Metal-modified
crystal lattices have shown substantial promise
for increasing conductivity and electrocatalytic activity in metal
selenides. Nonetheless, the search for an appropriate dopant that
can precisely adjust its electronic structure for an effective hydrogen
evolution reaction (HER) remains a formidable task. In this report,
we explore indium (In3+) as a highly efficient candidate
for FeSe2 through the single-step hydrothermal method.
The successful formation of the catalyst was revealed by X-ray diffractography,
electron microscopy, and X-ray photoelectron spectroscopy. By taking
advantage of synergistic effects arising from the presence of bimetallic
components, the optimized electrocatalyst In0.2Fe0.8Se2 showcases exceptional performance and remarkable durability
for the HER. It displays a significantly low overpotential of 158
mV to achieve a current density of 10 mA cm–2, with
a low Tafel slope of 74 mV dec–1. This underscores
the immense promise of In0.2Fe0.8Se2 in the realm of water electrolysis.