DataVXACS Energy LettersPaper
journal article·2024-09-13Open access

Activation of Nonoxide Photocatalyst Sheet Operable under Visible Light Irradiation up to 600 nm by Conductive Bilayer

Swarnava Nandy, Hiroka Sandaiji, Shuji Sekimori, Junie Jhon M. Vequizo, Rhauane Almeida Galvão, Natsutogi Iwasa, Swapnil S. Karade, Mamiko Nakabayashi, Tsuyoshi Takata, Takashi Hisatomi, Akira Yamakata, Kazunari Domen

ACS Energy Letters· Volume 9· Issue 9
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Source abstract

Abstract

Particulate photocatalyst sheets allow for scalable sunlight-driven overall water splitting. Photocatalyst sheets composed of doped-La 5 Ti 2 Cu 0.9 Ag 0.1 O 7 S 5 (LTCA), gallium zinc oxynitride (GaN:ZnO), and Au as the hydrogen evolution photocatalyst, oxygen evolution photocatalyst, and conductor layer, respectively, are promising candidates because of their long absorption edge wavelengths (700 and 600 nm, respectively). However, the actual performance of this sheet has been poor due to the large Schottky barrier at the GaN:ZnO/Au interface. Here, we developed a photocatalyst sheet incorporating conductive thin Au and thick Ti bilayer films having high and low work functions, respectively, which increased the activity by a factor of 6 compared with that of a single Au layer sheet. An optimized doped-LTCA/Au/Ti/CoO x /GaN:ZnO sheet modified with CoO x and Cr 2 O 3 /Rh cocatalysts exhibited a solar-to-hydrogen energy conversion efficiency of 0.3%. This work provides a key strategy based on the utilization of narrow bandgap oxynitride materials to construct efficient visible-light-driven nonoxide-based sheets.
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Research context

Catalysis & surfaces

OpenAlex topics: Advanced Photocatalysis Techniques · Copper-based nanomaterials and applications · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan

Graduate School of Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan

Graduate School of Medicine, Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan

Institute of Engineering Innovation, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Tokyo 113-8656, Japan

PRESTO, JST, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan

Graduate School of Natural Science and Technology

Okayama University

Institute for Aqua Regeneration, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan

Office of University Professors, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan

Department of Chemistry

Kyung Hee University

Funding

New Energy and Industrial Technology Development Organization · Precursory Research for Embryonic Science and Technology

References (19)

Show source-provided references
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