DataVXAdvanced Energy MaterialsPaper
journal article·2018-11Open access

Origin of Improved Photoelectrochemical Water Splitting in Mixed Perovskite Oxides

Weiwei Li, Kai Jiang, Zhongguo Li, Shijing Gong, Robert L. Z. Hoye, Zhigao Hu, Yinglin Song, Chuanmu Tian, Jongkyoung Kim, Kelvin H. L. Zhang, Seungho Cho, Judith L. MacManus‐Driscoll

Advanced Energy Materials· Volume 8· Issue 31
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Source abstract

Abstract

Abstract Owing to the versatility in their chemical and physical properties, transition metal perovskite oxides have emerged as a new category of highly efficient photocatalysts for photoelectrochemical (PEC) water splitting. Here, to understand the underlying mechanism for the enhanced PEC water splitting in mixed perovskites, ideal epitaxial thin films of the BiFeO3–SrTiO3 system are explored. The electronic structure and carrier dynamics are determined from both experiment and density‐functional theory calculations. The intrinsic phenomena are measured in this ideal system, contrasting to commonly studied polycrystalline solid solutions where extrinsic structural features obscure the intrinsic phenomena. It is determined that when SrTiO3 is added to BiFeO3 the conduction band minimum position is raised and an exponential tail of trap states from hybridized Ti 3d and Fe 3d orbitals emerges near the conduction band edge. The presence of these trap states strongly suppresses the fast electron–hole recombination and improves the photocurrent density in the visible‐light region, up to 16× at 0 VRHE compared to the pure end member compositions. This work provides a new design approach for optimizing the PEC performance in mixed perovksite oxides.
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Research context

Electronic materialsCatalysis & surfaces

OpenAlex topics: Multiferroics and related materials · Advanced Photocatalysis Techniques · Iron oxide chemistry and applications

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

Affiliations

Department of Materials Science & Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS United Kingdom

Key Laboratory of Polar Materials and Devices (MOE) and Technical Center for Multifunctional Magneto‐Optical Spectroscopy (Shanghai) Department of Electronic Engineering East China Normal University Shanghai 200241 China

College of Physics and Electronic Engineering and Jiangsu Laboratory of Advanced Functional Materials Changshu Institute of Technology Changshu 215500 China

Cavendish Laboratory JJ Thomson Ave University of Cambridge Cambridge CB3 0HE United Kingdom

Department of Physics Harbin Institute of Technology Harbin 150001 China

College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

School of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

Funding

Engineering and Physical Sciences Research Council · Isaac Newton Trust · National Natural Science Foundation of China · Ulsan National Institute of Science and Technology · National Research Foundation of Korea · Ministry of Science, ICT and Future Planning

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