Publication date: 2nd November 2020
Bismuth vanadate (BiVO4) is one of the well-established photoanode for photoelectrochemical (PEC) water oxidation due to its visible light absorption, long hole diffusion length, and stability in near-neutral pH electrolytes making it superior over other metal oxide photoanodes. The major challenges with BiVO4 are light loss above 520 nm, recombination of photogenerated electrons and holes, and sluggish water oxidation rate. Traditionally, heterojunction has been formed by BiVO4 and other metal oxide semiconductors having higher bandgap which can enhance the charge separation leading to a reduction in recombination rate. We introduced vacancy ordered halide perovskite Cs2PtI6 as a second junction which enhanced the charge separation as well as light harvesting efficiency of the junction by absorbing light up to 950 nm. The BiVO4-Cs2PtI6 heterojunction displayed higher current density than bare BiVO4 at 1.23 V vs RHE. We also compared the performance of heterojunction after adding water oxidation catalyst IrOx. The photocurrent density is found to be doubled after the introduction of IrOx.
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