Boosting Oxygen Evolution Reaction Performance on BiVO4 Photoanode via Gradient Oxygen Vacancies

IF 19.3 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Nan Li, Yan Wei, Shujie Liu, Zhaoshi Yu, Yan Shen, Mingkui Wang
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Abstract

BiVO4 is extensively studied in photoelectrochemical water splitting systems. Its relatively large bandgap and low charge carrier mobility severely limit the solar-driven oxygen evolution reaction on BiVO4. A gradient distribution of oxygen vacancies can modulate the structural and electrical properties of BiVO4. However, the formation of oxygen vacancies remains a daunting challenge. Here, we propose a simple hydrothermal post-treatment method to deposit a thin amorphous BiOx layer (∼8 nm) with gradient oxygen vacancies on the surface of BiVO4 and enable directional hole migration. The resultant BiVO4/BiOx/NiFeOx photoanode achieves a high photocurrent density of 6.34 mA cm–2 at 1.23 V (vs RHE) in 1.0 M potassium borate solution. A solar-to-hydrogen conversion efficiency of 0.89% is obtained in a device using a BiVO4/BiOx/NiFeOx photoanode and a CuBi2O4 photocathode at zero bias. This work highlights a novel strategy for modulating the oxygen vacancy gradient and provides insights into the design of unbiased solar water splitting systems.

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来源期刊
ACS Energy Letters
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍: ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.
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