Hollow carbon-coated copper oxide nanoparticle catalyst as well as preparation method and application thereof

Abstract

The invention discloses a hollow carbon-coated copper oxide nanoparticle catalyst and a preparation method and application thereof. The preparation method comprises the steps: in an inert atmosphere, calcining copper metal organic framework powder for the first time, and obtaining a red product; carrying out secondary calcination treatment on the red product in an air atmosphere to obtain a calcined product; and grinding and sieving the calcined product to obtain the hollow carbon-coated copper oxide nanoparticle catalyst. The hollow carbon-coated copper oxide nano-particle catalyst with rich oxygen vacancies is effectively synthesized by utilizing the Kirkendall effect, due to the unique hollow structure and the rich oxygen vacancies, the maximum Faraday efficiency of ammonia of the catalyst is 94.2% under the potential of -0.2 V Vs RHE, the generation rate of ammonia reaches 487.8 mmol g<cat><-1> h<-1>, and the maximum Faraday efficiency of the catalyst is 94.2% under the potential of-0.2 V Vs RHE, and is about 2.4 times of the conversion rate of ammonia in the Haber-Bosch reaction.

Description

technical field [0001] The invention relates to the field of preparation of electrochemical reduction catalysts, in particular to a hollow carbon-coated copper oxide nanoparticle catalyst and its preparation method and application. Background technique [0002] Ammonia is not only a commonly used chemical raw material, but also an important new energy carrier. Industrial ammonia synthesis mainly focuses on the "N 2 -to-NH 3 "Converted Haber-Bosch reaction, but its reaction conditions are harsh, requiring high temperature and high pressure (350-550°C, 150-250atm). Normal temperature and pressure electrocatalytic reduction of nitrogen to ammonia, although it is expected to become a low-temperature substitute for the Haber-Bosch reaction, but Due to the low rate of ammonia production (usually less than 10 mmol g cat -1 h -1 ), the current density of ammonia production is small (less than 1mA cm -2 ) and the low selectivity of the ammonia production reaction make it diffic...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a hollow carbon-coated copper oxide nanoparticle catalyst and its preparation method and application, aiming at solving the problem of the low ammonia conversion rate of the existing electrochemical nitrate reduction catalyst The problem

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