Graphite-protected CsPbBr3 perovskite photoanodes functionalised with water oxidation catalyst for oxygen evolution in water

Isabella Poli, Ulrich Hintermair (), Miriam Regue, Santosh Kumar, Emma V. Sackville, Jenny Baker, Trystan M. Watson, Salvador Eslava () and Petra J. Cameron ()
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Isabella Poli: University of Bath
Ulrich Hintermair: University of Bath
Miriam Regue: University of Bath
Santosh Kumar: University of Bath
Emma V. Sackville: University of Bath
Jenny Baker: Swansea University Bay Campus
Trystan M. Watson: Swansea University Bay Campus
Salvador Eslava: University of Bath
Petra J. Cameron: University of Bath

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Metal-halide perovskites have been widely investigated in the photovoltaic sector due to their promising optoelectronic properties and inexpensive fabrication techniques based on solution processing. Here we report the development of inorganic CsPbBr3-based photoanodes for direct photoelectrochemical oxygen evolution from aqueous electrolytes. We use a commercial thermal graphite sheet and a mesoporous carbon scaffold to encapsulate CsPbBr3 as an inexpensive and efficient protection strategy. We achieve a record stability of 30 h in aqueous electrolyte under constant simulated solar illumination, with currents above 2 mA cm−2 at 1.23 VRHE. We further demonstrate the versatility of our approach by grafting a molecular Ir-based water oxidation catalyst on the electrolyte-facing surface of the sealing graphite sheet, which cathodically shifts the onset potential of the composite photoanode due to accelerated charge transfer. These results suggest an efficient route to develop stable halide perovskite based electrodes for photoelectrochemical solar fuel generation.

Date: 2019
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DOI: 10.1038/s41467-019-10124-0

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