泡沫镍负载CuO纳米花的构筑及电化学硝酸根还原制氨的性能

doi:10.11896/cldb.23010042

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Abstract Electrochemical nitrate reduction to ammonia (NRA) could realize the green synthesis of ammonia and remove nitrate pollutant through electrochemical pathways by using nitrate and water as sources of nitrogen and hydrogen, respectively, which is of significance for alleviating energy crisis and environmental problems. However, nitrate to ammonia is a complex eight-electron transfer process accompanied by intense hydrogen evolution side reactions, which seriously limits the selectivity and Faraday efficiency of ammonia synthesis. Therefore, nickel foam-supported copper oxide nanoflower catalyst was prepared by hydrothermal synthesis and subsequent heat treatment process, and its electrocatalytic performance for nitrate reduction to ammonia was explored. By adjusting the synthesis conditions such as the ratio of copper nitrate to urea and pyrolysis temperatures, the uniform CuO nanoflowers loaded on nickel foam (NF) was achieved. The results show that when n(Cu(NO₃)₂)∶n(CO(NH₂)₂) is 1∶6, the obtained target catalyst (CuO-6@NF) shows the best performance in terms of Faraday efficiency, NH₃ yield, selectivity and nitrate conversion. At -0.23 V vs. RHE, the yield of CuO-6@NF ammonia reached 1.15 mmol·h^-1·cm^-2, the selectivity was 89.36%, and the removal rate of total nitrogen was as high as 96.71%. In addition, the catalyst exhibits good reproducibility, high stability, and applicability over a wide range of concentrations.

Key words： nitrate reduction ammonia production electrocatalysts CuO nanoflower heterostructure

Published: 25 May 2024 Online: 2024-05-28

CLC number:

TQ151

Fund:Natural Science Foundation of Jiangsu Province (BK20200991).

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	Articles by authors
	HUANG Shunyuan
	LIU Lyufei
	GU Yunjie
	GE Shuaichen
	LI Jingsha

Cite this article:

HUANG Shunyuan,LIU Lyufei,GU Yunjie, et al. Construction of Nickel Foam Supported CuO Nanoflower Composite and Its Property of Electrochemical Nitrate Reduction to Ammonia[J]. Materials Reports, 2024, 38(10): 23010042-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23010042 OR http://www.mater-rep.com/EN/Y2024/V38/I10/23010042

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