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Water Oxidation under Modal Ultrastrong Coupling Conditions Using Gold/Silver Alloy Nanoparticles and Fabry–Pérot Nanocavities
Author(s) -
Suganami Yoshiki,
Oshikiri Tomoya,
Shi Xu,
Misawa Hiroaki
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202103445
Subject(s) - materials science , coupling (piping) , quantum efficiency , alloy , nanoparticle , photon , optoelectronics , faraday cage , electron , photoelectric effect , chemical engineering , photochemistry , nanotechnology , composite material , optics , magnetic field , chemistry , physics , engineering , quantum mechanics
We developed a photoanode consisting of Au‐Ag alloy nanoparticles (NPs), a TiO 2 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.