Novel transition metal-modified redox catalyst and preparation method thereof

Abstract

The invention relates to the field of chemical technologies of carbon materials, and in particular relates to a novel transition metal-modified redox catalyst and a preparation method thereof. A metal-organic frame compound acquired by modification of monatomic transition metal after coordination is used as a precursor, and the novel transition metal-modified redox catalyst is acquired by carbonization and subsequent acid treatment methods. The method provided by the invention is different from the transition metal modification method by using a traditional impregnation method and a physical hybrid method, and has the characteristics that the transition metal active sites with high dispersity can be acquired, enhancement on catalytic activity of the catalyst in an oxygen reduction reactionis facilitated, and the novel transition metal-modified redox catalyst can be used as a substitute catalyst of a traditional platinum catalyst.

Description

technical field [0001] The invention relates to the technical field of carbon material chemistry, in particular to a novel transition metal-modified redox catalyst and a preparation method thereof. Background technique [0002] Oxygen reduction reaction (ORR) is a cathodic reaction in high-efficiency energy conversion technologies such as fuel cells and metal-air batteries. In order to enhance the activity of ORR catalysts and accelerate the reaction kinetics, traditional ORR catalysts use the noble metal platinum as the active center. However, the reserves of platinum on the earth are low, platinum is expensive, and platinum-based catalysts generally have disadvantages such as poor stability and easy catalyst poisoning, which seriously hinder the development and application of fuel cells. [0003] Non-precious metal catalysts represented by carbon-based catalysts have been widely used in the field of electrochemistry due to their advantages such as wide sources, high catal...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a novel transition metal-modified redox catalyst and its preparation method, which uses transition metal ions to carry out post-coordination modification on metal-organic framework compounds, and then carbonizes to prepare carbon-based catalysts. The method of oxygen reduction catalyst can solve the shortcomings of easy aggregation of active sites and low catalytic activity

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