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A strategy for highly dispersed Mo2C/MoN hybrid nitrogen-doped graphene via ion-exchange resin synthesis for efficient electrocatalytic hydrogen reduction

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Abstract

Molybdenum carbide/molybdenum nitride hybrid N-doped graphene (abbreviated as Mo2C/MoN/NG), as an efficient electrocatalyst for the hydrogen evolution reaction (HER), was synthesized via simple ion-exchange resin synthesis followed by a two-step annealing process, which increased the dispersion degree of the electrocatalyst’s active sites on the support skeleton and simplified the synthetic conditions. Additionally, N-doped graphene (NG) enhanced the electron transfer and reduced the inner resistance. The material has a graphene-like morphology and highly dispersed Mo2C/MoN nanoparticles about 2 nm in diameter on the NG. X-ray photoelectron spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy revealed that Mo2C/MoN/NG consisted of Mo2C and MoN composited together. Finally, Mo2C/MoN/NG exhibited remarkable performance as an electrocatalyst for the HER with a small overpotential of 78.82 mV and a small Tafel slope of 39.3 mV·dec−1 in a 0.5 mol·L−1 H2SO4 solution. Its activity was approximately 30% lower than that of 20% Pt/C and 60% higher than that of NG. Also, it exhibited a low onset overpotential of 24.82 mV, which is similar to the theoretical HER potential. Our work provides a foundation for advanced HER applications of molybdenum compounds.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 21373044), the Fundamental Research Funds for the Central Universities (No. 2412017FZ012), the Natural Science Foundation of Jilin Province (No. 20180101298JC), the Science and Technology Research Foundation of the Thirteenth Five Years of Jilin Educational Committee, the Technology Foundation for Selected Overseas Chinese Scholars of Personnel Ministry of China, Science and Technology Activities Project Preferential Funding for Selected Overseas Chinese Scholars of Jilin Province Human Resources and Social Bureau, and the Analysis and Testing Foundation of Northeast Normal University.

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  1. Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China

    Jiabo Wang, Weilin Chen, Ting Wang & Enbo Wang

  2. Autonomous Region Level Experimental Teaching Demonstration Center, Yili Normal University, Yining, 835000, China

    Nasen Bate

  3. Library of Northeast Normal University, Changchun, 130024, China

    Chunlei Wang

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  1. Jiabo Wang
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Correspondence to Weilin Chen or Enbo Wang.

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Wang, J., Chen, W., Wang, T. et al. A strategy for highly dispersed Mo2C/MoN hybrid nitrogen-doped graphene via ion-exchange resin synthesis for efficient electrocatalytic hydrogen reduction. Nano Res. 11, 4535–4548 (2018). https://doi.org/10.1007/s12274-018-2034-8

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