Abstract
A facile two-step hydrothermal approach is adopted to synthesize MoSe2/N-doped RGO (NG) composites with the N/C atomic percentage changing from 1.13 to 5.16 at%. In the composites, nanoclusters of MoSe2 nanosheets are dispersed on plicated NG nanosheets. The electrochemical measurement suggests that the MoSe2/NG composites exhibit enhanced electro-catalytic HER activity as compared to MoSe2 and MoSe2/RGO. Moreover, as the N/C ratio of NG is increased, the activity of MoSe2/NG increases firstly and then decreases. At low N/C ratio, the impact of interfacial energy barrier between MoSe2 and NG is negligible and the electron transfer is substantial, so the activity of the MoSe2/NG composites increases with carrier concentration in NG. However, at high N/C ratio, the energy barrier blocks the electron transfer from NG to MoSe2 remarkably. Consequently, the MoSe2/NG composites with an intermediate N/C ratio have the highest activity. Owing to the synergistic effect of NG and MoSe2, the Tafel slope of the composites is reduced from 114.69 to 78.45 mV dec−1 by 32% as compared to pure MoSe2. The results provide us valuable information for efficient design of transition metal dichalcogenide catalysts for electro-catalytic hydrogen evolution.








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Acknowledgements
This work was jointly supported by National Natural Science Foundation of China (Grant Nos. 51471130, 51771144, 51501012, 51601142), Natural Science Foundation of Shaanxi Province (No.2017JZ015),the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201708), and Fundamental Research Funds for the Central Universities.
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Zhang, L., Sun, L., Huang, Y. et al. Hydrothermal synthesis of N-doped RGO/MoSe2 composites and enhanced electro-catalytic hydrogen evolution. J Mater Sci 52, 13561–13571 (2017). https://doi.org/10.1007/s10853-017-1417-7
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DOI: https://doi.org/10.1007/s10853-017-1417-7