A kind of method of hydrothermal synthesis cu-n-c catalyst

Abstract

The invention relates to a synthesis method for a Cu-N-C catalyst by a hydrothermal method, and belongs to the technical field of a new energy material. According to the synthesis method, high-purity copper powder is added to ammonium hydroxide to obtain a copper ammonia coordination compound solution through a chemical reaction; next, a copper ammonia solution is mixed with a carbon oxide nanomaterial; and by virtue of a flocculation phenomenon generated by the electrostatic interaction between a copper ammonia coordination compound and the carbon oxide nanomaterial, the copper ammonia coordination compound is tightly attached to the periphery of the carbon oxide nanomaterial to form a copper ammonia coordination compound-graphene oxide complex. The carbon-based catalyst disclosed by the invention is synthesized at a relatively low temperature, so that high-temperature pyrolysis is not required; and in addition, the synthesized Cu-N-C carbon-based catalyst has relatively high ORR activity and stability and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for synthesizing a high-performance Cu-N-C catalyst by a hydrothermal method, belonging to the technical field of new energy materials. Background technique [0002] Fuel cells are regarded as one of the effective tools to deal with global environmental and energy problems, and the main content of current research focuses on improving energy conversion efficiency. At present, platinum (Pt)-based catalysts are mainly used for fuel cell cathode oxygen reduction reaction (ORR), but Pt resources are scarce and expensive. Therefore, the cost problem is the main reason for limiting the commercialization of fuel cells, and the development of low-cost, high ORR activity and high stability cathode catalysts is of great significance to promote the commercialization of fuel cells. [0003] In recent years, heteroatom-doped carbon materials have been investigated as effective metal-free ORR electrocatalysts, especially nitrogen (...

AI Technical Summary

Problems solved by technology

Although these carbon-based catalysts all exhibit good ORR activities, their ORR activities are all limited by the 2 / 2 electron mechanism, that is, the former two-electron transfer (oxygen is reduced to hydrogen peroxide) is more important than the latter two-electron transfer ( Peroxide reduction to water) is faster, resulting in an incomplete four-electron transfer (oxygen is reduced to water) (Journal of Materials Chemistry A, 2013, 1(42): 13179-13185. )

In order to solve the problem of low ORR activity caused by the two-electron transfer of metal-free carbon-based catalysts, transition metals such as iron (Fe), cobalt (Co), and manganese (Mn) were incorporated into carbon materials to make carbon-based catalysts achieve four-electron transfer, which improves the ORR activity; but so far, the catalytic performance of carbon-based catalysts is still far behind that of platinum (Pt)-based catalysts; therefore, it is still challenging to explore high-performance carbon-based catalysts.

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