Developing
active, durable, and inexpensive electrocatalysts is
critical for hydrogen production to meet ever-growing sustainable
energy needs. Nickel sulfides offer significant potential as electrocatalysts
for a hydrogen evolution reaction (HER); however, the active phase
governing the electrochemical conversion is still under debate. We
show that mesoporous thin-film NiS2 synthesized by a novel
soft-templating method without post-sulfurization exhibits superior
HER activity in alkaline media after a preconditioning step that results
in sulfur leaching, amorphization of the surface, and collapse of
the mesoporous structure. A comparative analysis with crystalline
NiS2 reveals that partial hydroxylation of the under-coordinated
Ni sites is responsible for the superior HER activity.
In this study, the one-step electrochemical preparation of chlorine doped and chlorine-oxygen containing functional group doped graphene-based powders was carried out by Yucel's method, with the resultant materials used as anode materials for lithium (Li)-ion batteries.
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