Unassisted overall water splitting with a solar‐to‐hydrogen efficiency of over 10% by coupled lead halide perovskite photoelectrodes
Ryan Rhee,
Tae G. Kim,
Gyu Y. Jang,
Gwangmin Bae,
Jung H. Lee,
Sunje Lee,
Sungsoon Kim,
Seokwoo Jeon,
Jong H. Park
Affiliations
Ryan Rhee
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Tae G. Kim
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Gyu Y. Jang
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Gwangmin Bae
Department of Materials Science and Engineering, KAIST Institute for The Nanocentury (KINC) Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea
Jung H. Lee
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Sunje Lee
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Sungsoon Kim
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Seokwoo Jeon
Department of Materials Science and Engineering, KAIST Institute for The Nanocentury (KINC) Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea
Jong H. Park
Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea
Abstract Hydrogen is a promising future sustainable fuel candidate with boundless opportunities. Research into photoelectrochemical (PEC) water splitting based on a lead halide perovskite (LHP) has progressed significantly with the aim of more efficient solar hydrogen production. Herein, we unite a well‐known photo‐absorbing LHP with cost‐effective water‐splitting catalysts, and we introduce two types of monolithic LHP‐based PEC devices that act as a photocathode and a photoanode for the hydrogen evolution reaction and oxygen evolution reaction, leading to efficient unbiased overall water splitting. Through the integration of these two monolithic LHP‐based photoelectrodes, an unbiased solar‐to‐hydrogen conversion efficiency of 10.64% and a photocurrent density of 8.65 mA cm−2 are achieved.
