期刊
ELECTROCHIMICA ACTA
卷 297, 期 -, 页码 784-793出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.11.166
关键词
alpha-Fe2O3; Ti doping; Water splitting; Electrospray deposition; PEC
资金
- Korea Institute of Science and Technology (KIST) under the KIST-School Partnership project [RFP-2016-17]
- Institution of Chemical Sciences, University of Peshawar
- Higher Education of Pakistan
Elemental doping is considered to be an effective strategy to improve the photoelectrochemical (PEC) activity of hematite (alpha-Fe2O3) as a photoanode for water splitting, but the precise function (s) of the dopant remains unclear. In this study, we report on the structural and charge separation properties of titanium-doped hematite (Ti doped Fe2O3) films prepared by a simple electrospray technique for PEC water oxidation. The effect of Ti doping on the structure, morphology, light absorption, and electrical and photoelectrochemical properties was investigated on alpha-Fe2O3 films. SEM images revealed a reduction in particle sizes for 2% Ti doped alpha-Fe2O3, while an increase in particle size was observed for higher Ti content. XRD confirmed the presence of alpha-Fe2O3 without any impurity or other phases. From XPS spectra, the incorporation of Ti was confirmed in the form of Ti4+ as predominant species while no impurities from the substrate were detected. When the Ti doped Fe2O3 (2% Ti) film was used as a photoanode in a PEC cell, it delivered the best performance with a maximum photocurrent density of 1.09 mA cm(-2) (at 1.8 V vs. RHE and under standard 1 sun illumination conditions (AM 1.5 G, 100 mW cm(-2))), which is 2 times higher than that of the un-doped alpha-Fe2O3 (0.51 mA cm(-2)). The photoelectrode also showed a superior incident photon to current efficiency (IPCE) as compared to an un-doped alpha-Fe2O3. This enhancement in performance was attributed to the better charge separation and transport properties of alpha-Fe2O3 due to Ti doping, as revealed by an electrochemical impedance spectroscopy (EIS) analysis. (C) 2018 Elsevier Ltd. All rights reserved.
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