DataVXACS Applied Energy MaterialsPaper
journal article·2025-03-24Open access

Effects of Metal-Cation Doping on Photocatalytic H2 Evolution Activity of Layered Perovskite Oxynitride K2LaTa2O6N

Hideya Tsuchikado, Shuji Anabuki, Ovidiu Cretu, Yuki Kinoshita, Masashi Hattori, Yuta Shiroma, Dongxiao Fan, Megumi Okazaki, Takuto Soma, Fumitaka Ishiwari, Shunsuke Nozawa, Toshiyuki Yokoi, Michikazu Hara, Koji Kimoto, Akira Yamakata, Akinori Saeki, Kazuhiko Maeda

ACS Applied Energy Materials· Volume 8· Issue 6
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Abstract

High Resolution Image Download MS PowerPoint Slide Aliovalent cation doping into a heterogeneous photocatalyst affects several of its physicochemical properties, including its morphological characteristics, optical absorption behavior, and charge carrier dynamics, causing a drastic change in its photocatalytic activity. In the present work, we investigated the effects of aliovalent cation doping on the visible-light H 2 -evolution photocatalytic activity of the Ruddlesden–Popper layered perovskite oxynitride K 2 LaTa 2 O 6 N. The photocatalytic activity toward H 2 evolution from an aqueous NaI solution was found to be enhanced by an increase in the specific surface area of the K 2 LaTa 2 O 6 N photocatalyst, which could be realized upon doping with lower-valence cations (e.g., Mg 2+, Al 3+, and Ga 3+ ). Among the dopants examined at 1 mol % doping, Ga resulted in the highest activity. The activity of the Ga-doped specimen was further improved with increasing Ga concentration, where the maximal activity was obtained at 10 mol %, corresponding to an apparent quantum yield of 2.7 ± 0.4% at 420 nm from aqueous methanol. This number is the highest reported for a layered oxynitride photocatalyst. In the Ga-doped K 2 LaTa 2 O 6 N, a trade-off was observed between the Ga concentration and the photocatalytic activity. Although doping with Ga reduced the particle size of K 2 LaTa 2 O 6 N and suppressed undesirable charge recombination, it led to an enlarged bandgap, unsuitable for visible-light absorption.
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Research context

Electronic materialsCatalysis & surfaces

OpenAlex topics: Advanced Photocatalysis Techniques · Inorganic Chemistry and Materials · Perovskite Materials and Applications

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

Affiliations

Department of Chemistry, School of Science, Institute of Science Tokyo, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan

Electron Microscopy Group, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan

Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo, 2-12-1-S1-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Institute of Integrated Research, Institute of Science Tokyo, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan

Institute of Materials Structure Science High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565- 0871, Japan

Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 1-1 Yamadaoka, Suita, Osaka 565-0871, Japan

Japan Science and Technology Agency (JST)

PRESTO

Research Center for Autonomous Systems Materialogy (ASMat), Institute of Science Tokyo, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

Funding

Core Research for Evolutional Science and Technology · Japan Society for the Promotion of Science · Support for Pioneering Research Initiated by the Next Generation

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