Iron-doping-enhanced photoelectrochemical water splitting performance of nanostructured WO3 : A combined experimental and theoretical study

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Teng Zhang
  • Haining Chen
  • Yang Bai
  • Shuang Xiao
  • Xiaoli Zheng
  • Qingzhong Xue
  • Shihe Yang

Detail(s)

Original languageEnglish
Pages (from-to)2933-2940
Journal / PublicationNanoscale
Volume7
Issue number7
Online published23 Dec 2014
Publication statusPublished - 21 Feb 2015
Externally publishedYes

Abstract

In this paper, we have studied Fe-doping of nanostructured tungsten trioxide (WO3) and its pronounced effect in promoting the photoelectrochemical (PEC) water splitting performance. Vertically aligned Fe-doped WO3 nanoflakes on fluorine-doped tin oxide (FTO) were synthesized via the hydrothermal method. An X-ray photoelectron spectroscopy (XPS) analysis confirmed the Fe3+ substitution at the W6+ site in the prepared films. Broadened visible light absorption was observed in doped films, likely due to the formation of extra band states through doping. The Fe-doping was shown to greatly improve the PEC water splitting performance of WO3. More specifically, the 2 mol% Fe-doped WO3 achieved a photocurrent density of 0.88 mA cm-2 at 1.23 V versus RHE, approximately 30% higher than that of the undoped WO3 (0.69 mA cm-2 at 1.23 V versus RHE). This enhancement was attributed to the reduced band gap and the doping-enhanced charge carrier density as confirmed by the absorption spectra and the Mott-Schottky plots, respectively. Finally, first-principles density functional theory (DFT) calculations confirmed that the formation of oxygen vacancies was favored after Fe-doping, contributing to the increased charge carrier density in slightly doped films.

Citation Format(s)

Iron-doping-enhanced photoelectrochemical water splitting performance of nanostructured WO3 : A combined experimental and theoretical study. / Zhang, Teng; Zhu, Zonglong; Chen, Haining; Bai, Yang; Xiao, Shuang; Zheng, Xiaoli; Xue, Qingzhong; Yang, Shihe.

In: Nanoscale, Vol. 7, No. 7, 21.02.2015, p. 2933-2940.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review