Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.137
Publication date: 18th July 2023
Halide perovskites received significant attention in the photovoltaic community owing to its higher power conversion efficiency, high absorption coefficient, and bandgap tunability. However, their stability in aqueous medium is poor making them unsuitable to employ for direct water splitting. Various protective layers coupled with halide perovskite are utilized to prevent the exposure of the absorber to aqueous medium. However, these protective layers are susceptible to failure with prolonged operation. So, employing a water stable absorber material is found to be the key for successful photoelectrochemical (PEC) water splitting.
Vacancy ordered double perovskites with the formula A2BX6 are a promising alternative to conventional ABX3 perovskites due to excellent stability, comparable absorption coefficient and bandgap tunability. This class of materials have their alternate octahedra being vacant enabling a wider range of B-site elements due to rotational freedom. Here, we have reported the most stable vacancy ordered halide perovskite Cs2PtCl6 and Cs2PtBr6 which showed extraordinary stability in air and even in extreme acidic and basic mediums. Furthermore, these materials exhibit absorption properties that encompass a substantial portion of visible light. The capability of the material to undergo anion exchange from Cs2PtCl6 to Cs2PtBr6 via core-shell mechanism to form Type-II heterostructure is demonstrated. These materials are successfully employed as photoanode for PEC water oxidation which displayed photocurrent density of >0.2 mA/cm2 at 1.23 V vs. RHE.
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