Flux‐Assisted Synthesis of Y2Ti2O5S2 for Photocatalytic Hydrogen and Oxygen Evolution Reactions

Author:

Lin Lihua1ORCID,Kaewdee Pongpen12,Nandal Vikas3,Shoji Ryota4,Matsuzaki Hiroyuki4,Seki Kazuhiko3,Nakabayashi Mamiko5,Shibata Naoya5,Tao Xiaoping1,Liang Xizhuang1,Ma Yiwen1,Hisatomi Takashi1,Takata Tsuyoshi1,Domen Kazunari16ORCID

Affiliation:

1. Research Initiative for Supra-Materials Interdisciplinary Cluster for Cutting Edge Research Shinshu University Nagano-shi Nagano 380-8553 Japan

2. Department of Chemistry Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

3. Global Zero Emission Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 16-1 Onogawa Tsukuba Ibaraki 305-8569 Japan

4. Research Institute for Material and Chemical Measurement National Metrology Institute of Japan (NMIJ) National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan

5. Institute of Engineering Innovation The University of Tokyo Tokyo 113-8656 Japan

6. Office of University Professors The University of Tokyo Tokyo 113-8656 Japan

Abstract

AbstractPhotocatalytic water splitting is an ideal means of producing hydrogen in a sustainable manner, and developing highly efficient photocatalysts is a vital aspect of realizing this process. The photocatalyst Y2Ti2O5S2 (YTOS) is capable of absorbing at wavelengths up to 650 nm and exhibits outstanding thermal and chemical durability compared with other oxysulfides. However, the photocatalytic performance of YTOS synthesized using the conventional solid‐state reaction (SSR) process is limited owing to the large particle sizes and structural defects associated with this synthetic method. Herein, we report the synthesis of YTOS particles by a flux‐assisted technique. The enhanced mass transfer efficiency in the flux significantly reduced the preparation time compared with the SSR method. In addition, the resulting YTOS showed improved photocatalytic H2 and O2 evolution activity when loaded with Rh and Co3O4 co‐catalysts, respectively. These improvements are attributed to the reduced particle size and enhanced crystallinity of the material as well as the slower decay of photogenerated carriers on a nanosecond to sub‐microsecond time range. Further optimization of this flux‐assisted method together with suitable surface modification is expected to produce high‐quality YTOS crystals with superior photocatalytic activity.

Funder

New Energy and Industrial Technology Development Organization

Publisher

Wiley

Subject

General Medicine

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