Improved photoelectrochemical water splitting performance of Sn-doped hematite photoanode with an amorphous cobalt oxide layer

Qiuyang Huang, Yicheng Zhao*, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
Pages (from-to)1176-1183
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume51
Issue numberPart C
Early online date14 Dec 2023
DOIs
Publication statusPublished - 2 Jan 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Cobalt oxide
  • Hematite
  • Oxygen evolution reaction
  • Photoanode
  • Photoelectrochemical water splitting

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