In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC)
Kurzfassung:
Transition metal alloys composed of earth-abundant elements have received increasing attention as promising catalysts for alkaline hydrogen evolution reactions (HER). However, exploring solutions to further improve the catalytic performance of transition metal alloys and solve the problems of agglomeration and dissolution in an alkaline medium still remain a serious challenge. In this work, the three-dimensional NiCo/V2O3/C nanosheets were synthesized by a one-step hydrothermal method and sequentially thermal reduction, which formed a Mott-Schottky heterojunction between NiCo alloy and V2O3 to enhance charge transport and greatly improve the alkaline HER. Moreover, the introduction of the graphitic carbon layer of the graphite phase as the support of the heterostructure solves the inherent shortcomings of the alloys, greatly strengthens the stability, and provides a necessary guarantee for the realization of industrial applications. Consequently, it achieved remarkable HER catalytic activity with ultralow overpotentials of 23 and 396 mV to drive current densities of 10 mA, and 1000 mA cm2 in 1 M KOH, respectively. DFT calculation indicates that the heterogeneous interface simultaneously optimizes the free energy of hydrogen adsorption and H2O adsorption energy, and promotes the kinetics of HER reaction. More importantly, it also demonstrated excellent durability in constant current tests at a current density of 1000 mA cm2 in KOH, illustrating its great potential for industrial application.
Materialart:
Online-Ressource
ISSN:
2050-7488
,
2050-7496
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2023
ZDB Id:
2702232-8
