Improved photoelectrochemical water splitting performance of Sn-doped hematite photoanode with an amorphous cobalt oxide layer
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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8
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International Journal of Hydrogen Energy, Volume 51, issue Part C, pp. 1176-1183
Abstract
Hematite with a suitable band gap is a promising candidate as the photoanode for photoelectrochemical water splitting, but it suffers from low catalytic activity and severe electron-hole recombination. Herein, a novel two-step solvothermal synthetic strategy is developed to fabricate a uniform CoOx amorphous layer with a thickness of 5 nm on Sn-doped Fe2O3 nanowire photoanode. The CoOx surface layer increases the roughness of the photoanode significantly, and thus enlarges the electrochemical active area. Furthermore, the CoOx layer brings Co2+/Co3+ redox couples, enhances the concentration of oxygen vacancies and increases the charge carrier density. The bulk and surface charge separation efficiencies are both improved. The surface charge transfer process and the oxygen evolution reaction are accelerated. The photocurrent density of the Sn–Fe2O3 photoanode at 1.23 V (vs. reversible hydrogen electrode) is improved from 0.83 to 1.40 mA cm−2 after the deposition of the CoOx surface layer.Description
Funding Information: The financial support from National Natural Science Foundation of China under contract number 22075205 and the support of Tianjin Municipal Science and Technology Commission under contract number 19JCYBJC21700 are gratefully acknowledged. The work has been also supported by the Program of Introducing Talents to the University Disciplines under file number B06006 , and the Program for Changjiang Scholars and Innovative Research Teams in Universities under file number IRT 0641 . Publisher Copyright: © 2023
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Huang, Q, Zhao, Y & Li, Y 2024, 'Improved photoelectrochemical water splitting performance of Sn-doped hematite photoanode with an amorphous cobalt oxide layer', International Journal of Hydrogen Energy, vol. 51, no. Part C, pp. 1176-1183. https://doi.org/10.1016/j.ijhydene.2023.11.033