CN108910962A - A kind of ternary CoFeCr hydrotalcite nano stick and the preparation method and application thereof - Google Patents
A kind of ternary CoFeCr hydrotalcite nano stick and the preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a kind of ternary CoFeCr hydrotalcite nano sticks and the preparation method and application thereof, and cobalt nitrate, ferric nitrate, chromic nitrate, urea, ammonium fluoride are mixed in water, and precursor mixed solution is made；Substrate is placed in the precursor mixed solution, and the substrate is transferred in autoclave together with the precursor mixed solution, is then reacted 360~600 minutes at 110~130 DEG C, so that ternary CoFeCr hydrotalcite nano stick be made in substrate.The ternary CoFeCr hydrotalcite nano stick is together with substrate directly as the working electrode of electrochemical decomposition water.The transition metal oxide of the present invention not only than in the prior art has a preferably electrolysis elutriation oxygen performance, and preparation process it is simple, rapidly and efficiently, production energy consumption is low, production cost is low, environment friendly and pollution-free, be suitble to large-scale industrial production.
Description
Technical field
The present invention relates to transition metal oxide nano-material field more particularly to a kind of ternary CoFeCr hydrotalcite nanos
Stick and the preparation method and application thereof.
Background technique
The excessive use of fossil fuel will cause air pollution, aggravate global warming, thus need to find cleaning, can
Lasting new energy carrys out substitute fossil fuels.Hydrogen Energy has many advantages, such as abundance, fuel value height, green non-pollution, therefore hydrogen
It can be expected to as following important energy source.In the application of Hydrogen Energy, hydrogen storage is premise, and hydrogen manufacturing is crucial.Water electrolysis hydrogen production is with it
Product purity height, simple process, it is environment friendly and pollution-free the advantages that become most promising hydrogen manufacturing means.In electrolysis hydrogen producing process
In, the oxygen evolution reaction (OER) of water splitting processes can be related to four electron reactions, and dynamic process is slow, and there are biggish excessively electric
Gesture seriously hinders the entire efficiency for producing hydrogen process, therefore researches and develops a kind of electricity cheap and easy to get, catalytic performance is high, stability is strong
Solving elutriation VPO catalysts becomes the main bugbear of water electrolysis hydrogen production.
Currently, most efficient electrolysis water oxygen-separating catalyst is the precious metal chemical complexs such as ruthenium, iridium, but since these noble metals store up
Measure that limited, cost is excessively high, therefore which has limited their application and popularizations.In recent years, it has been found that transition metal oxide, mistake
Cross the transistion metal compounds such as metal selenide, transient metal sulfide, transition metal phosphide can be used as have preferably urge
Change active electrolysis water oxygen-separating catalyst.In the prior art, transition metal oxide is in terms of electrolysis water oxygen-separating catalyst
Catalytic activity and production cost are with the obvious advantage better than other transistion metal compounds, but the catalysis of existing transition metal oxide is living
Property it is still lower, electrolysis elutriation oxygen performance is still poor, and that there are overpotential is high, stability is poor, preparation process is complicated, produces
The technical problems such as low efficiency, higher cost, therefore be used to produce reality using transition metal oxide as electrolysis water oxygen-separating catalyst
Trample that there is also considerable restraints.
Summary of the invention
In order to solve catalysis existing for the transition metal oxide used in the prior art as electrolysis water oxygen-separating catalyst
Activity is still lower, electrolysis elutriation oxygen performance is still poor, overpotential is high, stability is poor, preparation process is complicated, production efficiency
The technical problems such as low, higher cost, the present invention provides a kind of ternary CoFeCr hydrotalcite nano stick and preparation method thereof with answer
With not only transition metal oxide than in the prior art has preferably electrolysis elutriation oxygen performance, but also overpotential is low, stablizes
Property it is good, preparation process is simple, rapidly and efficiently, production energy consumption is low, production cost is low, environment friendly and pollution-free, be suitble to heavy industrialization
Production.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of preparation method of ternary CoFeCr hydrotalcite nano stick, includes the following steps：
Step A, cobalt nitrate, ferric nitrate, chromic nitrate, urea, ammonium fluoride are mixed in water, makes solution after mixing
The concentration of middle cobalt nitrate is 40~80 mM/ls, the concentration of ferric nitrate is 8~20 mM/ls, the concentration of chromic nitrate is 8
~20 mM/ls, the concentration of urea be 0.5~0.8 mol/L, the concentration of ammonium fluoride is 0.2~0.3 mol/L, thus
Precursor mixed solution is made；
Step B, substrate is placed in the precursor mixed solution, and by the substrate and the precursor mixed solution
It is transferred in autoclave, is then reacted 360~600 minutes at 110~130 DEG C together, so that ternary be made in substrate
CoFeCr hydrotalcite nano stick.
Preferably, the substrate uses nickel foam, foam copper, carbon cloth or titanium foil.
Preferably, the ternary CoFeCr hydrotalcite nano stick is together with substrate directly as electrochemical decomposition water
Working electrode.
A kind of ternary CoFeCr hydrotalcite nano stick, using the preparation method of above-mentioned ternary CoFeCr hydrotalcite nano stick
It is prepared.Preferably, the ternary CoFeCr hydrotalcite nano stick is nanometer rods of the homoepitaxial in substrate.
A kind of application of ternary CoFeCr hydrotalcite nano stick is used for using above-mentioned ternary CoFeCr hydrotalcite nano stick
Electrochemical decomposition water.
A kind of application of ternary CoFeCr hydrotalcite nano stick, by the preparation side of above-mentioned ternary CoFeCr hydrotalcite nano stick
Ternary CoFeCr hydrotalcite nano stick is together with substrate directly as the working electrode of electrochemical decomposition water obtained by method.
As seen from the above technical solution provided by the invention, the present invention is by being 40~80 mmoles to nitric acid cobalt concentration
You/liter, iron nitrate concentration be 8~20 mM/ls, nitric acid chromium concn is 8~20 mM/ls, urea concentration be 0.5~
0.8 mol/L, the precursor mixed solution that fluorination ammonium concentration is 0.2~0.3 mol/L carry out hydro-thermal process, and control reaction
Temperature is 110~130 DEG C, the reaction time is 360~600 minutes, thus simply, fast and efficiently prepare catalytic activity it is high,
Overpotential is low, low-cost ternary CoFeCr hydrotalcite nano stick.Ternary CoFeCr hydrotalcite nano stick can be with substrate
Together directly as the working electrode of electrochemical decomposition water.The transition metal oxide of the present invention not only than in the prior art has
Preferably electrolysis elutriation oxygen performance, and overpotential is low, stability is good, preparation process is simple, rapidly and efficiently, production energy consumption it is low,
Production cost is low, environment friendly and pollution-free, is suitble to large-scale industrial production.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is in foam nickel base obtained by substrate used in the embodiment of the present invention 1 and the embodiment of the present invention 1
The X ray diffracting spectrum and field emission scanning electron microscope photo of ternary CoFeCr hydrotalcite nano stick.
Fig. 2 is the element of the ternary CoFeCr hydrotalcite nano stick in foam nickel base obtained by the embodiment of the present invention 1
Analyze energy spectrum diagram.
Fig. 3 is the Elemental redistribution of ternary CoFeCr hydrotalcite nano stick in foam nickel base obtained by the embodiment of the present invention 1
Figure.
Fig. 4 is substrate, existing skill used in the embodiment of the present invention 1 in the KOH electrolyte environment that concentration is 1mol/L
Pure Co hydrotalcite nano stick, binary CoCr hydrotalcite nano stick in the prior art, binary CoFe in the prior art in art
The electricity of ternary CoFeCr hydrotalcite nano stick in foam nickel base obtained by hydrotalcite nano stick and the embodiment of the present invention 1
Solve water catalytic performance comparison diagram.
Fig. 5 is in foam nickel base obtained by the embodiment of the present invention 1 in the KOH electrolyte environment that concentration is 1mol/L
Ternary CoFeCr hydrotalcite nano stick after stability test x-ray diffractogram of powder spectrum and Flied emission scanning electron microscopy
Mirror photo.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
Ternary CoFeCr hydrotalcite nano stick provided by the present invention and the preparation method and application thereof is carried out below detailed
Description.The content being not described in detail in the embodiment of the present invention belongs to the prior art well known to professional and technical personnel in the field.
A kind of ternary CoFeCr hydrotalcite nano stick, preparation method includes the following steps：
Step A, cobalt nitrate, ferric nitrate, chromic nitrate, urea, ammonium fluoride are mixed in water, makes solution after mixing
The concentration of middle cobalt nitrate is 40~80 mM/ls, the concentration of ferric nitrate is 8~20 mM/ls, the concentration of chromic nitrate is 8
~20 mM/ls, the concentration of urea be 0.5~0.8 mol/L, the concentration of ammonium fluoride is 0.2~0.3 mol/L, thus
Precursor mixed solution is made.
Step B, substrate is placed in the precursor mixed solution, and by the substrate and the precursor mixed solution
It is transferred in autoclave, is then reacted 360~600 minutes at 110~130 DEG C together, so that ternary be made in substrate
CoFeCr hydrotalcite nano stick (i.e. CoFeCr-LDHs nanometer rods).
Wherein, nickel foam (Nickel Foam, NF), foam copper, carbon cloth or titanium foil can be used in the substrate, but in reality
Preferably with nickel foam in, such as：The nickel foam having a size of 1 × 4cm can be used.
Compared with prior art, ternary CoFeCr hydrotalcite nano stick provided by the present invention and preparation method thereof at least has
It has the advantage that：
(1) in the prior art, the transition metal oxide used as electrolysis water oxygen-separating catalyst is unitary transition mostly
Metal oxide or transiton metal binary oxides, that there are catalytic activity is low for these transition metal oxides, overpotential is high, stablizes
The technical problems such as property difference.And ternary CoFeCr hydrotalcite nano stick provided by the present invention is nanometer of the homoepitaxial in substrate
Stick, and pass through chemical modification (chemical composition for changing transition metal oxide) and structurally-modified (i.e. change oxo transition metal
The physical properties such as electric conductivity, hydrophily, the surface roughness of compound nanostructure) it couples to increase the reaction active site of catalyst
Point promotes the catalytic performance of transition metal oxide, so that ternary CoFeCr hydrotalcite nano stick provided by the present invention
There is the electrolysis elutriation oxygen catalytic activity for being apparently higher than existing transition metal oxide in alkaline electrolyte environment.
(2) ternary CoFeCr hydrotalcite nano stick provided by the present invention can be together with substrate directly as electrochemistry
The working electrode for decomposing water, without carrying out any other processing.
(3) preparation method of ternary CoFeCr hydrotalcite nano stick provided by the present invention only needs laboratory commonly common
Equipment, is not required to special equipment, and technical process is simple to operation.
(4) abundant raw material, nothing used in the preparation method of ternary CoFeCr hydrotalcite nano stick provided by the present invention
It pollutes and cheap and easy to get, therefore is very suitable for a large amount of, inexpensive, large-scale production, this is suitble to future work in terms of the energy, hydrogen manufacturing
Industry large-scale application.
To sum up, the transition metal oxide of the embodiment of the present invention not only than in the prior art has better electrolysis water
Analyse oxygen performance, and overpotential is low, stability is good, preparation process is simple, rapidly and efficiently, production energy consumption is low, production cost is low, ring
Protect pollution-free, suitable large-scale industrial production.
In order to more clearly from show technical solution provided by the present invention and generated technical effect, below with tool
The ternary CoFeCr hydrotalcite nano stick and the preparation method and application thereof in the present invention is described in detail in body embodiment.
Embodiment 1
A kind of ternary CoFeCr hydrotalcite nano stick, preparation method include the following steps：
Step a, cobalt nitrate, ferric nitrate, chromic nitrate, urea, ammonium fluoride are mixed in water, makes solution after mixing
Middle nitric acid cobalt concentration is 60 mM/ls, iron nitrate concentration is 10 mM/ls, nitric acid chromium concn is 10 mM/ls, urine
Plain concentration is 0.6 mol/L, fluorination ammonium concentration is 0.25 mol/L, so that precursor mixed solution be made.
Step b, using the nickel foam having a size of 1 × 4cm as substrate, substrate is placed in the precursor mixed solution, and
In the autoclave that the substrate is transferred to 25mL together with the precursor mixed solution, 480 points are then reacted at 120 DEG C
Clock, so that ternary CoFeCr hydrotalcite nano stick be made in foam nickel base.
Specifically, following pattern, ingredient and performance detection are carried out in 1 implementation process of the embodiment of the present invention：
(1) using the ternary CoFeCr water in X-ray diffractometer foam nickel base obtained final to the embodiment of the present invention 1
Talcum nanometer rods carry out ingredient characterization, and using scanning electron microscope respectively to nickel foam used in the embodiment of the present invention 1
Ternary CoFeCr hydrotalcite nano stick in substrate and the final foam nickel base obtained of the embodiment of the present invention 1 carries out pattern sight
It surveys, to obtain X-ray diffraction as shown in Figure 1 (XRD) map and field emission scanning electron microscope (FESEM) photo.Its
In, Fig. 1 a is that the X-ray of the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1 is spread out
Penetrating map, (CoFe-LDHs in figure indicates binary CoFe hydrotalcite nano stick in the prior art, the CoFeCr-LDHs in figure
Indicate the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1), Fig. 1 b is the present invention
The FESEM photo of foam nickel base used in embodiment 1, Fig. 1 c are binary CoFe hydrotalcite nano stick in the prior art
FESEM photo, Fig. 1 d are the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1
FESEM photo.As seen from Figure 1：Ternary CoFeCr hydrotalcite in the final foam nickel base obtained of the embodiment of the present invention 1
Nanometer rods are uniform sequential to be closely grown in foam nickel base.
(2) using the ternary in energy dispersive spectrometer (EDS) foam nickel base obtained final to the embodiment of the present invention 1
CoFeCr hydrotalcite nano stick carries out elemental analysis, to obtain elemental analysis energy spectrum diagram as shown in Figure 2.It can be seen by Fig. 2
Out：Ternary CoFeCr hydrotalcite nano stick in the final obtained foam nickel base of the embodiment of the present invention 1 be by Co, Fe, Cr, C,
Six kinds of element compositions of O and Ni, Ni is from substrate.
(3) Ni-based using element M apping (Element Mapping) foam obtained final to the embodiment of the present invention 1
Ternary CoFeCr hydrotalcite nano stick on bottom carries out elemental analysis, to obtain distribution diagram of element as shown in Figure 3；Wherein,
Fig. 3 a is all elements on the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1
Distribution diagram of element, Fig. 3 b are the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1
The distribution diagram of element of upper Co element, Fig. 3 c are the ternary CoFeCr water in the final foam nickel base obtained of the embodiment of the present invention 1
The distribution diagram of element of Fe element in talcum nanometer rods, Fig. 3 d are three in the final foam nickel base obtained of the embodiment of the present invention 1
The distribution diagram of element of Cr element on first CoFeCr hydrotalcite nano stick, Fig. 3 e are the final nickel foam obtained of the embodiment of the present invention 1
The distribution diagram of element of O element on ternary CoFeCr hydrotalcite nano stick in substrate, Fig. 3 f are that the embodiment of the present invention 1 is finally made
Foam nickel base on ternary CoFeCr hydrotalcite nano stick on C element distribution diagram of element.As seen from Figure 3：Co,
Fe, Cr, O, C, five kinds of elements are evenly distributed in the ternary in the final foam nickel base obtained of the entire embodiment of the present invention 1
On CoFeCr hydrotalcite nano stick.
(4) foam nickel base used in the embodiment of the present invention 1, pure Co hydrotalcite nano in the prior art is respectively adopted
Stick, binary CoCr hydrotalcite nano stick, binary CoFe hydrotalcite nano stick in the prior art and this hair in the prior art
Work of the ternary CoFeCr hydrotalcite nano stick as electrolysis water oxygen evolution reaction in the bright final foam nickel base obtained of embodiment 1
Make electrode, using silver/silver chlorate as reference electrode, using carbon-point as to electrode, carried out in the KOH solution that concentration is 1mol/L
It is electrolysed the test of elutriation oxygen, and (surface sweeping range is 0~1V, sweeps using occasion China 760e electrochemical workstation with linear sweep voltammetry
Speed is 2mV/s) it measures respectively, to obtain electrolysis water catalytic performance comparison diagram as shown in Figure 4.Wherein, Fig. 4 a is this
Foam nickel base used in inventive embodiments 1, pure Co hydrotalcite nano stick in the prior art, binary in the prior art
CoCr hydrotalcite nano stick, binary CoFe hydrotalcite nano stick in the prior art and the embodiment of the present invention 1 are final obtained
The polarization curve of ternary CoFeCr hydrotalcite nano stick in foam nickel base；Fig. 4 b is used in the embodiment of the present invention 1
It is foam nickel base, pure Co hydrotalcite nano stick in the prior art, binary CoCr hydrotalcite nano stick in the prior art, existing
The ternary in the final foam nickel base obtained of binary CoFe hydrotalcite nano stick and the embodiment of the present invention 1 in technology
The Tafel curve figure comparison diagram of CoFeCr hydrotalcite nano stick；Fig. 4 c be the embodiment of the present invention 1 used in foam nickel base,
Pure Co hydrotalcite nano stick in the prior art, binary CoCr hydrotalcite nano stick in the prior art, in the prior art two
Ternary CoFeCr hydrotalcite on first CoFe hydrotalcite nano stick and the final foam nickel base obtained of the embodiment of the present invention 1 is received
Rice stick in current density 10mA/cm-2When overpotential comparison diagram；Fig. 4 d is the final nickel foam obtained of the embodiment of the present invention 1
Ternary CoFeCr hydrotalcite nano stick in substrate is through polarization curve comparison diagram (the inserting in Fig. 4 d before and after 3000 loop tests
Entering figure is that the electric current tested with chronoamperometry changes over time curve graph)；In Fig. 4 a, Fig. 4 b and Fig. 4 c, Bare NF is indicated
Foam nickel base used in the embodiment of the present invention 1, Co-LH/NF indicate pure Co hydrotalcite nano stick in the prior art,
CoCr-LDHs/NF indicates that binary CoCr hydrotalcite nano stick in the prior art, CoFe-LDHs/NF indicate in the prior art
Binary CoFe hydrotalcite nano stick, CoFeCr-LDHs/NF are indicated in the final foam nickel base obtained of the embodiment of the present invention 1
Ternary CoFeCr hydrotalcite nano stick.It can be seen that by Fig. 4 a and Fig. 4 c：In the KOH alkaline solution that concentration is 1mol/L, with
Pure Co hydrotalcite nano stick in the prior art, binary CoCr hydrotalcite nano stick in the prior art, in the prior art two
Foam nickel base used in first CoFe hydrotalcite nano stick and the embodiment of the present invention 1 is compared, and the embodiment of the present invention 1 is finally made
The ternary CoFeCr hydrotalcite nano stick in foam nickel base obtained has minimum overpotential, highest catalytic activity.By scheming
4b can be seen that：Ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1 has most
Small Tafel slope.It can be seen that by Fig. 4 d：After 3000 circulations, the final foam obtained of the embodiment of the present invention 1 is Ni-based
There is no significant changes for the polarization curve of ternary CoFeCr hydrotalcite nano stick on bottom.It can be seen by the insertion figure in Fig. 4 d
Out：It was tested by 20 hours, the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1
Electric current do not occur apparent reduction.Synthesis can be seen that in Fig. 4 a, Fig. 4 b, Fig. 4 c and Fig. 4 d：The embodiment of the present invention 1 is most
Ternary CoFeCr hydrotalcite nano stick in foam nickel base made from end not only has excellent electrolysis elutriation oxygen catalytic activity,
But also it is with good stability.
(5) made to the embodiment of the present invention 1 after stability test in the KOH electrolyte environment that concentration is 1mol/L
The ternary CoFeCr hydrotalcite nano stick in foam nickel base obtained carries out pattern and composition characterization, so as to obtain such as Fig. 5
Shown in after stability test x-ray diffractogram of powder spectrum (XRD) and field emission scanning electron microscope (FESEM) photograph
Piece.As seen from Figure 5：Ternary CoFeCr after stability test, in foam nickel base obtained by the embodiment of the present invention 1
There is no significant changes for the ingredient and pattern of hydrotalcite nano stick, this shows foam nickel base obtained by the embodiment of the present invention 1
On ternary CoFeCr hydrotalcite nano stick have extraordinary structural stability.
Further, the ternary CoFeCr neatly in the final foam nickel base obtained of the embodiment of the present invention 1 is respectively adopted
Work of the common non-precious metal catalyst as electrolysis water oxygen evolution reaction in stone nanometer rods and existing electrolysis elutriation oxygen field
Electrode carries out electrolysis elutriation oxygen performance test, so as to obtain result as shown in table 1 below：
Table 1
| Water electrolysis hydrogen production catalyst | J=10mA cm-2, overpotential (mV) | Electrolyte | |
| The embodiment of the present invention 1 | CoFeCr-LDHs/NF | 238 | 1mol/L KOH |
| Comparative example 1 | CoFe LDH-F | 300 | 1mol/L KOH |
| Comparative example 2 | NiCo LDH | 367 | 1mol/L KOH |
| Comparative example 3 | CoFe LDHs | 346 | 1mol/L KOH |
| Comparative example 4 | HPGC@NiFe | 265 | 1mol/L KOH |
| Comparative example 5 | NiFe-LDH@SWNT | 250 | 1mol/L KOH |
| Comparative example 6 | NaNi0.9Fe0.1O2 | 290 | 1mol/L KOH |
| Comparative example 7 | The hollow prism of NiFe LDH | 280 | 1mol/L KOH |
| Comparative example 8 | Ni0.67Fe0.33/C | 325 | 1mol/L KOH |
| Comparative example 9 | NiMn-LDHs | 350 | 1mol/L KOH |
| Comparative example 10 | Co(OH)(C6H5COO)·H2O | 360 | 1mol/L KOH |
In upper table 1, the working electrode of electrolysis water oxygen evolution reaction is existing electrolysis elutriation oxygen field in comparative example 1~10
In the common non-precious metal catalyst suitable for alkaline electrolyte environment；Comparative example 1 be with《The interface ACS application material &》
8th interim paper《Defect-Rich Ultrathin Cobalt-Iron Layered Double Hydroxide for
Electrochemical Overall Water Splitting》Disclosed CoFe LDH-F is as electrolysis water oxygen evolution reaction
Working electrode, comparative example 2 be with《Nanometer flash report》15th interim paper《Hydrothermal Continuous Flow
Synthesis and Exfoliation of NiCo Layered Double Hydroxide Nanosheets for
Enhanced Oxygen Evolution Catalysis》Work of the disclosed NiCo LDH as electrolysis water oxygen evolution reaction
Electrode, comparative example 3 be with《Chemical communication》53rd interim paper《Acid-etched layered double
hydroxides with rich defects for enhancing the oxygen evolution reaction》Institute is public
Working electrode of the CoFe LDHs opened as electrolysis water oxygen evolution reaction, comparative example 4 be with《Nano-scale》9th interim paper
《Construction of hierarchically porous graphitized carbon-supported NiFe
layered double hydroxides with a core–shell structure as an enhanced
electrocatalyst for the oxygen evolution reaction》Disclosed HPGC@NiFe is as electrolysis water
The working electrode of oxygen evolution reaction, comparative example 5 be with《ACS sustainable chemistry engineering》6th interim paper《Integrated
Flexible Electrode for Oxygen Evolution Reaction:Layered Double Hydroxide
Coupled with Single-Walled Carbon Nanotubes Film》Disclosed NiFe-LDH@SWNT is as electricity
Solve water oxygen evolution reaction working electrode, comparative example 6 be with《Energy & environmental science》10th interim paper《A layered
Na1-xNiyFe1-yO2double oxide oxygen evolution reaction electrocatalyst for highly
efficient water-splitting》Disclosed NaNi0.9Fe0.1O2It is right as the working electrode of electrolysis water oxygen evolution reaction
Ratio 7 be with《German applied chemistry》130th interim paper《Hierarchical Hollow Nanoprisms Based
on Ultrathin Ni-Fe Layered Double Hydroxide Nanosheets with Enhanced
Electrocatalytic Activity towards Oxygen Evolution》The hollow prism of disclosed NiFe LDH is made
For the working electrode of electrolysis water oxygen evolution reaction, comparative example 8 be with《Advanced material》30th interim paper《A Highly
Efficient Oxygen Evolution Catalyst Consisting of Interconnected Nickel–Iron-
Layered Double Hydroxide and Carbon Nanodomains》Disclosed Ni0.67Fe0.33/ C is as electrolysis water
The working electrode of oxygen evolution reaction, comparative example 9 be with《Nano-scale》9th interim paper《NiMn layered double
hydroxides as efficient electrocatalysts for the oxygen evolution reaction
and their application in rechargeable Zn–air batteries》Disclosed NiMn-LDHs conduct
The working electrode of electrolysis water oxygen evolution reaction, comparative example 10 be with《ACS application material interface》9th interim paper
《Interlayer Expansion of Layered Cobalt Hydroxide Nanobelts to Highly Improve
Oxygen Evolution Electrocatalysis》Disclosed Co (OH) (C6H5COO)·H2O is anti-as electrolysis elutriation oxygen
The working electrode answered.
As can be seen from Table 1：The oxo transition metal used in existing electrolysis elutriation oxygen field as non-precious metal catalyst
Compound is unitary or transiton metal binary oxides mostly, and that there are catalytic activity is low, overpotential is high and stability is poor etc. asks
Topic.And the ternary CoFeCr hydrotalcite nano stick in the final foam nickel base obtained of the embodiment of the present invention 1 is in alkaline electrolyte
There is the electrolysis elutriation oxygen catalytic activity much higher than existing transition metal oxide in environment.
To sum up, the transition metal oxide of the embodiment of the present invention not only than in the prior art has better electrolysis water
Analyse oxygen performance, and overpotential is low, stability is good, preparation process is simple, rapidly and efficiently, production energy consumption is low, production cost is low, ring
Protect pollution-free, suitable large-scale industrial production.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (7)
1. a kind of preparation method of ternary CoFeCr hydrotalcite nano stick, which is characterized in that include the following steps：
Step A, cobalt nitrate, ferric nitrate, chromic nitrate, urea, ammonium fluoride are mixed in water, makes after mixing nitre in solution
The concentration of sour cobalt is 40~80 mM/ls, the concentration of ferric nitrate is 8~20 mM/ls, the concentration of chromic nitrate is 8~20
MM/l, the concentration of urea be 0.5~0.8 mol/L, the concentration of ammonium fluoride is 0.2~0.3 mol/L, to be made
Precursor mixed solution；
Step B, substrate is placed in the precursor mixed solution, and by the substrate together with the precursor mixed solution
It is transferred in autoclave, is then reacted 360~600 minutes at 110~130 DEG C, so that ternary CoFeCr be made in substrate
Hydrotalcite nano stick.
2. the preparation method of ternary CoFeCr hydrotalcite nano stick according to claim 1, which is characterized in that the base
Bottom uses nickel foam, foam copper, carbon cloth or titanium foil.
3. the preparation method of ternary CoFeCr hydrotalcite nano stick according to claim 1 or 2, which is characterized in that described
Ternary CoFeCr hydrotalcite nano stick together with substrate directly as the working electrode of electrochemical decomposition water.
4. a kind of ternary CoFeCr hydrotalcite nano stick, which is characterized in that using described in any one of the claims 1 to 3
The preparation method of ternary CoFeCr hydrotalcite nano stick be prepared.
5. ternary CoFeCr hydrotalcite nano stick according to claim 4, which is characterized in that the ternary CoFeCr water
Talcum nanometer rods are nanometer rods of the homoepitaxial in substrate.
6. a kind of application of ternary CoFeCr hydrotalcite nano stick, which is characterized in that using any in the claims 4 to 5
Ternary CoFeCr hydrotalcite nano stick described in is used for electrochemical decomposition water.
7. a kind of application of ternary CoFeCr hydrotalcite nano stick, which is characterized in that by any one of the claims 1 to 3
Ternary CoFeCr hydrotalcite nano stick obtained by the preparation method of the ternary CoFeCr hydrotalcite nano stick is together with substrate
Together directly as the working electrode of electrochemical decomposition water.
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