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MoC nanocrystals confined in N-doped carbon nanosheets toward highly selective electrocatalytic nitric oxide reduction to ammonia

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Abstract

Electrochemical nitric oxide reduction reaction (NORR) to produce ammonia (NH3) under ambient conditions is a promising alternative to the energy and carbon-intensive Haber-Bosch approach, but its performance is still improved. Herein, molybdenum carbides (MoC) nanocrystals confined by nitrogen-doped carbon nanosheets are first designed as an efficient and durable electrocatalyst for catalyzing the reduction of NO to NH3 with maximal Faradaic efficiency of 89% ± 2% and a yield rate of 1,350 ± 15 µg·h−1·cm−2 at the applied potential of −0.8 V vs. reversible hydrogen electrode (RHE) as well as high stable activity with negligible current density and NH3 yield rate decays over a 30 h continue the test. Moreover, as a proof-of-concept of Zn−NO battery, it achieves a peak power density of 1.8 mW·cm−2 and a large NH3 yield rate of 782 ± 10 µg·h−1·cm−2, which are comparable to the best-reported results. Theoretical calculations reveal that the MoC(111) has a strong electronic interaction with NO molecules and thus lowering the energy barrier of the potential-determining step and suppressing hydrogen evolution kinetics. This work suggests that Mo-based materials are a powerful platform providing great opportunities to explore highly selective and active catalysts for NH3 production.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Nos. 22075211, 22109118, 21601136, 51971157, and 51621003).

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Author notes

  1. Ge Meng, Mengmeng Jin, and Tianran Wei contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China

    Ge Meng

  2. Institute for New Energy Materials and Low-Carbon Technologies, Tianjin Key Lab for Photoelectric Materials & Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China

    Mengmeng Jin & Jun Luo

  3. MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resource, Environments and Materials, Guangxi University, Nanning, 530004, China

    Tianran Wei & Xijun Liu

  4. Institute for Advanced Study, Chengdu University, Chengdu, 610106, China

    Qian Liu

  5. College of Chemistry, Zhengzhou University, Zhengzhou, 450000, China

    Shusheng Zhang

  6. Institute of Zhejiang University-Quzhou, Quzhou, 324000, China

    Xianyun Peng

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  1. Ge Meng
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Correspondence to Ge Meng, Xianyun Peng or Xijun Liu.

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MoC nanocrystals confined in N-doped carbon nanosheets toward highly selective electrocatalytic nitric oxide reduction to ammonia

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Meng, G., Jin, M., Wei, T. et al. MoC nanocrystals confined in N-doped carbon nanosheets toward highly selective electrocatalytic nitric oxide reduction to ammonia. Nano Res. 15, 8890–8896 (2022). https://doi.org/10.1007/s12274-022-4747-y

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