journal article·2020-05-26Open access

Bifunctional Photoelectrode Driven by Charged Domain Walls in Ferroelectric Bi2WO6

Rizwan Ullah, Minghui Pei, Junsheng Wu, Yu Tian, Zhenao Gu, Qinghua Zhang, Chuangye Song, Yuben Yang, Munir Ahmad, Johar Zeb, Fazal Qayyum, Yanyu Liu, Xiaoqiang An, Lin Gu, Xueyun Wang, Jinxing Zhang

ACS Applied Energy Materials· Volume 3· Issue 5

Abstract

Photoelectrochemical technology provides a promising way to solve the emerging energy crisis, yet it still faces obstacles like weak charge transfer and separation of traditional photoelectrodes. Here, by using single crystalline epitaxial ferroelectric Bi2WO6 thin films, a bifunctional photoelectrode for photoelectrochemical water splitting is demonstrated, which originates from the in-plane ferroelectricity and charged domain walls. The optimized anodic (cathodic) photocurrent density is 0.175 (0.240) mA cm–2 at 1.23 V (0 V) vs RHE in Na2SO4 (pH = 7) electrolyte solution. Manipulations of the in-plane polarization and charged domain walls provide an alternative catalyzing strategy toward efficient and controllable photoelectrochemical water splitting.
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Research context

OpenAlex topics: Advanced Photocatalysis Techniques · Multiferroics and related materials · Perovskite Materials and Applications

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

Affiliations

Department of Physics, Beijing Normal University, 100875 Beijing, China

School of Basic Medical Science, Air Force Medical University, 710032 Shanxi Xi’an, China

Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085 Beijing, China

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China

Songshan Lake Materials Laboratory, 523808 Guangdong Dongguan, China

Department of Physics, Hazara University, Mansehra, 21300 Khyber Pakhtunkhwa, Pakistan

School of Aerospace Engineering, Beijing Institute of Technology, 100081 Beijing, China

Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, 100084 Beijing, China

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Beijing Municipality · Beijing Institute of Technology · National Natural Science Foundation of China · Chinese Academy of Sciences

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