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New insight into the roles of oxygen vacancies in hematite for solar water splitting
Zhao X.; Feng J.; Chen S.; Huang Y.; Sum T.C.; Chen Z.
2017
Source PublicationPhysical Chemistry Chemical Physics
ISSN14639076
Volume19Issue:2Pages:1074-1082
AbstractOxygen vacancies play an important role in the performance improvement of oxide semiconductors as photoanodes for water splitting, such as TiO , WO , and Fe O . Conductivity improvement due to the presence of oxygen vacancies was reported to be the main reason for the enhanced performance. However, oxygen vacancies may also affect light absorption and charge transfer through the solid/electrolyte interface. The roles of oxygen vacancies have not been thoroughly discussed in the past. Herein, with hematite as an example, the effects of oxygen vacancies on bulk charge transport and surface catalysis are quantitatively analyzed by decoupling photon absorption, interfacial charge transfer and charge separation processes. Oxygen vacancies improve the charge separation of both pristine and Ti-doped hematite. However, opposite observations are found in the charge transfer process for pristine and Ti-doped hematite: the positive effect in pristine hematite but the negative effect in the Ti-doped one. An electrochemical technique is used to analyze the different influences on pristine and Ti-doped hematite to unravel the mechanism of the opposite observations caused by oxygen vacancies. The current study sheds lights on how oxygen vacancies affect various aspects of important factors behind PEC performance, which is helpful to the development of more efficient photoanodes in the future.
DOI10.1039/c6cp06410h
URLView the original
Language英語
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Cited Times [WOS]:37   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
AffiliationNanyang Technological University
Recommended Citation
GB/T 7714
Zhao X.,Feng J.,Chen S.,et al. New insight into the roles of oxygen vacancies in hematite for solar water splitting[J]. Physical Chemistry Chemical Physics,2017,19(2):1074-1082.
APA Zhao X.,Feng J.,Chen S.,Huang Y.,Sum T.C.,&Chen Z..(2017).New insight into the roles of oxygen vacancies in hematite for solar water splitting.Physical Chemistry Chemical Physics,19(2),1074-1082.
MLA Zhao X.,et al."New insight into the roles of oxygen vacancies in hematite for solar water splitting".Physical Chemistry Chemical Physics 19.2(2017):1074-1082.
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