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AuthorMohamed, Aya M.
AuthorAmer, Ahmad W.
AuthorAlqaradawi, Siham Y.
AuthorAllam, Nageh K.
Available date2021-09-05T05:40:16Z
Publication Date2016
Publication NamePhysical Chemistry Chemical Physics
ResourceScopus
ISSN14639076
URIhttp://dx.doi.org/10.1039/c6cp02394k
URIhttp://hdl.handle.net/10576/22709
AbstractAn electrochemical method is presented to study the nature of the defect states in sub-stoichiometric tungsten oxide nanoflake photoanodes used in water splitting. First, stoichiometric/sub-stoichiometric tungstate nanoflake arrays were deliberately developed via annealing under different atmospheres (air, O2, and H2) in different sequences. UV-Vis diffuse reflectance spectra and Tauc analysis indicated the presence of oxygen vacancies, which was also confirmed via XRD and Raman analysis, with samples annealed in an air/O2 sequence resulting in the most stoichiometric monoclinic structures. A defect sensitivity factor was proposed to explain the nature of defects whether they are deep or shallow. Mott-Schottky analysis was used to confirm the expected defect donor densities, as well as to confirm the nature of the developed oxygen vacancy defect states. The tungstate photoanodes were tested in photoelectrochemical water splitting cells and their photoconversion efficiency was demonstrated and discussed in detail. 2016 the Owner Societies.
Languageen
PublisherRoyal Society of Chemistry
SubjectTungsten Oxides
Electrochromic Devices
Lithium Perchlorates
TitleOn the nature of defect states in tungstate nanoflake arrays as promising photoanodes in solar fuel cells
TypeArticle
Pagination22217-22223
Issue Number32
Volume Number18
dc.accessType Abstract Only


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