Abstract
Hydrogen is gaining significant attention as a clean fuel option due to its high energy density, which can be produced through solar water splitting. In this study, S-TiO2 photocatalyst has been synthesized using the sol-gel method. Analysis revealed that cation substitution S+4 and S+6 of Ti+4 in the TiO2 lattice resulted in the formation of S=O bond and S-Ti-O bond. The S-TiO2 was then coated with BiSbS3 using the chemical bath deposition (CBD) method, followed by the deposition of FeOOH using the similar technique. The resulting photoelectrode, S-TiO2/BiSbS3/FeOOH, exhibited a photocurrent density of 4.36 mA.cm−2 at 1.23 V vs reverse hydrogen electrode and a solar-to-hydrogen efficiency of 1.31% at 0.6 V vs RHE, outperforming other electrodes. The improved photoactivity was attributed to the synergetic effect of heterojunction and cocatalyst loading. This study provides insight into the potential applications of cocatalysts in (photoelectrochemical) PEC water splitting.
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