Multi-metal non-oxide electrocatalyst as well as preparation method and application thereof

A technology for oxide electrolysis and catalyst, which is applied to electrodes, electrolysis process, electrolysis components, etc., can solve the problems of easy aggregation of catalysts, limited effect, limited effective electroactive sites, etc., and achieves simple and controllable preparation method and improved reaction rate. , to achieve the effect of application value

Pending Publication Date: 2021-07-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of catalyst is easy to aggregate, resulting in limited effective electroactive sites expo

Method used

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  • Multi-metal non-oxide electrocatalyst as well as preparation method and application thereof
  • Multi-metal non-oxide electrocatalyst as well as preparation method and application thereof
  • Multi-metal non-oxide electrocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, the preparation of precursor ZIF-67: 0.87gCo(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL of methanol, and the solution was injected into 20 mL of methanol containing 1.97 g of 2-methylimidazole under stirring, and the purple precipitate obtained after standing at room temperature for 24 h was centrifuged and washed 3 times with absolute ethanol, Then it was dried in vacuum at 70°C for 10 h to obtain ZIF-67.

[0032] Step 2, Synthesis of Co-Fe layered double hydroxide (CoFe-LDH):

[0033] First disperse 0.08g of ZIF-67 in 40mL ethanol to obtain ZIF-67 alcohol dispersion;

[0034] then in N 2 Under the atmosphere, mix 20mL ethanol with 0.18gFeCl 2 4H 2 5 mL of deionized aqueous solution of O was quickly poured into the above-mentioned ZIF-67 alcohol dispersion at room temperature, stirred for 30 min, centrifuged to obtain a precipitate, washed with ethanol three times, and vacuum-dried at 70 °C for 10 h to obtain CoFe-LDH.

[0035] Step 3, Synthesis of Co-Fe-Mo...

Embodiment 2

[0043] Step 1, the preparation of precursor ZIF-67: 0.87gCo(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL of methanol, and the solution was injected into 20 mL of methanol containing 1.97 g of 2-methylimidazole under stirring, and the purple precipitate obtained after standing at room temperature for 24 h was centrifuged and washed 3 times with absolute ethanol, Then it was dried in vacuum at 70°C for 10 h to obtain ZIF-67.

[0044] Step 2, Synthesis of Co-Fe layered double hydroxide (CoFe-LDH):

[0045] First, disperse 0.08 g of ZIF-67 in 36 mL of ethanol to obtain a ZIF-67 alcohol dispersion;

[0046] then in N 2 Under the atmosphere, mix 20mL ethanol with 0.18gFeCl 2 4H 2 4.5 mL deionized aqueous solution of O was quickly poured into the above ZIF-67 alcohol dispersion at room temperature, stirred for 30 min, centrifuged to obtain a precipitate, washed with ethanol three times, and vacuum dried at 65 °C for 12 h to obtain CoFe-LDH.

[0047] Step 3, Synthesis of Co-Fe-Mo la...

Embodiment 3

[0055] Step 1, the preparation of precursor ZIF-67: 0.85gCo(NO 3 ) 2 ·6H 2 O was dissolved in 28 mL of methanol, and the solution was poured into 18 mL of methanol containing 1.95 g of 2-methylimidazole under stirring, and the purple precipitate obtained after standing at room temperature for 18 h was centrifuged and washed twice with absolute ethanol. It was then dried in vacuum at 68°C for 11 h to obtain ZIF-67.

[0056] Step 2, Synthesis of Co-Fe layered double hydroxide (CoFe-LDH):

[0057] First, disperse 0.08 g of ZIF-67 in 42 mL of ethanol to obtain a ZIF-67 alcohol dispersion;

[0058] then in N 2 Under the atmosphere, mix 20mL ethanol with 0.18gFeSO 4 ·6H 2 5 mL of deionized aqueous solution of O was quickly poured into the above ZIF-67 alcohol dispersion at room temperature, stirred for 30 min, centrifuged to obtain a precipitate, washed with ethanol three times, and vacuum-dried at 70 °C for 12 h to obtain CoFe-LDH.

[0059] Step 3, Synthesis of Co-Fe-Mo laye...

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Abstract

The invention discloses a multi-metal non-oxide electrocatalyst as well as a preparation method and application thereof. Co-Fe layered double hydroxides are prepared from a metal organic framework ZIF-6 and ferrite under the protection of nitrogen through a coprecipitation method; a molybdate aqueous solution is added into an alcohol dispersion liquid of the Co-Fe layered double hydroxides, and Co-Fe-Mo layered double hydroxides are prepared by a coprecipitation method; finally, under the protective atmosphere, the Co-Fe-Mo layered double hydroxides and a phosphate solid are annealed through a tube furnace, and the Co-Fe-Mo phosphide is obtained; and solvothermal reaction is conducted on the Co-Fe-Mo layered double hydroxides and a selenium salt solution to obtain the Co-Fe-Mo selenide. The preparation method of the electrocatalyst is easy and convenient to operate, low in cost and rich in raw material source, the prepared multi-metal non-oxide electrocatalyst is derived from a metal organic framework structure, multi-metal atoms cooperate with one another, and the electrocatalytic activity of the multi-metal non-oxide electrocatalyst is effectively improved. When being directly used as an electrocatalyst for oxygen evolution reaction, the electrocatalyst shows relatively small overpotential, relatively low Tafel slope and good cycling stability.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and application, and relates to a multi-metal non-oxide electrocatalyst, a preparation method and application thereof. Background technique [0002] With the reduction of fossil fuel resources and the further aggravation of global environmental problems, clean and renewable hydrogen energy has become the most ideal energy substitute. The electrolysis of water produces oxygen (O) through the oxygen evolution reaction (OER) at the anode and the hydrogen evolution reaction (HER) at the cathode. 2 ) and hydrogen (H 2 ), this process has become one of the most ideal and promising methods for large-scale production of hydrogen. However, anodic OER involves the transfer of four electrons and four protons, and this reaction proceeds with relatively high resistance from a thermodynamic point of view. Currently, RuO 2 and IrO 2 It is an effective electrocatalyst for oxygen evolution reacti...

Claims

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Application Information

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IPC IPC(8): C25B11/031C25B11/04C25B1/04B82Y30/00B82Y40/00
CPCC25B11/04C25B1/04B82Y30/00B82Y40/00Y02E60/36
Inventor 周元臻武云党媛韩萍孙小琴
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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