Improved All Inorganic CsPbBr3 Perovskite Photoanodes for Water Oxidation
Kaya Davies-Brenchley a b, Petra Cameron a, Ulrich Hintermair a, Jenny Baker c
a Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
b EPSRC Centre for Doctoral Training in New and Sustainable Photovoltaics
c Faculty of Science and Engineering, Swansea University, Bay Campus, Swansea, SA1 8EN, UK
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Kaya Davies-Brenchley, 268
Publication date: 20th April 2022

Inorganic metal-halide perovskite solar cells have attracted wide interest throughout the field. They possess a number of attractive features however, an increased stability to temperature, moisture and air, compared to organo-metal halide perovskites, is an area warranting further investigation.

CsPbBr3 inorganic PSCs, with carbon electrodes, can achieve impressive Voc values, reaching over 1.23 V, the standard potential for the oxidation of H2O. These PSCs have been encapsulated and placed in an aqueous electrolyte solution to achieve photoelectrochemical oxygen or hydrogen evolution. [1,2] In our work, we have encapsulated the PSCs using a commercially available graphite sheet, with a molecular Ir-based water oxidation catalyst (WOC) grafted onto the surface. [3]

We are investigating a number of possible approaches to improve water oxidation at the surface of the PSC. In particular, we have improved the encapsulation of the device, allowing for water oxidation to occur for over 140 h, producing currents well above 1 mA. Furthermore, alternative strategies for increasing the amount of the WOC bound to the surface of the photoanode have been studied, in order to increase the number of active sites available for water oxidation.

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