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X-Shaped α-FeOOH with Enhanced Charge Separation for Visible-Light-Driven Photocatalytic Overall Water Splitting

By Tianqi Wang, Zhifeng Jiang, Ka Chu, Dan Wu, Bo Wang, Hongli Sun, Ho Yip, Taicheng An, Huijun Zhao and Po Wong

Abstract

Photocatalytic overall water splitting (POWS) is a promising route for converting solar energy into green and sustainable energy. Herein, we report a facile hydrothermal approach for the fabrication of x‐shaped α‐FeOOH photocatalysts containing high‐index facets for POWS. The x‐shaped α‐FeOOH photocatalysts exhibited enhanced visible‐light‐driven POWS activities in comparison with that of FeOOH without x‐structures, with a maximum H2 and O2 evolution rate of 9.2 and 4.7 μmol h−1 g−1, respectively. The morphology and particle size of the α‐FeOOH could be controlled by adjusting the NH4F concentration in the precursors. The photodeposition of Pt and RuO2 on the x‐shaped α‐FeOOH revealed the specially separated reduction and oxidation centers on the surface of α‐FeOOH, with the oxidation‐active sites selectively located on the edges of the α‐FeOOH x‐structures. Electrochemical experiments further affirmed the enhanced charge separation in the x‐shaped α‐FeOOH. The smaller particle size and unique x‐shape of the α‐FeOOH photocatalyst were shown to enhance the POWS performance owing to the large specific surface area, high proportion of exposed high‐index facets, high electron‐transfer efficiency and effective separation of the photogenerated electron–hole pairs. The current study revealed that the x‐shaped α‐FeOOH products could serve as cost‐effective and stable photocatalysts for POWS.Full Tex

Topics: Chemical Sciences not elsewhere classified, Other Chemical Sciences
Publisher: Wiley Online
Year: 2018
DOI identifier: 10.1002/cssc.201800059
OAI identifier: oai:research-repository.griffith.edu.au:10072/385115
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