Preparation method for reduced graphene-polyaniline loaded manganece-cerium oxide electro-catalyst

Abstract

The invention relates to a preparation method for a reduced graphene-polyaniline loaded manganece-cerium oxide electro-catalyst. The composite catalyst has high-oxygen reduction catalytic activity and is easy to prepare at a large scale. The reduced graphene with large specific surface is modified by high-conductivity polyaniline molecules, and then low-scale manganece-cerium oxide particles with oxygen reduction catalytic activity is loaded to improve the catalytic efficiency. The preparation method comprises the following steps of (1) preparing a graphene oxide solution; (2) synthesizing graphene oxide-polyaniline; (3) centrifugally drying a product obtained in the step (2); (4) carrying out ultrasonic dispersion on powder obtained in the step (3) in deionized water, and adding a hydrazine hydrate solution for heating reaction until the graphene oxide is reduced; (5) centrifugally drying a product obtained in the step (4); and (6) preparing a reduced graphene-polyaniline suspension liquid by taking the powder obtained in the step (5), adding manganese acetate and cerium nitrate, regulating pH to be 9 with a KOH solution, adding a potassium permanganate solution under a heating condition, and centrifugally drying the solution after stirring reaction for a period.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a method for preparing a reduced graphene-polyaniline supported cerium manganese oxide electrocatalyst. Background technique [0002] Hydrogen fuel cells have the characteristics of high energy density, low cost, and no pollution, and have received extensive attention. In the application process of fuel cells, their own performance and price are important factors limiting their development. In a high-performance fuel cell, the catalyst for oxygen reduction at the positive electrode is mainly noble metals such as platinum and silver, which have good reduction catalytic ability. [0003] The cost of noble metals is too high to be commercialized, and carbon materials have high electrical conductivity and low cost, but low catalytic activity. The currently used manganese dioxide material is mostly used in small batteries due to its large particles and low specific surface area. In order t...

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Problems solved by technology

[0003] The cost of precious metals is too high to be commercialized, and carbon materials have high conductivity and low cost, but low catalytic activity

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