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

doi:10.1016/S1872-2067(20)63673-7

Abstract

Abstract:

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,Nb-CoSe@NC) 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 Nb-CoSe@NC,dual,nonmetal doping was realized through gas sulfurization to prepare hierarchical Nb-CoSeS@NC. The prepared Nb-CoSeS@NC,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 Nb-CoSeS@NC. 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.

Key words: Nb, CoSeS, N-doped carbon nanosphere, Multi-doping, Hydrogen evolution reaction

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. Hierarchical CoSeS nanostructures assisted by Nb doping for enhanced hydrogen evolution reaction[J]. Chinese Journal of Catalysis, 2021, 42(3): 431-438.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63673-7

https://www.cjcatal.com/EN/Y2021/V42/I3/431

Figures/Tables 8

Scheme 1. Synthetic process for Nb-CoSeS@NC.

Fig. 1. XRD patterns of CoSe@NC,CoSeS@NC,Nb-CoSe@NC,and Nb-CoSeS@NC.

Fig. 2. Characterization of Nb-CoSeS@NC. XPS spectra of Nb 3d (a) and S 2p (b) regions of Nb-CoSeS@NC and Co 2p (c) and Se 3d (d) regions of CoSeS@NC and Nb-CoSeS@NC.

Fig. 3. Scanning electronic microscopy images of polymer nanospheres (a),NCs (b),Nb-CoSe@NC (c),and Nb-CoSeS@NC (d).

Fig. 4. TEM images of Nb‐CoSe@NC (a),Nb‐CoSeS@NC (b,c); (d)HRTEM images of Nb‐CoSeS@NC.

Fig. 5. SEM mapping of Nb-CoSeS@NC.

Fig. 6. HER performance of NC,CoSe@NC,CoSeS@NC,Nb-CoSe@NC,and Nb-CoSeS@NC. (a) IR-corrected LSV curves; (b) Tafel plots; (c) Nyquist plots; (d) determined double-layer capacitance values.

Fig. 7. Stability results of Nb-CoSeS@NC in 0.5 M H2SO4. (a) Chronoamperometry at a constant potential of -0.16 V vs RHE; (b) polarization curves before and after 1000 CV sweeps.

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