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Heterostructure Cu3P−Ni2P/CP catalyst assembled membrane electrode for high-efficiency electrocatalytic nitrate to ammonia

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Abstract

Electrochemical nitrate reduction reaction (NO3RR) is a promising means for generating the energy carrier ammonia. Herein, we report the synthesis of heterostructure copper-nickel phosphide electrocatalysts via a simple vapor-phase hydrothermal method. The resultant catalysts were evaluated for electrocatalytic nitrate reduction to ammonia (NH3) in three-type electrochemical reactors. In detail, the regulation mechanism of the heterogeneous Cu3P−Ni2P/CP−x for NO3RR performance was systematically studied through the H-type cell, rotating disk electrode setup, and membrane-electrode-assemblies (MEA) electrolyzer. As a result, the Cu3P−Ni2P/CP−0.5 displays the practicability in an MEA system with an anion exchange membrane, affording the largest ammonia yield rate (RNH3) of 1.9 mmol·h−1·cm−2, exceeding most of the electrocatalytic nitrate reduction electrocatalysts reported to date. The theoretical calculations and in-situ spectroscopy characterizations uncover that the formed heterointerface in Cu3P−Ni2P/CP is beneficial for promoting nitrate adsorption, activation, and conversion to ammonia through the successive hydrodeoxygenation pathway.

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Acknowledgements

This work was financially supported by the postdoctoral researcher funding project of Anhui Province (No. 2022B585), the HFIPS Director’s Fund (No. YZJJ2023QN29), the National Natural Science Foundation of China (No. 52172106), and the Special Research Assistant Program, Chinese Academy of Sciences.

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  1. Meng Jin and Jiafang Liu contributed equally to this work.

Authors and Affiliations

  1. Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China

    Meng Jin, Jiafang Liu, Shengbo Zhang, Wenyi Li, Dianding Sun, Yunxia Zhang, Guozhong Wang & Haimin Zhang

  2. University of Science and Technology of China, Hefei, 230026, China

    Meng Jin, Jiafang Liu, Shengbo Zhang, Wenyi Li, Dianding Sun, Yunxia Zhang, Guozhong Wang & Haimin Zhang

  3. Anhui Contango New Energy Technology Co., Ltd., Hefei, 230031, China

    Xian Zhang

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Heterostructure Cu3P−Ni2P/CP catalyst assembled membrane electrode for high-efficiency electrocatalytic nitrate to ammonia

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Jin, M., Liu, J., Zhang, X. et al. Heterostructure Cu3P−Ni2P/CP catalyst assembled membrane electrode for high-efficiency electrocatalytic nitrate to ammonia. Nano Res. (2024). https://doi.org/10.1007/s12274-024-6474-z

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