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Hexagonal boron nitride nanosheet for effective ambient N2 fixation to NH3

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Abstract

Industrial production of NH3 from N2 and H2 significantly relies on Haber–Bosch process, which suffers from high energy consume and CO2 emission. As a sustainable and environmentally-benign alternative process, electrochemical artificial N2 fixation at ambient conditions, however, is highly required efficient electrocatalysts. In this study, we demonstrate that hexagonal boron nitride nanosheet (h-BNNS) is able to electrochemically catalyze N2 to NH3. In acidic solution, h-BNNS catalyst attains a high NH3 formation rate of 22.4 μg·h–1·mg–1cat. and a high Faradic efficiency of 4.7% at–0.75 V vs. reversible hydrogen electrode, with excellent stability and durability. Density functional theory calculations reveal that unsaturated boron at the edge site can activate inert N2 molecule and significantly reduce the energy barrier for NH3 formation.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21575137, 21775089, and 21375076), the Key Research and Development Program of Shandong Province (No. 2015GSF121031) and the Natural Science Foundation Projects of Shandong Province (Nos. ZR2017JL010, ZR2017QB008, and ZR2017LEE006).

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  1. Ya Zhang and Huitong Du contributed equally to this work.

Authors and Affiliations

  1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Ya Zhang, Lei Ji, Hongyu Chen, Hong Huang & Xuping Sun

  2. College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China

    Huitong Du

  3. Analytical and Test Center, Southwest University of Science and Technology, Mianyang, 621010, China

    Yongjun Ma & Fengli Qu

  4. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    Haoran Guo, Ziqi Tian & Liang Chen

  5. College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China

    Guanwei Cui

  6. Chemistry Department, Faculty of Science & Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia

    Abdullah M. Asiri

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Correspondence to Fengli Qu, Liang Chen or Xuping Sun.

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Zhang, Y., Du, H., Ma, Y. et al. Hexagonal boron nitride nanosheet for effective ambient N2 fixation to NH3. Nano Res. 12, 919–924 (2019). https://doi.org/10.1007/s12274-019-2323-x

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