Novel nickel-iron electrolysis water oxygen production catalyst and preparation method thereof

A technology of oxygen catalyst and nickel-iron, which is applied in the field of electrocatalysis, can solve the problems of low intrinsic activity of oxygen production, complex preparation process, and difficult process, and achieve the effect of excellent oxygen production activity, simple preparation method and high intrinsic activity

Active Publication Date: 2020-11-27
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems in the prior art that the nickel-iron bimetallic electrolytic oxygen production catalyst has low intrinsic activity of oxygen production, complex preparation process and lar

Method used

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  • Novel nickel-iron electrolysis water oxygen production catalyst and preparation method thereof
  • Novel nickel-iron electrolysis water oxygen production catalyst and preparation method thereof
  • Novel nickel-iron electrolysis water oxygen production catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0044] A novel nickel-iron electrolysis water oxygen production catalyst, its preparation method comprises the following steps:

[0045] (1) Using carbon cloth as the substrate and a mixed solution of 2mM cerium nitrate and 10mM sodium chloride as the electrolyte, CeO was prepared by electroplating 2 Carbon cloth, electroplating conditions: electrodeposition current is 0.25 mA / cm 2 , the electrodeposition time is 20min, and the temperature is 70℃;

[0046] (2) CeO2 film at 10%H 2 / Ar 500℃ for 2h to obtain CeO rich in oxygen vacancies 2-x Carbon cloth, where x is 1.5;

[0047] (3) The CeO rich in oxygen vacancies 2-x The carbon cloth is immersed in a mixed solution of nickel nitrate and ferric nitrate for treatment, wherein the total concentration of metal ions in the mixed solution is 0.1M, the treatment time is 0.5h, and the treatment temperature is 60°C;

[0048] (4) Take it out and wash it with ultrapure water several times, then dry it naturally in the air to get CeO ...

Embodiment 2

[0051] A novel nickel-iron electrolysis water oxygen production catalyst, its preparation method comprises the following steps:

[0052] (1) Using carbon cloth as the substrate and a mixed solution of 2mM cerium nitrate and 10mM sodium chloride as the electrolyte, CeO was prepared by electroplating 2 Carbon cloth, electroplating conditions: electrodeposition current is 0.25 mA / cm 2 , the electrodeposition time is 20min, and the temperature is 70℃;

[0053] (2) CeO 2 film at 10%H 2 / Ar 500℃ for 2h to obtain CeO rich in oxygen vacancies 2-x Carbon cloth, where x is 1.2;

[0054] (3) The CeO rich in oxygen vacancies 2-x The carbon cloth is soaked in a mixed solution of nickel nitrate and ferric nitrate for treatment, wherein the total concentration of metal ions in the mixed solution is 0.1M, the treatment time is 4h, and the treatment temperature is 40°C;

[0055] (4) Take it out and wash it with ultrapure water several times, then dry it naturally in the air to get CeO 2...

Embodiment 3

[0057] A novel nickel-iron electrolysis water oxygen production catalyst, its preparation method comprises the following steps:

[0058] (1) Using carbon cloth as the substrate and a mixed solution of 2mM cerium nitrate and 10mM sodium chloride as the electrolyte, CeO was prepared by electroplating 2 Carbon cloth, electroplating conditions: electrodeposition current is 0.25 mA / cm 2 , the electrodeposition time is 20min, and the temperature is 70℃;

[0059] (2) CeO 2 film at 10%H 2 / Ar 500℃ for 2h to obtain CeO rich in oxygen vacancies 2-x Carbon cloth, where x is 1.8;

[0060] (3) The CeO rich in oxygen vacancies 2-x The carbon cloth is immersed in a mixed solution of nickel nitrate and ferric nitrate for treatment, wherein the total concentration of metal ions in the mixed solution is 0.1M, the treatment time is 8 hours, and the treatment temperature is 20°C;

[0061] (4) Take it out and wash it with ultrapure water several times, then dry it naturally in the air to get...

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Abstract

The invention provides a novel nickel-iron bimetallic electrolysis water oxygen production catalyst. The valence state of nickel is high-valence +3 and + 4. An effective measure for improving the oxygen production performance of the catalyst is to improve the valence states of nickel and iron, especially the valence state of nickel, so as to obtain higher intrinsic activity; the invention providesthe method for preparing the high-valence nickel (+ 3 and + 4) iron bimetallic oxygen production catalyst under the condition of approximate normal temperature and normal pressure; the catalyst showsparticularly excellent oxygen production activity; and the preparation method is simple and suitable for large-scale production. According to the basic principle of the novel nickel-iron bimetallic electrolysis water oxygen production catalyst prepared by the method, the invention further provides a method for converting multivalent metal from low valence to high valence, so that besides the nickel provided by the invention, more low valence metal can be converted into high valence metal, so that different actual requirements can be met.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and relates to a novel nickel-iron electrolysis water oxygen production catalyst and a preparation method thereof. Background technique [0002] In order to use renewable energy on a large scale, efficient energy storage devices must be developed. In energy conversion and energy storage technologies such as water electrolysis, fuel cells, metal-air batteries, and photoelectrochemical cells, the electrocatalytic oxygen production reaction is a key step. Since the oxygen generation reaction involves a 4-electron transfer process, a higher overpotential is needed to overcome the reaction activation energy barrier. Therefore, it is urgent to develop a class of oxygen generation catalysts with high efficiency, low overpotential, good stability and low price. The key issue. [0003] Non-precious metal catalysts have attracted extensive attention from researchers due to their price advantage. Among th...

Claims

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Application Information

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IPC IPC(8): B01J23/83C25B11/06C25B1/04
CPCB01J23/83B01J35/0033C25B11/04C25B1/04Y02E60/36
Inventor 杨世和於俊
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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