期刊
SMALL STRUCTURES
卷 4, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/sstr.202200308
关键词
adsorption ability; ammonia synthesis; Au; Cu; catalysts; nitrate; nitrite reduction reactions
The traditional method for synthesizing NH3 is inefficient and causes pollution, while electrochemical synthesis through nitrate reduction is a promising alternative. A new Au/Cu catalyst is introduced for nitrate reduction to NH3, which demonstrates high yield rate and Faradaic efficiency. Unlike other catalysts, Au/Cu exhibits better activity for nitrate reduction than nitrite reduction due to enhanced adsorption capabilities and lower energy barriers.
The traditional method for synthesizing NH3 is the Haber-Bosch process which results in high-fuel consumption and environmental pollution. Therefore, ecofriendly electrochemical synthesis of NH3 through nitrate (NO3-) reduction is a good choice. Herein, an integral Au/Cu electrode to catalyze NO3- reduction to NH3 is introduced. The catalyst exhibits not only the highest NH3 yield rate (73.4 mg h(-1) cm(-2)) up to now but also a very high Faradaic efficiency of 98.02% at -0.7 V at room temperature. It is commonly believed that the transformation of NO3- to nitrite (NO2-) is an obstacle to the NH3 generation from NO3- reduction. Surprisingly, unlike most of the other catalysts, Au/Cu exhibits better activity for NO3- reduction than that for NO2- reduction. Based on the detailed experimental and density functional theory calculations, the excellent performance of Au/Cu for selective NO3- reduction lies in the enhanced adsorption capabilities of Au/Cu to NO3- in the alkaline environment and the lower energy barriers of the electrochemical reduction reaction.
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