Abstract:
Transition metal chalcogenides have intensively focused on photocatalytic hydrogen
production for a decade due to their stronger edge and the quantum confinement effect. This work
mainly focuses on synthesis and hydrogen production efficiencies of cobalt disulfide (CoS2)-embedded
TiO2 nanocomposites. Materials are synthesized by using a hydrothermal approach and the hydrogen
production efficiencies of pristine CoS2, TiO2 nanoparticles and CoS2/TiO2 nanocomposites are
compared under UV irradiation. A higher amount of hydrogen production (2.55 mmol g−1
) is
obtained with 10 wt.% CoS2/TiO2 nanocomposite than pristineTiO2 nanoparticles, whereas no
hydrogen production was observed with pristine CoS2 nanoparticles. This result unveils that the
metal dichalcogenide–CoS2 acts as an effective co-catalyst and nanocrystalline TiO2 serves as an
active site by effectively separating the photogenerated electron–hole pair. This study lays down a
new approach for developing transition metal dichalcogenide materials with significant bandgaps
that can effectively harness solar energy for hydrogen production.
