Volume 64, Issue 28 e202508617
Research Article

Interfacial Water Structure Modulation on Unconventional Phase Non-Precious Metal Alloy Nanostructures for Efficient Nitrate Electroreduction to Ammonia in Neutral Media

Yunhao Wang

Yunhao Wang

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

These authors contributed equally to this work.

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Fengkun Hao

Fengkun Hao

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

These authors contributed equally to this work.

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Hongming Xu

Hongming Xu

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Department of Chemical and Biological Engineering, Energy Institute, The Hong Kong University of Science and Technology, Hong Kong, 999077 China

These authors contributed equally to this work.

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Mingzi Sun

Mingzi Sun

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077 China

These authors contributed equally to this work.

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Xixi Wang

Xixi Wang

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Yuecheng Xiong

Yuecheng Xiong

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Jingwen Zhou

Jingwen Zhou

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Fu Liu

Fu Liu

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Yubing Hu

Yubing Hu

Institute of Molecular Plus, Department of Chemistry, Tianjin University, Tianjin, 300072 China

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Yangbo Ma

Yangbo Ma

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Xiang Meng

Xiang Meng

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Liang Guo

Liang Guo

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Chaohui Wang

Chaohui Wang

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Mingzheng Shao

Mingzheng Shao

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Guozhi Wang

Guozhi Wang

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Juan Wang

Juan Wang

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Pengyi Lu

Pengyi Lu

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Jinwen Yin

Jinwen Yin

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

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Jie Wang

Jie Wang

Key Laboratory of Fluid and Power Machinery of Ministry of Education, School of Materials Science and Engineering, Xihua University, Chengdu, Sichuan, 610039 China

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Prof. Wenxin Niu

Prof. Wenxin Niu

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

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Prof. Chenliang Ye

Prof. Chenliang Ye

Department of Power Engineering, North China Electric Power University, Baoding, Hebei, 071003 China

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Prof. Qinghua Zhang

Prof. Qinghua Zhang

Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190 China

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Prof. Shibo Xi

Prof. Shibo Xi

Institute of Sustainability for Chemicals, Energy and Environment, Agency for Science, Technology and Research (A*STAR), Singapore, 627833 Singapore

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Prof. Bolong Huang

Corresponding Author

Prof. Bolong Huang

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077 China

E-mail: [email protected]; [email protected]; [email protected]

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Prof. Minhua Shao

Corresponding Author

Prof. Minhua Shao

Department of Chemical and Biological Engineering, Energy Institute, The Hong Kong University of Science and Technology, Hong Kong, 999077 China

Guangzhou Key Laboratory of Electrochemical Energy Storage Technologies, Fok Ying Tung Research Institute, The Hong Kong University of Science and Technology, Guangzhou, 511458 China

E-mail: [email protected]; [email protected]; [email protected]

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Prof. Zhanxi Fan

Corresponding Author

Prof. Zhanxi Fan

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon, Hong Kong, 999077 China

Hong Kong Institute for Clean Energy (HKICE), City University of Hong Kong, Hong Kong, 999077 China

City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057 China

E-mail: [email protected]; [email protected]; [email protected]

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First published: 05 May 2025
Citations: 4

Graphical Abstract

The controlled synthesis of noble metal-free CuNi alloy nanostructures with unconventional hcp/fcc heterophase has been successfully achieved. Notably, hcp/fcc CuNi nanoalloys demonstrate much superior catalytic performance toward ammonia electrosynthesis from nitrate than the common fcc CuNi counterparts. Mechanism studies reveal that the hcp/fcc CuNi alloys facilitate the formation of K+–H2O, enhance the interfacial water dissociation, and create high *H coverage, thereby boosting the ammonia synthesis.

Abstract

Electrocatalytic nitrate reduction reaction (NO3RR) has been recognized as a sustainable route for nitrate removal and value-added ammonia (NH3) synthesis. Regulating the surface active hydrogen (*H) behavior is crucial but remains a formidable challenge, especially in neutral electrolytes, greatly limiting the highly selective NH3 formation. Herein, we report the controlled synthesis of heterophase hcp/fcc non-precious CuNi alloy nanostructures for efficient NH3 electrosynthesis in neutral media. Significantly, hcp/fcc Cu10Ni90 exhibits excellent performance with NH3 Faradaic efficiency and yield rate of 98.1% and 57.4 mg h−1 mgcat−1, respectively. In situ studies suggest that the high proportion of interfacial K+ ion hydrated water (K+–H2O) on hcp/fcc Cu10Ni90 creates high *H coverage via boosting interfacial water dissociation, enabling the rapid hydrogenation kinetics for NH3 synthesis. Theoretical calculations reveal that the superior NO3RR performance of hcp/fcc Cu10Ni90 originates from both the existence of hcp phase to improve the electroactivity and the high Ni content to guarantee an efficient active hydrogen supply. The strong interaction between Ni and Cu also optimizes the electronic structures of Cu sites to realize fast intermediate conversions with low energy barriers. This work provides a novel strategy to optimize surface *H behavior via tuning interfacial water structure by crystal phase control.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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