Promoting
the reconstruction of electrocatalysts during the oxygen
evolution reaction (OER) is generally regarded as a promising strategy
for enhanced activity. F anions with strong electronegativity are
predicted to enhance this transformation. Herein, a fluorine-anion
doping route is proposed to convert the well-latticed NiMoO4@MNF to amorphous F-NiMoO4@MNF by a facile and versatile
molten salt strategy. The well-defined nanorod arrays guarantee abundant
exposed active sites, rapid mass transfer, and fast gas bubble release.
Moreover, the emerged loose amorphous structure is conducive to the
dynamic migration of F species and effective penetration of the electrolyte;
therefore, the resulting exchange between F and hydroxide anions induces
the formation of an active oxy(hydroxide) layer, thus finally optimizing
the electronic structure and absorption/desorption energy on the surface
of F-NiMoO4@MNF. The boosted OER performance of reconstructed
F-NiMoO4@MNF is reliably confirmed by a low overpotential
of 188 mV at 50 mA cm–2, a small Tafel slope of
33.8 mV dec–1, and favorable long-term stability.
In addition, accelerated hydrogen evolution is observed, which is
ascribed to the finely tuned electron distribution. This work would
provide a new reconstruction route assisted by F-anion doping to the
development of high-performance catalysts.
Transition-metal sulfides (MxSy) have attracted keen interest as promising catalysts for hydrogen evolution reaction (HER) due to their low cost. However, the formation of sulfur-hydrogen bonds on MxSy (S-Hads) will...
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