Non-precious metal oxygen reduction catalyst and preparing method and application thereof

Abstract

The invention discloses a non-precious metal oxygen reduction catalyst and a preparing method and application thereof. The preparing method comprises the following steps that 1, conductive carbon is dispersed into water, and a carbon source and ferric salt are added to carry out a hydrothermal reaction, so that a precursor is obtained; 2, heat treatment is carried out on the precursor and a nitrogen source to obtain the non-precious metal oxygen reduction catalyst. An iron source is dispersed into a solution phase, a hydrothermal method is used for compounding the iron source and an obtained carbon layer, then high-temperature treatment is carried out, nitrogen is doped to prepare a FeN4 active site, and compared with other methods of directly mixing the iron source with the carbon source and the nitrogen source in a solid phase mode, the method is more uniform in compounding, and effectively prevents iron atoms from aggregating at high temperature and growing up; moreover, the hydrothermal method and high-temperature treatment are convenient to control. The prepared catalyst is excellent in catalytic performance and has higher oxygen reduction activity compared with that of other existing non-precious metal catalysts.

Description

technical field [0001] The invention relates to a non-noble metal oxygen reduction catalyst and its preparation method and application, belonging to the field of fuel cell catalysts. Background technique [0002] In recent years, the problems of energy crisis and environmental pollution have been paid more and more attention by countries all over the world. Fuel cell is a clean and non-polluting power generation device with extremely high energy conversion efficiency, so it plays a pivotal role in solving these two problems. However, the key cathode oxygen reduction reaction has slow kinetics and requires rare noble metals as catalysts, which seriously hinders the wide application of fuel cells. Many people have begun to use precious metals and other transition metals to form alloys or special structures such as core-shell to increase the utilization rate of precious metals and reduce their loading, but this still cannot get rid of the limitations of precious metals themsel...

AI Technical Summary

Problems solved by technology

However, the key cathode oxygen reduction reaction has slow kinetics and requires rare noble metals as catalysts, which seriously hinders the wide application of fuel cells.

Many people have begun to use precious metals and other transition metals to form special structures such as alloys or core-shells to increase the utilization rate of precious metals and reduce their loading, but this cannot get rid of the limitations of precious metals themselves.

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