2022 Fiscal Year Annual Research Report

高効率赤外光駆動水分解を可能とするプラズモニック光電極の開発

Research Project

Project/Area Number	21J15848
Research Institution	Kyoto University
Principal Investigator	LI HAN 京都大学, 理学研究科, 特別研究員(DC2)
Project Period (FY)	2021-04-28 – 2023-03-31
Keywords	Cu2-xSeyS1-y / plasmon / band engineering / water oxidation / hot carriers / Fermi level / electric field
Outline of Annual Research Achievements	In 2022, we designed a plasmonic photoelectrode comprising Cu2-xSeyS1-y and CdS for Near-Infrared (NIR)light driven water oxidation. We evaluated the performance of the photoelectrodes with band engineering of Cu2-xSeyS1-y which resulted in the optimized interfacial electric field between CdS and Cu2-xSeyS1-y. Cu2-xSeyS1-y with a deep fermi level (EF) showed good photoelectrocatalytic Oxygen evolution reaction (OER) activity under NIR light. We illustrated the hot carriers transfer by the transient absorption spectroscopy. Finally, we found that the band engineering of Cu2-xSeyS1-y controlled the NIR-induced photoelectrocatalytic OER. It was revealed that not only the deeper EF position but also the stronger interfacial electric field contributed to the photoelectrocatalytic OER.
Research Progress Status	令和4年度が最終年度であるため、記入しない。
Strategy for Future Research Activity	令和4年度が最終年度であるため、記入しない。