the room temperature, and the discharge process is repeated for 20 times. The cathode graphite rod is protected in the arc discharge, while the anode graphite rod is evaporated to provide Fe2O3C carbon source for carrier growth, and simultaneously metal cation Fe in salt solution2+Is oxidized into Fe2O3Attached to the surface of carbon material and removed after dischargeRemoving the upper-layer floating matters of the electrolyte, collecting the lower-layer precipitates, washing the precipitates twice with deionized water, then washing twice with absolute ethyl alcohol, and then putting the precipitates into a vacuum drying oven to dry for 6 hours and then collecting samples.
(2) Preparation of Fe2O3/C@Co2B, catalyst:
1 mmol of CoSO4·7H2O is prepared into CoSO with the concentration of 0.1M4·7H2O solution to CoSO4·7H2Adding 30 mg of Fe into the O solution2O3Mixing uniformly and marking as A liquid;
3 mmol of NaBH4Dissolving in 0.1M NaOH solution to obtain 0.3M NaBH4And 0.1M NaOH solution, and marking as solution B;
then, dropwise adding the solution B into the solution A stirred on a magnetic stirrer, continuously stirring for 3 hours after the addition is finished,
finally, washing the generated precipitate twice with deionized water, then washing twice with absolute ethyl alcohol, then placing the precipitate into a vacuum drying oven to be dried for 6 hours, and collecting a sample to obtain Fe2O3/C@Co2And B, a catalyst.
（3）Fe2O3/C@Co2B, preparing a catalytic material modified glassy carbon electrode, namely polishing, ultrasonically cleaning and drying the glassy carbon electrode with the diameter of 3 mm for later use; 4 mg of Fe2O3/C @Co2Adding the catalyst B into 1000 muL of a mixed solution of deionized water and absolute ethyl alcohol (the ratio of the deionized water to the absolute ethyl alcohol is 1: 4), uniformly mixing by ultrasonic for 35 minutes, adding into 0.5% Nafion solution, and continuing to perform ultrasonic for 25 minutes to obtain a uniform ink-shaped catalyst solution. Uniformly coating 1.8 mu L of solution on the polished GCE by using a liquid transfer gun, and naturally drying to obtain Fe2O3/C@Co2B catalyst modified glassy carbon electrode (Fe)2O3/C @Co2B/GCE) for subsequent OER electrocatalytic performance tests.
（4）Fe2O3/C@Co2The application of the catalyst B in the electrocatalytic oxygen evolution reaction:
saturated Calomel Electrode (SCE) is used as a reference electrode, a 6 mm high-purity graphite rod is used as a counter electrode, and Fe2O3/C@ Co2B/GCE is used as a working electrode to form a three-electrode system. Preparation of Fe by Linear sweep voltammetry2O3/C@Co2B catalyst is used for electrochemical oxygen evolution performance test, and commercial RuO is selected2As a comparative test.
The LSV-Linear Sweep Voltammetry technology is used for testing the Linear Sweep Voltammetry, the electrolyte is a 1M KOH solution, the scanning range is 1.066-1.8V vs RHE, and the scanning rate is 5 mV/s. And further converting the LSV curve into a Tafel slope curve through a Tafel formula to obtain an oxygen evolution kinetic parameter.
(5) Stability testing of the catalyst:
in order to investigate whether the catalyst of the present invention has long-term stable catalytic activity, the prepared catalyst was subjected to stability evaluation using two test methods, cyclic voltammetry and chronoamperometry, on the catalyst in a 1M KOH solution.
In the method, in the step (1), the current applied between the two electrodes in the experimental process is 60-90A.
The method, step (2), wherein NaBH is added4The solvent of the solution is 0.1M NaOH solution, and the solution B is added dropwise into the solution A stirred on a magnetic stirrer, and the magnetic stirring is continued for 3 hours after the addition is finished.
In the method, in the step (3), the ratio of the deionized water to the absolute ethyl alcohol is 1: 4.
fe prepared by the above process steps2O3/C@Co2And B, grinding the collected product by using a mortar, ultrasonically dispersing a trace sample in an absolute ethanol solution, dripping the uniformly dispersed suspension on a micro-grid copper net, drying, and observing and characterizing the suspension by using a JEOL-2010 high-resolution transmission electron microscope (the accelerating voltage is 200 kV, the dot resolution is 0.19 nm, and the lattice resolution is 0.14 nm), wherein the appearance of the catalyst is a sheet structure, and the catalyst consists of five elements of Co, Fe, B, O and C and is uniformly distributed. In addition, catalysisThe agent is an obvious core-shell coating structure, and the core (Fe)2O3/C) substances (Co) with a lamellar structure growing on the outside2B) In that respect Through detection, the Co2B@Fe2O3the/C catalyst shows excellent catalytic activity in the electrocatalytic oxygen evolution reaction and has wide application range.
The invention has the beneficial effects that:
（1）Fe2O3/C@Co2the preparation process of the catalyst B has simple and controllable steps, short preparation time and Co2B is coated on the core Fe2O3The structure is relatively stable at the outer side of C;
(2) using Fe2O3the/C novel nano material can be used as a carrier to improve Co2The specific surface area of B, thereby improving the utilization rate;
(3) in Fe2O3Under the action of a novel support of/C, Co2The dispersity of B is greatly improved, and Co is greatly reduced due to the existence of the carrier2B, aggregation;
(4) novel Fe prepared by experiment2O3/C@Co2The catalyst B is 10 mA/cm in the electrocatalytic oxygen evolution reaction process2Has an overpotential of only 332mV compared to commercial RuO2The overpotential of the catalyst (365 mV) decreased by 33 mV. In addition, Fe2O3/C@Co2The Tafel slope of B was 48 mV/dec vs commercial RuO2(68 mV/dec) had a smaller Tafel slope. These all show that Co2B is loaded on a carrier Fe2O3after/C, show a comparable commercial RuO2More excellent electrocatalytic performance.
（5）Fe2O3/C@Co2B has faster reaction kinetics. Further, Fe2O3/C@Co2Stability of B and Co2Compared with B, the catalyst is also obviously improved, can stably catalyze water electrolysis for 12 hours without obvious reduction, and has no obvious increase of overpotential after 2000 cycles of CV.
Drawings
FIG. 1 is a drawing of the present inventionFe2O3TEM image of the/C support.
FIG. 2 is Fe of the present invention2O3/C@Co2TEM image of B catalyst.
FIG. 3 is Fe of the present invention2O3/C@Co2LSV polarization curve diagram of the B catalyst used for electrocatalytic oxygen evolution reaction.
FIG. 4 is Fe of the present invention2O3/C@Co2The catalyst B is used for a Tafel slope diagram of electrocatalytic oxygen evolution reaction.
FIG. 5 is Fe of the present invention2O3/C@Co2And the catalyst B is used for a stability test chart of the electrocatalytic oxygen evolution reaction.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
(1) preparation of Fe2O3C carrier:
in a heat-resistant container, 20 mmol of FeSO4Prepared to 1000 mL of 20 mM FeSO dissolved in deionized water4The solution is used as electrolyte;
adopting a spectral pure graphite rod as a cathode and an anode, wherein the diameter of the cathode is 28 mm, and the diameter of the anode is 8 mm; the distance between the two graphite rod electrodes is controlled to be 3cm, and the two electrodes are arranged along the same horizontal line and immersed in the solution for 3 cm.
Applying a current of 60A between the two electrodes, and the voltage is 23V; the arc was stabilized during discharge by manually adjusting the electrodes to maintain a 2 mm separation. The discharge time is 3 min each time, then the power supply is cut off, the electrolyte is cooled to the room temperature, and the discharge process is repeated for 20 times. The cathode graphite rod is protected in the arc discharge, while the anode graphite rod is evaporated to provide Fe2O3C carbon source for carrier growth, and simultaneously metal cation Fe in salt solution2+Is oxidized into Fe2O3Attaching to the surface of carbon material, removing floating substances on the upper layer of electrolyte after discharging, collecting the precipitate on the lower layer, repeating the above washing process twice, drying in vacuum drying oven for 6 hr, and collectingAnd collecting samples.
(2) Preparation of Fe2O3/C@Co2B, catalyst:
1 mmol of CoSO4·7H2O is prepared into CoSO with the concentration of 0.1M4·7H2O solution to CoSO4·7H 230 mg of carrier carbon material Fe was added to the O solution2O3and/C is mixed uniformly and marked as solution A.
3 mmol of NaBH4Dissolving in 0.1M NaOH solution to obtain 0.3M NaBH4And 0.1M NaOH solution, as solution B.
Then, the solution B was added dropwise to the solution A being stirred on a magnetic stirrer, and stirring was continued for 3 hours after the completion of the addition.
Finally, washing the generated precipitate twice with deionized water, then washing twice with absolute ethyl alcohol, putting the precipitate into a vacuum drying oven to dry for 6 hours, and collecting a sample to obtain Fe2O3/C@Co2And B, a catalyst.
（3）Fe2O3/C@Co2Preparation of B catalytic material modified glassy carbon electrode
Polishing a Glassy Carbon Electrode (GCE) with the diameter of 3 mm, ultrasonically cleaning and drying for later use; 4 mg of Co2B@Fe2O3Adding the/C catalyst into 1000 muL of a mixed solution of deionized water and absolute ethyl alcohol (the ratio of the deionized water to the absolute ethyl alcohol is 1: 4), uniformly mixing by ultrasonic for 35 minutes, adding into a 0.5% Nafion solution, and continuing to perform ultrasonic for 25 minutes to obtain a uniform ink-shaped catalyst solution.
Uniformly coating 1.8 mu L of catalyst solution on the polished GCE by using a liquid transfer gun, and naturally drying to obtain Fe2O3/C@Co2B catalyst modified glassy carbon electrode (Fe)2O3/C @Co2B/GCE) for subsequent OER electrocatalytic performance tests.
（4）Fe2O3/C@Co2The application of the catalyst B in the electrocatalytic oxygen evolution reaction:
saturated Calomel Electrode (SCE) as reference electrode, 6 mm high-purity graphite rodAs counter electrode, Fe2O3/C@ Co2B/GCE is used as a working electrode to form a three-electrode system.
Preparation of Fe by Linear sweep voltammetry2O3/C@Co2B catalyst is used for electrochemical oxygen evolution performance test, and commercial RuO is selected2As a comparative test.
The LSV-Linear Sweep Voltammetry technology is used for testing the Linear Sweep Voltammetry, the electrolyte is a 1M KOH solution, the scanning range is 1.066-1.8V vs RHE, and the scanning rate is 5 mV/s.
And further converting the LSV curve into a Tafel slope curve through a Tafel formula to obtain an oxygen evolution kinetic parameter.
(5) Stability testing of the catalyst:
in order to investigate whether the catalyst of the present invention has long-term stable catalytic activity, the prepared catalyst was subjected to stability evaluation using two test methods, cyclic voltammetry and chronoamperometry, on the catalyst in a 1M KOH solution.
Fe obtained in example 12O3/C@Co2B catalyst at 10 mA/cm2The overpotential under the current density is only 332mV, the Tafel slope is 48 mV/dec, the catalyst can stably catalyze water electrolysis for 12 h without obvious reduction, and the overpotential is not obviously increased after 2000 cycles of CV.
Example 2:
(1) preparation of Fe2O3C carrier:
in a heat-resistant container, 20 mmol of FeSO4Prepared to 1000 mL of 20 mM FeSO dissolved in deionized water4The solution is used as electrolyte;
adopting a spectral pure graphite rod as a cathode and an anode, wherein the diameter of the cathode is 28 mm, and the diameter of the anode is 8 mm; the distance between the two graphite rod electrodes is controlled to be 3cm, and the two electrodes are arranged along the same horizontal line and immersed in the solution for 3 cm.
Applying a current of 80A between the two electrodes, and the voltage is 28V; the two electrodes were kept at a distance of 2 mm by manual adjustment to ensure electricity during dischargeAnd (4) stabilizing the arc. The discharge time is 3 min each time, then the power supply is cut off, the electrolyte is cooled to the room temperature, and the discharge process is repeated for 20 times. The cathode graphite rod is protected in the arc discharge, while the anode graphite rod is evaporated to provide Fe2O3C carbon source for carrier growth, and simultaneously metal cation Fe in salt solution2+Is oxidized into Fe2O3Attaching to the surface of a carbon material, removing the floating substances on the upper layer of the electrolyte after discharging, collecting the lower-layer precipitates, washing the precipitates twice with deionized water, then washing twice with absolute ethyl alcohol, then placing the precipitates into a vacuum drying oven for drying for 6 hours, and collecting samples.
Fe prepared in example 22O3The specific surface area of the/C support is smaller than that of the support prepared in example 1. Fe obtained in example 2 was added by the method of step 2 of example 12O3Preparation of Fe from/C support2O3/C@Co2B catalyst, in the course of electrocatalytic oxygen evolution reaction, 10 mA/cm2The overpotential at the current density of (a) was 352 mV and the Tafel slope was 53 mV/dec.
Example 3: this example uses the Fe prepared in example 12O3a/C support material;
1 mmol of CoSO4·7H2O is prepared into CoSO with the concentration of 0.01M4·7H2O solution to CoSO4·7H2Adding 30 mg of Fe into the O solution2O3The carrier material/C was mixed homogeneously and recorded as solution A.
3 mmol of NaBH4Dissolving in 0.1M NaOH solution to obtain 0.3M NaBH4And 0.1M NaOH solution, as solution B.
Then, the solution B was added dropwise to the solution A being stirred on a magnetic stirrer, and stirring was continued for 3 hours after the completion of the addition.
Finally, washing the generated precipitate with deionized water and absolute ethyl alcohol respectively twice in sequence, putting the precipitate into a vacuum drying oven to be dried for 6 hours, and collecting a sample to obtain Fe2O3/C@Co2And B, a catalyst.
Fe prepared in example 32O3/C@Co2B catalyst is microThe appearance is a flocculent structure, and the catalyst is 10 mA/cm in the electrocatalytic oxygen evolution reaction process2The overpotential at the current density of (a) was 368 mV and the Tafel slope was 69 mV/dec.
Claims (3)
1.Fe2O3/C@Co2The preparation method of the catalyst B is characterized by comprising the following steps: fe2O3/C@Co2The catalyst B has a core-shell structure, and the preparation method comprises the following steps:
(1) preparation of Fe2O3C carrier:
preparing an electrolyte: in a heat-resistant container, 20 mmol of FeSO4·7H2O was dissolved in 1000 mL of deionized water to prepare 20 mM FeSO4The solution is used as electrolyte;
discharging: adopting a spectral pure graphite rod as a cathode electrode and an anode electrode, wherein the diameter of the cathode electrode is 28 mm, and the diameter of the anode electrode is 8 mm; the distance between the two electrodes is 3cm, and the two electrodes are arranged along the same horizontal line and immersed under the liquid level of the electrolyte by 3-5 cm; applying current of 60-90A between the two electrodes, and voltage of 20-30V; manually adjusting to enable the distance between the two electrodes to be 2 mm, discharging for 3 min each time, and then cutting off a power supply until the electrolyte is cooled to room temperature; repeating the discharging process for 20 times;
sample preparation: the cathode graphite rod is protected in the arc discharge, while the anode graphite rod is evaporated to provide Fe2O3C carbon source for carrier growth, and simultaneously metal cation Fe in salt solution2+Is oxidized into Fe2O3Attaching to the surface of carbon material, removing the floating matter on the upper layer of electrolyte after discharging, collecting the precipitate on the lower layer, washing the precipitate twice with deionized water, then washing twice with absolute ethyl alcohol, drying in a vacuum drying oven for 6 h, and collecting Fe as sample2O3a/C carrier;
(2) preparation of Fe2O3/C@Co2B, catalyst:
1 mmol of CoSO4·7H2O is prepared into CoSO with the concentration of 0.1M4·7H2O solution to CoSO4·7H2Adding 30 mg of the solution O Fe2O3The carrier/C is mixed evenly and is marked as solution A;
3 mmol of NaBH4Dissolving in 0.1M NaOH solution to obtain 0.3M NaBH4And 0.1M NaOH solution, and marking as solution B;
then, dropwise adding the solution B into the solution A which is stirred on a magnetic stirrer, and continuously stirring for 3 hours after the addition is finished; finally, washing the generated precipitate twice with deionized water, then washing twice with absolute ethyl alcohol, then placing the precipitate into a vacuum drying oven to be dried for 6 hours, and collecting a sample to obtain Fe2O3/C@Co2And B, a catalyst.
2.Fe2O3/C@Co2The preparation method of the catalyst modified glassy carbon electrode is characterized by comprising the following steps:
polishing a glassy carbon electrode with the diameter of 3 mm, ultrasonically cleaning and drying for later use;
mixing 4 mg of Fe obtained in claim 12O3/C @Co2Adding the catalyst B into a mixed solution of 1000 muL of deionized water and absolute ethyl alcohol, wherein the ratio of the deionized water to the absolute ethyl alcohol is 1: 4, uniformly mixing by ultrasonic treatment for 35 minutes, adding the mixture into 0.5 percent Nafion solution, and continuing ultrasonic treatment for 25 minutes to obtain uniform ink-shaped catalyst solution;
uniformly coating 1.8 mu L of catalyst solution on the polished glassy carbon electrode by using a liquid transfer gun, and naturally drying to obtain Fe2O3/C@Co2B catalyst modified glassy carbon electrode Fe2O3/C @Co2B /GCE。
3. Fe2O3/C@Co2The application of the catalyst B in the electrocatalytic oxygen evolution reaction: it is characterized in that
Fe obtained in claim 2, using a saturated calomel electrode as a reference electrode and a 6 mm high purity graphite rod as a counter electrode2O3/C@ Co2B/GCE as working electrode, by linear sweep voltammetry on Fe prepared in claim 12O3/C@Co2B catalyst is used for carrying out electrochemical oxygen evolution performance testWhile selecting commercial RuO2As a comparative test;
the Linear Sweep Voltammetry test uses an LSV-Linear Sweep Voltammetry technology, the electrolyte is a 1M KOH solution, the scanning range is 1.066-1.8V vs RHE, the scanning speed is 5 mV/s, and an LSV curve is converted into a Tafel slope curve through a Tafel formula to obtain an oxygen evolution kinetic parameter.
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| JP2017121778A (en) * | 2016-01-08 | 2017-07-13 | 新日鐵住金株式会社 | Coated steel sheet |
| CN108866563A (en) * | 2018-07-24 | 2018-11-23 | 天津大学 | A kind of pucherite film photo cathode, preparation method and the purposes of the modification of boronation cobalt |
| WO2020005269A1 (en) * | 2018-06-28 | 2020-01-02 | Board Of Trustees Of The University Of Arkansas | Water purification compositions and the method of producing the same |
| US20200009536A1 (en) * | 2017-02-17 | 2020-01-09 | Waseda University | Manufacturing methods for supported catalysts and carbon nanostructures |
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| JP2017121778A (en) * | 2016-01-08 | 2017-07-13 | 新日鐵住金株式会社 | Coated steel sheet |
| US20200009536A1 (en) * | 2017-02-17 | 2020-01-09 | Waseda University | Manufacturing methods for supported catalysts and carbon nanostructures |
| WO2020005269A1 (en) * | 2018-06-28 | 2020-01-02 | Board Of Trustees Of The University Of Arkansas | Water purification compositions and the method of producing the same |
| CN108866563A (en) * | 2018-07-24 | 2018-11-23 | 天津大学 | A kind of pucherite film photo cathode, preparation method and the purposes of the modification of boronation cobalt |
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