Chae, Sang Youn Rahman, Gul Joo, Oh-shim 2024-01-19T20:34:15Z 2024-01-19T20:34:15Z 2021-09-02 2019-02-20 0013-4686 https://pubs.kist.re.kr/handle/201004/120337 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. English PERGAMON-ELSEVIER SCIENCE LTD ALPHA-FE2O3 THIN-FILMS NANOSTRUCTURED HEMATITE HYDROGEN-PRODUCTION TI PHOTOANODES PERFORMANCE RECOMBINATION ENHANCEMENT Elucidation of the structural and charge separation properties of titanium-doped hematite films deposited by electrospray method for photoelectrochemical water oxidation Article 10.1016/j.electacta.2018.11.166 1 ELECTROCHIMICA ACTA, v.297, pp.784 - 793 ELECTROCHIMICA ACTA 297 784 793 scie scopus 000455642500087 2-s2.0-85059298803 Electrochemistry Electrochemistry Article ALPHA-FE2O3 THIN-FILMS NANOSTRUCTURED HEMATITE HYDROGEN-PRODUCTION TI PHOTOANODES PERFORMANCE RECOMBINATION ENHANCEMENT alpha-Fe2O3 Ti doping Water splitting Electrospray deposition PEC