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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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Publication history

Received: 23 November 2018
Revised: 13 January 2019
Accepted: 29 January 2019
Published: 07 March 2019
Issue date: April 2019

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Acknowledgements

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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Email: nanores@tup.tsinghua.edu.cn

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