Electrochemical Nitrogen Reduction Kinetics on a Copper Sulfide Catalyst for NH3 Synthesis at Low Temperature and Atmospheric Pressure

Title
Electrochemical Nitrogen Reduction Kinetics on a Copper Sulfide Catalyst for NH3 Synthesis at Low Temperature and Atmospheric Pressure
Authors
장종현허가현박현서박희영김민석공지민라마비 피트라김한성
Keywords
전기화학; 촉매; 암모니아; 수소; 타펠
Issue Date
2021-06
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 13-24603
Abstract
We studied the electrochemical synthesis of NH3 on Fe-CuS/C catalysts in an alkaline aqueous solution under ambient conditions. The metal chalcogenide catalyst is active in the nitrogen reduction reaction (NRR) for approximately 45 min with an NH3 production yield of 16 μg h-1 cm-2 at -0.4 VRHE, while it decomposes to CuO. The rapid degradation of the catalyst hinders the precise investigation of the NH3 production activity in longer time measurements. Herein, the electrochemical NH3 production rate is enhanced with increased overpotentials when the degradation effect is mitigated in the measurement, which was difficult to observe in the NRR reports. In the Tafel analysis, the exchange current density, heterogeneous rate constant, and transfer coefficient of the Fe-CuS/C catalyst on the NRR were estimated. When the electrode degradation is mitigated, one of the best NH3 production activities among the reported metal sulfide electrochemical NRR catalysts is obtained, which is 42 μg h-1 cm-2 at -0.6 VRHE.
URI
http://pubs.kist.re.kr/handle/201004/73178
ISSN
1944-8244
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KIST Publication > Article
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