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Hierarchical CoSeS nanostructures assisted by Nb doping for enhanced hydrogen evolution reaction

Metal doping for active sites exhibits remarkable potential for improving the hydrogen evolution reaction (HER). Multi-doping and the use of a conductive substrate can further modulate catalytic performance. Herein, Nb-CoSe well dispersed in N-doped carbon nanospheres (NCs, [email protected]) was synthesized to serve as a conductive substrate and facilitated good dispersion of active sites for the HER. Nb doping can also change the electronic structure of CoSe, which facilitates the activity for the HER. In order to further improve the conductivity and intrinsic activity of [email protected], dual, nonmetal doping was realized through gas sulfurization to prepare hierarchical [email protected] The prepared [email protected], with a core-shell structure, exhibited a low overpotential of 115 mV at 10 mA cm?2, which is smaller than that of the most doped catalysts. In addition, NCs not only improved the dispersion and conductivity of the catalyst but also prevented metal corrosion in an electrolyte, thus facilitating the long-term stability of [email protected] Moreover, the synergistic effect of the multi-doping of Nb, S, and Se was explained. This work provides a promising, multi-doping strategy for the large-scale application of transition-metal-based electrocatalysts for the HER.

» Author: Ya-Nan Zhou, Yu-Ran Zhu, Xin-Tong Yan, Yu-Ning Cao, Jia Li, Bin Dong, Min Yang, Qing-Zhong Li, Chen-Guang Liu, Yong-Ming Chai

» Publication Date: 01/03/2021

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