Electrochemical synthesis of ammonia from nitric oxide using a copper–tin alloy catalyst

Jiaqi Shao, Huijuan Jing, Pengfei Wei, Xiaoyan Fu, Long Pang, Yanpeng Song, Ke Ye, Mingrun Li, Luozhen Jiang, Jingyuan Ma, Rongtan Li, Rui Si, Zhangquan Peng, Guoxiong Wang () and Jianping Xiao ()
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Jiaqi Shao: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Huijuan Jing: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Pengfei Wei: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Xiaoyan Fu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Long Pang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yanpeng Song: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Ke Ye: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Mingrun Li: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Luozhen Jiang: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Jingyuan Ma: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Rongtan Li: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Rui Si: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Zhangquan Peng: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Guoxiong Wang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Jianping Xiao: Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Nature Energy, 2023, vol. 8, issue 11, 1273-1283

Abstract: Abstract Alternative routes to the Haber–Bosch process are being sought to electrify ammonia synthesis. Nitric oxide can be electrocatalytically converted into ammonia, but the Faradaic efficiencies and rates of production are currently far below those needed for industrial application. Here we report a rationally designed copper–tin alloy that is highly active in the synthesis of ammonia from nitric oxide. The rate of ammonia production in a flow cell reached 10 mmol cm−2 h−1 with a Faradaic efficiency of >96% at a current density >1,400 mA cm−2, and it remained stable at >600 mA cm−2 with an ammonia Faradaic efficiency of ~90% for 135 h. The rate of ammonia production in a scaled-up electrolyser comprising a membrane electrode assembly reached ~2.5 mol h−1 with a current of 400 A at ~2.6 V. We attribute the high ammonia production rate to the enhanced intrinsic activity of the alloy; the kinetic barriers of protonation are invariably low over a range of Cu6Sn5-derived surface structures.

Date: 2023
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DOI: 10.1038/s41560-023-01386-6

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