Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/145038
Title: Surface modification of hematite photoanodes with CeOx cocatalyst for improved photoelectrochemical water oxidation kinetics
Authors: Ahmed, Mahmoud Gamal
Zhang, Mengyuan
Tay, Ying Fan
Chiam, Sing Yang
Wong, Lydia Helena
Keywords: Science::Chemistry::Physical chemistry
Issue Date: 2020
Source: 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
Project: MOE2016-T2-1-030
Journal: ChemSusChem
Abstract: Hematite 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.
URI: https://hdl.handle.net/10356/145038
ISSN: 1864-564X
DOI: 10.1002/cssc.202001135
Rights: This 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].
Fulltext Permission: embargo_20211028
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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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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