Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
The discovery of perovskite halides (ABX3 where B is Pb2+) has laid the foundation for a new class of semiconductors that showed outstanding optical and electronic properties. The optimal bandgap and efficient charge transfer kinetics of these materials have shown great potential in photovoltaics (solar cells, photodetectors) and photoelectrochemical energy conversion (solar fuels) devices. But despite their efficiency, the presence of lead and instability in ambient conditions can limit their applications. Hence, these issues need to be addressed before taking them to the applications. The use of halide double perovskites (Cs2AgMX6) is one of the options where Pb2+ when replaced by Ag+ (monovalent) and M3+ (trivalent) cation, will result in better tunability and long term stability in ambient conditions. Photocatalytic hydrogen evolution from aqueous HBr (or HBr/H3PO2) using Cs2AgBiBr6 has also been reported, by forming Cs2AgBiBr6 and reduced graphene oxide composites.
This work is focused on the use Cs2AgMCl6, as a photo-catalyst for water oxidation reactions. The electrochemical and photoelectrochemical studies were conducted on single crystals and polycrystalline films to understand the redox behaviour, optoelectronic features, and stability under applied potential, which will help to orchestrate the device architecture for photocatalytic and photovoltaic applications. In addition, the structural changes were also demonstrated in the oxidative and reductive environments using Fourier Transform Infrared Spectroscopy (FTIR). All these results were taken into account to propose suitable conditions for photoelectrochemical (PEC) water oxidation. The PEC studies of these materials were then carried out with and without IrOx (iridium oxide) cocatalyst, and the results for which confirmed enhancement in photocatalytic activity with the use of IrOx-cocatalyst deposited on the top of the perovskite layer, attributing to its catalytic activity and better charge transfer kinetics. This study will provide researchers with a roadmap to use halide double perovskites for solar water splitting and other photocatalytic applications.
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