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Oxygen evolution electrocatalyst and preparation method and application thereof

An electrocatalyst and oxygen evolution technology, which is used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of high electronic conductivity, high catalytic performance, and simple and convenient preparation methods

Active Publication Date: 2018-10-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Research in this area is rarely reported

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  • Oxygen evolution electrocatalyst and preparation method and application thereof
  • Oxygen evolution electrocatalyst and preparation method and application thereof
  • Oxygen evolution electrocatalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Dissolve 1.243g of nickel acetate in 69mL of deionized water, then add 6mL of hydrazine hydrate and stir evenly to form a mixed solution, add it to a polytetrafluoroethylene autoclave, put clean foamed nickel at the bottom of the kettle as a growth substrate, seal and heat, The hydrothermal temperature is 160° C., and the hydrothermal time is 6 hours. After cooling to room temperature, wash the sample with deionized water and ethanol for several times and dry it. Place the obtained sponge nickel skeleton in a mixed atmosphere of pure argon and hydrogen at a flow rate of 180sccm: 20sccm. After the temperature rises to 900°C, keep it warm After 15 minutes, ethanol gas was introduced into the reaction chamber by a bubbling method to react for 15 minutes to obtain a sponge nickel skeleton substrate covered with a layer of foamed graphene. 300mg of thiourea, 150mg of sodium molybdate and 0.4g of polyvinylpyrrolidone (PVP, K30) were dissolved in 60mL of deionized water, added...

Embodiment 2

[0031] Dissolve 1.243g of nickel acetate in 69mL of deionized water, then add 6mL of hydrazine hydrate and stir evenly to form a mixed solution, add it to a polytetrafluoroethylene autoclave, put clean foamed nickel at the bottom of the kettle as a growth substrate, seal and heat, The hydrothermal temperature is 180° C., and the hydrothermal time is 8 hours. After cooling down to room temperature, wash the sample with deionized water and ethanol for several times and dry it. Place the obtained sponge nickel skeleton in a mixed atmosphere of pure argon and hydrogen at a flow rate of 180sccm: 20sccm. After the temperature rises to 800°C, keep warm After 10 minutes, ethanol gas was introduced into the reaction chamber by a bubbling method to react for 20 minutes to obtain a sponge nickel skeleton substrate coated with a layer of foamed graphene. 300mg of thiourea, 150mg of sodium molybdate and 0.4g of polyvinylpyrrolidone (PVP, K30) were dissolved in 60mL of deionized water, adde...

Embodiment 3

[0033] Dissolve 1.243g of nickel acetate in 69mL of deionized water, then add 6mL of hydrazine hydrate and stir evenly to form a mixed solution, add it to a polytetrafluoroethylene autoclave, put clean foamed nickel at the bottom of the kettle as a growth substrate, seal and heat, The hydrothermal temperature is 200° C., and the hydrothermal time is 6 hours. After cooling to room temperature, wash the sample with deionized water and ethanol for several times and dry it. Place the obtained sponge nickel skeleton in a mixed atmosphere of pure argon and hydrogen at a flow rate of 180sccm: 20sccm. After heating up to 1000°C, keep it warm After 15 minutes, ethanol gas was introduced into the reaction chamber by a bubbling method to react for 15 minutes to obtain a sponge nickel skeleton substrate covered with a layer of foamed graphene. 300mg of thiourea, 150mg of sodium molybdate and 0.4g of polyvinylpyrrolidone (PVP, K30) were dissolved in 60mL of deionized water, added to a poly...

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Abstract

The invention discloses an oxygen evolution electrocatalyst (N-Ni3S2@MoS2 / SN) and a preparation method and the application thereof. The oxygen evolution electrocatalyst has a three-dimensional core-shell array skeleton. By a hydrothermal method and a chemical vapor deposition method, a sponge nickel skeleton coated with foamed graphene is synthesized, and with the sponge nickel skeleton as a carrier, by a one-step hydrothermal method and ammonia gas sintering, the oxygen evolution electrocatalyst is prepared. The preparation method is simple, convenient and easy to control. The oxygen evolution electrocatalyst comprises sponge nickel, the foamed graphene coating the sponge nickel and nanowires grown on the foamed graphene, wherein the nanowires are formed from Ni3S2 and MoS2 materials andare doped with nitrogen. The oxygen evolution electrocatalyst has a nanoarray skeleton adopting a three-dimensional core-shell structure, has excellent oxygen evolution reaction catalyzing activity, relatively high electron conductivity and relatively high stability in an alkaline solution, can still maintain high catalytic performance and high stability in high-temperature and low-temperature environments, and is especially suitable for an oxygen evolution reaction.

Description

technical field [0001] The invention relates to the field of high-efficiency catalysts for oxygen evolution reaction, in particular to an oxygen evolution electrocatalyst capable of maintaining high catalytic activity and high stability in high and low temperature environments, and a preparation method and application thereof. Background technique [0002] The electrochemical oxygen evolution reaction has received much attention as a necessary step in water electrolysis and metal-air batteries. In the electrochemical oxygen evolution reaction, the core is the catalyst for the reaction. An efficient catalyst can reduce the overpotential of the reaction and has good stability. At present, noble metal oxides such as RuO 2 , InO 2 etc. are still the most practical catalysts for the electrocatalytic oxygen evolution reaction, but their high price and low natural abundance cannot meet the industrial application of human beings. Therefore, the development and design of oxygen ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J27/24B01J35/00B01J37/02B01J37/08B01J37/10C25B1/02C25B11/06
CPCC25B1/02B01J27/0515B01J27/24B01J37/0225B01J37/08B01J37/10C25B11/051B01J35/33
Inventor 夏新辉张凯丽王秀丽涂江平
Owner ZHEJIANG UNIV
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