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

Metal doping for active sites exhibits remarkable potential improving the hydrogen evolution reaction (HER). Multi-doping and 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 facilitated good dispersion HER. Nb also change electronic structure CoSe, which facilitates activity In order improve conductivity intrinsic Nb-CoSe@NC, dual, nonmetal realized through gas sulfurization prepare hierarchical Nb-CoSeS@NC. The prepared Nb-CoSeS@NC, with core-shell structure, exhibited low overpotential 115 mV at 10 mA cm–2, is smaller than that most doped catalysts. addition, NCs not only improved catalyst but prevented metal corrosion an electrolyte, thus facilitating long-term stability Moreover, synergistic effect multi-doping Nb, S, Se explained. This work provides promising, strategy large-scale application transition-metal-based electrocatalysts