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Nano Research 2024, 17(6): 4864-4871 https://doi.org/10.1007/s12274-024-6470-3
Research Article | Issue | Published: 08 February 2024

Electron engineering of nickel phosphide for Niδ+ in electrochemical nitrate reduction to ammonia

Show Author's Information Jie Hu1,  Hao Huang2( ),  Miao Yu1,  Shuang Wang1,3( ),  Jinping Li3
College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China
School of Sustainable Energy Materials and Science, Jinhua Advanced Research Institute, Jinhua 321000, China
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China
Keywords:
metal-organic frameworks, transition metal phosphide, nitrate reduction, ammonia production, electron engineering
Topics:
Electrolytic reduction
Cite this article:
Hu J, Huang H, Yu M, et al. Electron engineering of nickel phosphide for Niδ+ in electrochemical nitrate reduction to ammonia. Nano Research, 2024, 17(6): 4864-4871. https://doi.org/10.1007/s12274-024-6470-3
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Abstract Full text Electronic supplementary material About this article

The electrochemical reduction of nitrate to ammonia (ENRA) provides an efficient approach to remove nitrate pollution and achieve ammonia production simultaneously. Herein, inspired by bio-enzyme in denitrifying bacteria, a carbon-coated nickel phosphide (NiPC) nanosheet derived from metal-organic frameworks (MOFs) is proposed as an efficient catalyst for ENRA. Through electron engineering, controllable Niδ+ in nickel phosphide is achieved by regulating the degree of phosphating, which enhances its activity for the hydrogenation of nitrate. As the result, Niδ+ becomes one of dominating factors determining the efficiency of the ENRA reaction in nickel phosphide. The optimal NiPC catalyst exhibits impressive property toward ENRA: NH4+ Faraday efficiency of 96.68%, NH4+ selectivity of 99.04%, and nitrate conversion rate of 90.43% under low nitrate concentration (200 mg·L−1). This work opens a new avenue for the design of next-generation catalysts through electron engineering for ENRA.


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Electronic supplementary material
About this article

Electron engineering of nickel phosphide for Niδ+ in electrochemical nitrate reduction to ammonia

Show Author's information Jie Hu1, Hao Huang2( ), Miao Yu1, Shuang Wang1,3( ), Jinping Li3
College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China
School of Sustainable Energy Materials and Science, Jinhua Advanced Research Institute, Jinhua 321000, China
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China

Abstract

The electrochemical reduction of nitrate to ammonia (ENRA) provides an efficient approach to remove nitrate pollution and achieve ammonia production simultaneously. Herein, inspired by bio-enzyme in denitrifying bacteria, a carbon-coated nickel phosphide (NiPC) nanosheet derived from metal-organic frameworks (MOFs) is proposed as an efficient catalyst for ENRA. Through electron engineering, controllable Niδ+ in nickel phosphide is achieved by regulating the degree of phosphating, which enhances its activity for the hydrogenation of nitrate. As the result, Niδ+ becomes one of dominating factors determining the efficiency of the ENRA reaction in nickel phosphide. The optimal NiPC catalyst exhibits impressive property toward ENRA: NH4+ Faraday efficiency of 96.68%, NH4+ selectivity of 99.04%, and nitrate conversion rate of 90.43% under low nitrate concentration (200 mg·L−1). This work opens a new avenue for the design of next-generation catalysts through electron engineering for ENRA.

Keywords: metal-organic frameworks, transition metal phosphide, nitrate reduction, ammonia production, electron engineering

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Publication history
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Acknowledgements

Publication history

Received: 04 November 2023
Revised: 24 December 2023
Accepted: 03 January 2024
Published: 08 February 2024
Issue date: June 2024

Copyright

© Tsinghua University Press 2024

Acknowledgements

Acknowledgements

The authors acknowledge the financial support of the National Natural Science Foundation of China (Nos. 22078215 and 22002083) and Research Project by Shanxi Scholarship Council of China (No. 2021-055).

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