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Novel oxygen evolution electrocatalyst as well as preparation method and application thereof

An electrocatalyst and oxygen evolution technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems such as the need to improve the electroactivity, the complicated operation steps, and the technical difficulty, so as to improve the electrocatalytic oxygen evolution. performance effect

Active Publication Date: 2020-05-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Novel oxygen evolution electrocatalyst as well as preparation method and application thereof
  • Novel oxygen evolution electrocatalyst as well as preparation method and application thereof
  • Novel oxygen evolution electrocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0030] Example 2 is similar to Example 1, and the solvent in Example 2 is deionized water. Income Bi 2 S 3 / Ni 3 S 2 / NF is the working electrode, and Hg / HgO and platinum sheets are used as the reference electrode and the counter electrode, respectively, to assemble an electrocatalytic three-electrode system for electrocatalytic testing. Electrodes prepared in deionized water do not meet the requirements of flexible working electrodes.

Embodiment 3

[0032] Example 3 is similar to Example 1, and the solvent in Example 3 is ethanol. Income Bi 2 S 3 / Ni 3 S 2 / NF is the working electrode, and Hg / HgO and platinum sheets are used as the reference electrode and the counter electrode, respectively, to assemble an electrocatalytic three-electrode system for electrocatalytic testing. at 10mA cm -2 Bi prepared in ethanol at a reference current density of 2 S 3 / Ni 3 S 2 / NF, only an overpotential of 310mV is required.

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Abstract

The invention discloses a novel oxygen evolution electrocatalyst as well as a preparation method and application thereof, which comprises the following steps: (1) dissolving nitrate of metal elementsin a P region into a solvent to obtain a solution A, dissolving thiourea in a solvent to obtain a solution B, dropwise adding the solution B into the solution A, fully stirring and uniformly mixing the mixture, and transferring the mixture into a reaction kettle; and (2) vertically putting the cleaned and dried metal Ni foam into a reaction kettle, carrying out solvothermal reaction to obtain a heterojunction, repeatedly washing the heterojunction with deionized water and ethanol for several times, and drying the product in a vacuum box to obtain the novel oxygen evolution electrocatalyst. According to the preparation method, the electro-catalytic performance is remarkably improved by a P-region element asymmetric SP3 hybridization induced electron effect; by means of a simple, convenientand mild solvothermal method, a Ni foam net is used as a substrate and a Ni source, and a P-region element Bi or Sb induces to prepare a flexible self-assembled succulent Bi2S3 / Ni3S2 / NF or Sb2S3 / Ni3S2 / NF heterojunction working electrode for electrocatalytic oxygen evolution reaction. The Bi2S3 or Sb2S3 has a unique asymmetric SP3 hybrid modulation heterojunction electronic structure, so that the electro-catalytic performance is improved.

Description

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

Claims

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Application Information

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IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/057C25B11/091B01J35/33Y02E60/36
Inventor 薛卫东王帅卢正赵睿
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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