A novel oxygen evolution electrocatalyst and its preparation method and application

An electrocatalyst and oxygen evolution technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of harsh conditions, electroactivity needs to be improved, and catalyst structure is easy to collapse, so as to achieve good catalytic activity, The effect of improving the performance of electrocatalytic oxygen evolution

Active Publication Date: 2022-06-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But compared to noble metal catalysts, Ni 3 S 2 The electrical activity still needs to be improved [J.Am.Chem.Soc.2015,137(44)]
Chinese patent document [201810212195.4] discloses a 3D self-assembled spherical vanadium-modified Ni 3 S 2 The combined method of immersing clean metallic nickel into the vanadium source, and performing microwave solvothermal reaction to obtain a self-assembled spherical vanadium-modified electrocatalyst material; but this method has complex operation steps, harsh conditions and technical difficulties
Chinese patent document [201810393638.4] discloses an oxygen evolution electrocatalyst and its preparation method and application. A sponge nickel skeleton coated with foamed graphene is synthesized by hydrothermal method and chemical vapor deposition method. However, the operation steps of this method are complicated. And the reaction cycle is long, the technology is difficult, and the catalyst structure is easy to collapse

Method used

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  • A novel oxygen evolution electrocatalyst and its preparation method and application
  • A novel oxygen evolution electrocatalyst and its preparation method and application
  • A novel oxygen evolution electrocatalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The cut metal Ni foam (2cm×4cm) was ultrasonically cleaned with 3M HCl, acetone, water, and ethanol for 10 min, and vacuum dried at 60° C. for 6 h before use. Weigh 1.0mmoL Bi (NO 3 ) 3 ·5H 2 O was dissolved in 40 mL of ethylene glycol to give solution A. Solution B was obtained by dissolving 1.5 mmol of thiourea in 20 mL of ethylene glycol solvent. Add solution B dropwise to solution A, stir well and mix well. The mixed solution was then transferred to the autoclave, and at the same time 1 piece of the above clean and dry metal Ni foam was taken and placed vertically into the sealed high temperature autoclave. Finally, the reaction kettle was put into an oven, and the reaction temperature was controlled to be 160° C. After solvothermal reaction for 16 h, the reaction kettle was taken out and cooled naturally. The product was repeatedly washed with deionized water and ethanol, and dried in a vacuum oven at 60 °C for 12 h to obtain Bi 2 S 3 / Ni 3 S 2 / NF heteroj...

Embodiment 2

[0030] Example 2 is similar to Example 1, and the solvent in Example 2 is deionized water. Earned Bi 2 S 3 / Ni 3 S 2 / NF was used as the working electrode, and Hg / HgO and platinum sheets were used as the reference electrode and the counter electrode, respectively. Electrodes prepared in deionized water do not meet the requirements for flexible working electrodes.

Embodiment 3

[0032] Example 3 is similar to Example 1, and the solvent in Example 3 is ethanol. Earned Bi 2 S 3 / Ni 3 S 2 / NF was used as the working electrode, and Hg / HgO and platinum sheets were used as the reference electrode and the counter electrode, respectively. at 10mA cm -2 The reference current density of Bi prepared in ethanol 2 S 3 / Ni 3 S 2 / NF, only 310mV overpotential is required.

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Abstract

The invention discloses a novel oxygen evolution electrocatalyst and its preparation method and application. (1) dissolving the nitrate of the metal element in the P region in a solvent to obtain a solution A; dissolving thiourea in a solvent to obtain a solution B; B was added dropwise into solution A, fully stirred and mixed evenly, and transferred to the reaction kettle; (2) Take the clean and dry metallic Ni foam and put it vertically into the reaction kettle, and after solvothermal reaction, deionized water and Repeated cleaning with ethanol several times, and drying in a vacuum box, a new type of oxygen evolution electrocatalyst was obtained. The present invention provides asymmetric SP with P block elements 3 The hybridization-induced electronic effect significantly improves the electrocatalytic performance. A simple and gentle solvothermal method is used to prepare flexible self-assembled fleshy Bi with Ni foam network as the substrate and Ni source, P-block element Bi or Sb. 2 S 3 / Ni 3 S 2 / NF or Sb 2 S 3 / Ni 3 S 2 / NF heterojunction working electrode for electrocatalytic oxygen evolution reaction. Bi 2 S 3 or Sb 2 S 3 Unique Asymmetric SP 3 Hybridization modulates the electronic structure of the heterojunction to enhance the electrocatalytic performance.

Description

technical field [0001] The invention relates to the field of electrocatalysts, in particular to a preparation method and application of a novel and efficient catalytic oxygen evolution electrode material. Background technique [0002] Energy shortage and environmental pollution are urgent problems to be solved in today's world. Electrocatalytic water splitting technology is considered to be one of the effective ways to obtain new energy because of its simple preparation method, abundant water resources and clean products. However, the anodic OER kinetic process is slow, and the water splitting reaction can only occur at a higher potential, which greatly restricts the large-scale development of water electrolysis for hydrogen production. Therefore, the development of abundant, efficient and environmentally friendly oxygen evolution catalysts is the core step to solve the problem of hydrogen production by electrolysis of water, which is of great significance to the storage an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043C25B1/04C25B11/054C25B11/061C25B11/091
CPCB01J35/0033B01J27/043C25B1/04C25B11/057C25B11/091Y02E60/36
Inventor 薛卫东王帅卢正赵睿
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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