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Detailed Analyses of Light Intensity Dependence to Uncover Multielectron Oxygen-Reduction Mechanism by Platinum-Loaded Tungsten(VI) Oxide

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Communication Open Access

Detailed Analyses of Light Intensity Dependence to Uncover Multielectron Oxygen-Reduction Mechanism by Platinum-Loaded Tungsten(VI) Oxide

Mai Takashima 1,2,*,† Chiharu Yamada 2 Bunsho Ohtani 1,2,‡
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1
Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
2
Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
*
Authors to whom correspondence should be addressed.
†
Present affiliation: School of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan
‡
Present affiliation: Nonprofit Organization Touche NPO, Sapporo 060-0004, Japan

Received: 07 November 2025 Revised: 17 December 2025 Accepted: 26 February 2026 Published: 09 March 2026

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© 2026 The authors. This is an open access article under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).

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Photocatal. Res. Potential 2026, 3(1), 10002; DOI: 10.70322/prp.2026.10002
ABSTRACT: Elucidation of the mechanism of multielectron transfer reactions, such as photocatalytic water oxidation and oxygen reduction, is essential for achieving high efficiency in the utilization of sustainable solar energy. Herein, we demonstrate that photocatalytic oxygen reduction on platinum-loaded tungsten(VI) oxide (Pt/WO3) photocatalyst proceeds predominantly by two-electron transfer pathway under conventional light-intensity conditions. Light intensity-dependence analyses of the acetic acid decomposition reaction revealed the role of the Pt co-catalyst in enhancing overall quantum efficiency. We also report for the first time that the reaction can be initiated even on bare WO3, in addition to Pt, under extremely high light-intensity conditions.
Keywords: Tungsten(VI) oxide; Platinum; Photocatalytic acetic-acid decomposition; Multielectron reactions; Light-intensity dependence; Kinetic model
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