2024-03-28T19:16:19Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/824962022-11-17T02:08:08Zhdl_2115_20057hdl_2115_148Water Oxidation under Modal Ultrastrong Coupling Conditions Using Gold/Silver Alloy Nanoparticles and Fabry-Perot NanocavitiesSuganami, Yoshiki1000060704567Oshikiri, Tomoya1000020749113Shi, Xu1000030253230Misawa, Hiroakimetadata only accessmodal strong couplingnanostructuresphotochemistrysurface plasmon resonancewater oxidation430We developed a photoanode consisting of Au-Ag alloy nanoparticles (NPs), a TiO2 thin film and a Au film (AATA) under modal strong coupling conditions with a large splitting energy of 520 meV, which can be categorized into the ultrastrong coupling regime. We fabricated a photoanode under ultrastrong coupling conditions to verify the relationship between the coupling strength and photoelectric conversion efficiency and successfully performed efficient photochemical reactions. The AATA photoanode showed a 4.0 % maximum incident photon-to-current efficiency (IPCE), obtained at 580 nm, and the internal quantum efficiency (IQE) was 4.1 %. These results were attributed to the high hot-electron injection efficiency due to the larger near-field enhancement and relatively negative potential distribution of the hot electrons. Furthermore, hybrid mode-induced water oxidation using AATA structures was performed, with a Faraday efficiency of more than 70 % for O-2 evolution.Wiley-Blackwell2021-08-16engjournal articleNAhttp://hdl.handle.net/2115/82496https://doi.org/10.1002/anie.2021034451433-7851Angewandte chemie-international edition60341843818442