Monolithic FAPbBr3 photoanode for photoelectrochemical water oxidation with low onset-potential and enhanced stability

Hao Yang, Yawen Liu, Yunxuan Ding, Fusheng Li, Linqin Wang, Bin Cai, Fuguo Zhang, Tianqi Liu, Gerrit Boschloo, Erik M. J. Johansson () and Licheng Sun ()
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Hao Yang: KTH Royal Institute of Technology
Yawen Liu: Uppsala University
Yunxuan Ding: Westlake University
Fusheng Li: Dalian University of Technology
Linqin Wang: Westlake University
Bin Cai: Uppsala University
Fuguo Zhang: KTH Royal Institute of Technology
Tianqi Liu: KTH Royal Institute of Technology
Gerrit Boschloo: Uppsala University
Erik M. J. Johansson: Uppsala University
Licheng Sun: KTH Royal Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Despite considerable research efforts on photoelectrochemical water splitting over the past decades, practical application faces challenges by the absence of efficient, stable, and scalable photoelectrodes. Herein, we report a metal-halide perovskite-based photoanode for photoelectrochemical water oxidation. With a planar structure using mesoporous carbon as a hole-conducting layer, the precious metal-free FAPbBr3 photovoltaic device achieves 9.2% solar-to-electrical power conversion efficiency and 1.4 V open-circuit voltage. The photovoltaic architecture successfully applies to build a monolithic photoanode with the FAPbBr3 absorber, carbon/graphite conductive protection layers, and NiFe catalyst layers for water oxidation. The photoanode delivers ultralow onset potential below 0 V versus the reversible hydrogen electrode and high applied bias photon-to-current efficiency of 8.5%. Stable operation exceeding 100 h under solar illumination by applying ultraviolet-filter protection. The photothermal investigation verifies the performance boost in perovskite photoanode by photothermal effect. This study is significant in guiding the development of photovoltaic material-based photoelectrodes for solar fuel applications.

Date: 2023
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DOI: 10.1038/s41467-023-41187-9

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