Qingjie Wang, Zeyuan Wang, Nan Liao, Salvador Montilla-Verdú, Maxime Contreras, Néstor Guijarro* and Jingshan Luo*,
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引用次数: 0
Abstract
Altering the surface stoichiometry of semiconductor electrodes is known to affect the photoelectrochemical (PEC) response. To date, several reports have hinted at the influence of the surface Bi:V ratio on the solar water oxidation performance of BiVO4 photoanodes, but only a handful of strategies have been reported to afford tuning of such surface stoichiometry, while a comprehensive understanding at an atomic level of the role of the surface termination remains elusive. Herein, we report a new methodology that modulates the surface Bi:V ratio and maximizes the PEC performance toward the oxygen evolution reaction (OER). The presence of ammonium metavanadate drastically reduces the surface recombination while improving the charge separation. Detailed characterization revealed that this treatment filled the native surface vanadium vacancies, which usually act as recombination centers, while inducing a significant increase in the density of oxygen vacancies, which reinforced the built-in electric field that drives the charge separation. Interestingly, coating with NiFeOx improves, especially, the charge separation in surface V-modified BiVO4. Results suggest that the V-modified surface termination altered the surface energetics of BiVO4, leading to an improved band alignment across the interface. Overall, these results provide a new platform to modulate the surface stoichiometry of BiVO4 thin films while shedding new light on the mechanisms by which the surface termination governs the PEC response.
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.