Citation: Kun Chen, Wei Zhang, Yu Bai, Wanbing Gong, Ning Zhang, Ran Long, Yujie Xiong. Boosting electrochemical hydrogen evolution by coupling anodically oxidative dehydrogenation of benzylamine to benzonitrile[J]. Chinese Chemical Letters, ;2023, 34(3): 107319. doi: 10.1016/j.cclet.2022.03.042 shu

Boosting electrochemical hydrogen evolution by coupling anodically oxidative dehydrogenation of benzylamine to benzonitrile

Kun Chen ^a ,
Wei Zhang ^{b, *,} ,
Yu Bai ^a ,
Wanbing Gong ^a ,
Ning Zhang ^{c, *,} ,
Ran Long ^{a, *,} ,
Yujie Xiong ^{a, d, *,}

a.
School of Chemistry and Materials Science, Frontiers Science Center for Planetary Exploration and Emerging Technologies, National Synchrotron Radiation Laboratory, and Experimental Center of Engineering and Material Sciences, University of Science and Technology of China, Hefei 230026, China
b.
Key Laboratory of Magnetic Materials at Universities of Inner Mongolia Autonomous Region, Baotou Teachers' College, Baotou 014030, China
c.
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China
d.
Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China

zw@bttc.edu.cn

nzh818@mail.ustc.edu.cn

longran@ustc.edu.cn

yjxiong@ustc.edu.cn

Received Date: 26 January 2022
Revised Date: 28 February 2022
Accepted Date: 10 March 2022
Available Online: 13 March 2022

Figures(4)

The electricity-driven water splitting acts as a promising pathway for renewable energy conversion and storage, yet anodic oxygen evolution reaction (OER) largely hinders its efficiency. Seeking the alternatives to OER exhibits the competitive advance to address this predicament. In this work, we show a more thermodynamically and kinetically favorable reaction, electrochemical oxidative dehydrogenation (EODH) of benzylamine to replace the conventional OER, catalyzed by a cobalt cyclotetraphosphate (Co₂P₄O₁₂) nanorods catalyst grown on nickel foam. This anodic reaction lowers the electricity input of 317 mV toward the desired current density of 100 mA/cm², together with a highly selective benzonitrile product of more than 97%. More specifically, when coupling it with cathodic hydrogen evolution reaction (HER), the proposed HER||benzylamine-EODH configuration only requires a cell voltage of 1.47 V@100 mA/cm², exhibiting an energy-saving up to 17% relative to conventional water splitting, as well as the near unit selectivity toward cathodic H₂ and anodic benzonitrile products.
- Electrosynthesis,
- Benzylamine dehydrogenation,
- Coupling,
- Hydrogen evolution,
- Cobalt cyclotetraphosphate
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