Catalytic oxygen evolution electrode and preparation method and application thereof

A technology for oxygen evolution electrodes and catalysts, applied in electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of high catalyst preparation costs, affecting catalytic activity, expensive noble metal catalysts, etc., achieve catalytic activity without breaking the ring, and improve compatibility Effect

Active Publication Date: 2018-08-31
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, while preparing noble metals, metal oxides and double perovskite materials to catalyze oxygen evolution electrodes, the performance of oxygen evolution electrodes still needs to be further improved. The electrical conductivity of the material is low. On the other hand, it is the matching problem between the oxygen evolution catalyst electrode and the acid-base electrolyte.
Conventional commercial electrolytes are alkaline, and the electrolyte itself will also promote adverse reactions such as morphology changes, structural collapse, and reduction of active sites of oxygen evolution catalyst materials, thereby affecting its catalytic activity.
Conventional oxygen evolution catalyst modification includes doping of transition metals, doping of non-metallic elements, mixing of two-dimensional materials such as graphene and molybdenum disulfide, and H 2 , NH 3 Such as reducing gas heat treatment modification, etc., but the preparation process of this kind of modification method is relatively cumbersome, and the preparation cost of the catalyst is relatively high

Method used

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  • Catalytic oxygen evolution electrode and preparation method and application thereof
  • Catalytic oxygen evolution electrode and preparation method and application thereof
  • Catalytic oxygen evolution electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Prepare 1mol L of analytical pure KOH and high-purity water -1 The electrolytic solution is fed with high-purity oxygen until the electrolyte is saturated with oxygen, and the experimental temperature is room temperature 25°C;

[0044] (2) PrBa with an oxygen evolution catalyst active material diameter of 200nm 0.5 Sr 0.5 co 1.5 Fe 0.5 o 5+α Nanowires, dispersed in a mixed solution of isopropanol, ultrapure water and 5wt.% NafionPFSAPolymer Dispersions D520 (produced by DuPont), to obtain a concentration of 5mg mL -1 Obtain catalyst solution, isopropanol, ultrapure water and 5wt.%NafionPFSAPolymer Dispersions D520 volume ratio in mixed solution are 45%: 45%: 10%, and all embodiments of the present invention use perfluorinated sulfonic acid resin to be 5wt.%Nafion PFSA The mixed solution of Polymer Dispersions D520 (produced by DuPont);

[0045] (3) Under room temperature conditions, the catalyst solution prepared in step (2) was ultrasonically treated for 3 ho...

Embodiment 2

[0054] (1) Prepare 1mol L of analytical pure KOH and high-purity water -1 The electrolytic solution is fed with high-purity oxygen until the electrolyte is saturated with oxygen, and the experimental temperature is room temperature 25°C;

[0055] (2) The abrasive tool cuts out a circular carbon paper with a diameter of 16.2 mm;

[0056] (3) put the carbon paper described in step (2) into the electrolytic solution prepared in step (1), carry out relative to saturated Ag / AgCl reference electrode negative pressure 0.6V constant voltage treatment 1200s, obtain the carbon paper of negative pressure treatment Paper electrodes.

[0057] The prepared carbon paper electrode was tested for oxygen evolution activity, and the test results were as follows: Figure 8 shown.

Embodiment 3

[0061] (1) Prepare 1mol L of analytical pure KOH and high-purity water -1 The electrolytic solution is fed with high-purity oxygen until the electrolyte is saturated with oxygen, and the experimental temperature is room temperature 25°C;

[0062] (2) The oxygen evolution catalyst active material IrO 2 Dispersed in a mixed solution of isopropanol, ultrapure water and 5wt.% NafionPFSA Polymer Dispersions D520 (manufactured by DuPont) to obtain a concentration of 5mg mL -1 Obtain the catalyst solution, the volume ratio of isopropanol, ultrapure water and 5wt.% Nafion PFSA Polymer Dispersions D520 in the mixed solution is 45%: 45%: 10%;

[0063] (3) ultrasonically treating the catalyst solution prepared in step (2) for 3 hours to obtain a homogeneously dispersed catalyst suspension;

[0064] (4) A circular carbon paper with a diameter of 16.2 mm was cut out with an abrasive tool as a substrate for supporting the electrode active material.

[0065] (5) Use a micropipette to pipe...

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Abstract

The invention belongs to the technical field of electrolysis water catalyzation, and discloses a catalytic oxygen evolution electrode and a preparation method and application thereof. The catalytic oxygen evolution electrode is prepared in a manner that the voltage equivalent to -0.8 V--0.4 V of the voltage of a saturated Ag/AgCl reference electrode is applied in an electrolyte and the constant-pressure treatment time ranges from 30 s to 1800 s. According to the method that the catalytic oxygen evolution electrode can be used for reducing electrolysis water energy consumption, the catalytic activity of a noble metal catalyst (RuO2, IrO2), a metal catalyst (Co3O4) and a double perovskite material PrBa0.5Sr0.5Co1.5Fe0.5O5+alpha nanowire is improved; the treatment method is simple and practicable, and in the electrode preparation process, the shape and size of the electrode can be controlled; and the oxygen evolution performance of the catalytic oxygen evolution electrode prepared by themethod under the voltage ranging from 1 V to 2 V (relative to a reversible hydrogen electrode) is greatly improved, and application prospects are good.

Description

technical field [0001] The invention belongs to the technical field of electrode preparation, and in particular relates to a catalytic oxygen precipitation electrode and its preparation method and application. Background technique [0002] At present, in the selection of raw materials for new energy conversion equipment, hydrogen raw materials have great potential. Hydrogen energy equipment has high specific energy, good safety performance, and because there is no pollution in the energy conversion process, it has broad development prospects as a new energy conversion equipment. At present, the most ideal method for the production of hydrogen is electrolysis of water. With the advancement of technology and the continuous development of the market, it is increasingly important and urgent to improve the efficiency of electrolyzed water. Therefore, reducing the overpotential of the oxygen evolution electrode in electrolyzed water is the focus of current research. In addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/051C25B11/057C25B11/093Y02E60/36
Inventor 陈燕朱云敏刘茜何祖韵刘美林
Owner SOUTH CHINA UNIV OF TECH
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