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dc.contributor.authorAhmed, Mahmoud Gamalen_US
dc.contributor.authorZhang, Mengyuanen_US
dc.contributor.authorTay, Ying Fanen_US
dc.contributor.authorChiam, Sing Yangen_US
dc.contributor.authorWong, Lydia Helenaen_US
dc.date.accessioned2020-12-09T05:24:52Z-
dc.date.available2020-12-09T05:24:52Z-
dc.date.issued2020-
dc.identifier.citationAhmed, M. G., Zhang, M., Tay, Y. F., Chiam, S. Y., & Wong, Lydia H. (2020). Surface modification of hematite photoanodes with CeOx cocatalyst for improved photoelectrochemical water oxidation kinetics. ChemSusChem, 13(20), 5489-5496. doi:10.1002/cssc.202001135en_US
dc.identifier.issn1864-564Xen_US
dc.identifier.urihttps://hdl.handle.net/10356/145038-
dc.description.abstractHematite is a promising photoanode for solar water splitting by photoelectrochemical (PEC) cells, but its performance is limited by the slow kinetics of water oxidation reaction or oxygen evolution reaction (OER). Surface modification of hematite photoanodes with a suitable water oxidation cocatalyst is a key strategy for improving the kinetics of water oxidation. In this study, a CeOx overlayer is deposited on the surface of the hematite photoanode by a water‐based solution method with ceric ammonium nitrate (CAN) followed by heat treatment. The photocurrent of CeOx‐modified hematite is 3 times higher than that of pristine hematite (at 1.23 V vs. RHE) under AM 1.5G, 1 sun conditions. Through hole‐scavenger measurements, Tafel plot analysis, and electrochemical impedance spectroscopy, it is concluded that CeOx overlayer increases the hole injection efficiency, improves the surface catalytic activity, and enhances charge transfer across the photoanode/electrolyte interface. These observations are attributed to the synergistic effects of Ce3+/Ce4+ redox species in CeOx and the oxygen vacancies. This work elucidates the role of CeOx as an efficient cocatalyst overlayer to improve the OER kinetics of photoanodes.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.language.isoenen_US
dc.relationMOE2016-T2-1-030en_US
dc.relation.ispartofChemSusChemen_US
dc.rightsThis is the accepted version of the following article: Ahmed, M. G., Zhang, M., Tay, Y. F., Chiam, S. Y., & Wong, Lydia H. (2020). Surface modification of hematite photoanodes with CeOx cocatalyst for improved photoelectrochemical water oxidation kinetics. ChemSusChem, 13(20), 5489-5496. doi:10.1002/cssc.202001135, which has been published in final form at https://doi.org/10.1002/cssc.202001135. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].en_US
dc.subjectScience::Chemistry::Physical chemistryen_US
dc.titleSurface modification of hematite photoanodes with CeOx cocatalyst for improved photoelectrochemical water oxidation kineticsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.researchSolar Fuels Laboratoryen_US
dc.identifier.doi10.1002/cssc.202001135-
dc.description.versionAccepted versionen_US
dc.identifier.issue20en_US
dc.identifier.volume13en_US
dc.identifier.spage5489en_US
dc.identifier.epage5496en_US
dc.subject.keywordsPhotoelectrochemical Water Splittingen_US
dc.subject.keywordsHematite Photoanodeen_US
dc.description.acknowledgementThis research is partially supported by grants from the National Research Foundation, Prime Min ister’s Office, Sin g ap o re un der its Campus of Research Excellence and Technological Enterprise (CREATE) programme and Ministry of Education (MOE) Tier 2 Project (MOE2016-T2-1-030).en_US
item.grantfulltextembargo_20211028-
item.fulltextWith Fulltext-
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Surface Modification of Hematite Photoanodes with CeOx Cocatalyst for Improved Photoelectrochemical Water Oxidation Kinetics.pdf
  Until 2021-10-28
Manuscript1.62 MBAdobe PDFUnder embargo until Oct 28, 2021
2020 ChemSusChem.CeOx - Supp info. pdf.pdf
  Until 2021-10-28
Supporting information785.24 kBAdobe PDFUnder embargo until Oct 28, 2021

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