CaIn<sub>2</sub>O<sub>4</sub>/Fe-TiO<sub>2</sub> Composite Photocatalysts
with Enhanced Visible Light Performance for Hydrogen Production
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Abstract
A series
of CaIn<sub>2</sub>O<sub>4</sub>/Fe-TiO<sub>2</sub> composite photocatalysts
with tunable Fe-TiO<sub>2</sub> contents were prepared in which Fe-TiO<sub>2</sub> nanoparticles were uniformly deposited onto the surface of
CaIn<sub>2</sub>O<sub>4</sub> nanorods. The photocatalytic activities
of Pt-loaded CaIn<sub>2</sub>O<sub>4</sub>/Fe-TiO<sub>2</sub> composites
were evaluated for H<sub>2</sub> evolution from aqueous KI solution
under visible light irradiation. It was found that the composites
showed higher H<sub>2</sub> evolution rates in comparison with pure
CaIn<sub>2</sub>O<sub>4</sub> or Fe-TiO<sub>2</sub>, which could be
attributed to the increased surface area and enhanced visible light
absorption. A high H<sub>2</sub> evolution rate of 280 μmol
h<sup>–1</sup> g<sup>–1</sup> was achieved when the
mass ratio of Fe-TiO<sub>2</sub> to CaIn<sub>2</sub>O<sub>4</sub> was
0.5, which was 12.3 and 2.2 times higher than that of pure CaIn<sub>2</sub>O<sub>4</sub> and Fe-TiO<sub>2</sub>, respectively. Furthermore,
the interfaces between CaIn<sub>2</sub>O<sub>4</sub> nanorods and
Fe-TiO<sub>2</sub> nanoparticles facilitated efficient charge separation
that also led to the improved photocatalytic activity. This study
may provide some inspiration for the fabrication of visible-light-driven
photocatalysts with efficient and stable performance
