A double-carbon-confined iridium nanocluster and its preparation method and application

Abstract

The invention discloses a double-carbon-confined iridium nanocluster catalyst and a preparation method and application thereof. The double-carbon-confined iridium nanocluster catalyst is a composite material formed by dispersing iridium nanodots on a carbon matrix, and the carbon matrix is graphene oxide and S-doped mesoporous carbon. Ultra-small nano-sized iridium nanoclusters are prepared through the double confinement effect of two carbon groups, and the aggregation of iridium nano-particles can be effectively prevented. The finally obtained catalyst has large specific surface area, the active sites of the catalyst are increased, the overpotential and Tafel slope of electrolytic water reaction are greatly reduced, the performance of the catalyst is effectively improved, and the catalysthas long service life and good stability. In addition, the preparation method of the catalyst is simple, the raw materials are cheap and readily available, the reserves are abundant, the preparationprocess is simple and easy to operate, and the catalyst is a catalyst with practical value for electrolyzed water.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst preparation, and in particular relates to a double-carbon confined iridium nanocluster and a preparation method and application thereof. Background technique: [0002] Electrochemical water splitting is one of the most promising technologies for producing hydrogen energy. The most critical technical problem for successful industrialization is to find a suitable catalyst. In alkaline media, electrolysis of water involves two half-reactions, the reduction reaction (HER) of water at the cathode and the oxidation reaction (OER) of water at the anode. Because the OER reaction involves a four-electron transfer process, it is inherently more complex and has a slower kinetic process, resulting in the need for a high overpotential to promote the reaction efficiency, so the OER reaction is an important limit for the entire water electrolysis process. step. Therefore, the development of catalysts ...

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Problems solved by technology

[0006] However, there are still some defects in the above-mentioned prior art. The form of these materials is that small particles are limited by the surface, and they are easy to aggregate and disperse unevenly on the support body, resulting in a reduction in the number of active sites of the material and further reducing the catalytic performance.

Therefore, it is still a challenge to prepare a nanomaterial with small particle size, uniform shape, large specific surface area, and the ability to prevent catalyst particles from agglomerating as a catalyst for electrolysis of water.

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