Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Photoelectrochemical (PEC) water splitting is one technology to produce clean hydrogen fuel from abundant sunlight and water. To fabricate an efficient and stable photoelectrode for PEC water splitting, a multilayer structure, consisting of a protection layer (e.g., TiO2) and a catalyst layer (e.g., Pt), is generally required. However, despite the importance of understanding the photo-physics underlying these multilayer photoelectrodes, the detailed analysis of them under operando condition is challenging due to the complexity of the device structures. In this talk, we demonstrate the versatility of the electrochemical impedance spectroscopy (EIS) method for investigating multi-layered photocathodes for PEC water splitting. By carefully analyzing the EIS data of various photocathodes with different classes of light absorbers, such as metal chalcogenide (Sb2Se3), metal oxide (Cu2O), and crystalline Si, we were able to obtain information about the constituent semiconductors such as carrier lifetimes, doping densities, flat band potentials, and charge transfer rate constant under operando conditions. The EIS analysis presented in this study has made significant progress in establishing proper EIS models describing the realistic photo-physical behavior in complex multi-layered photocathodes.
This work was supported by a Basic Science Research Program through the National Research Foundation (NRF) funded by the Korean Ministry of Education (2019R1A6A3A03032834), the Swiss National Science Foundation (Project # 184737), and a postdoctoral Forschungskredit of the University of Zurich grant no. [FK-19-117)].
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