Enhancing photoelectrochemical activity of nanocrystalline WO3 electrodes by surface tuning with Fe(III)

Overview

Title: 

Enhancing photoelectrochemical activity of nanocrystalline WO3 electrodes by surface tuning with Fe(III)

Abstract: 

Tungsten oxide (WO3) photoelectrodes with the surface tuned by Fe(III) for photoelectrochemical water splitting were successfully synthesized. Nanostructured WO3 films were prepared using doctor blade method, then a facile and economical deposition-annealing process was employed to fabricate Fe(III) modified WO3 films. The resulting composite's structural and optical properties were analyzed by SEM, EDX, XRD, UV-Vis spectrometry and XPS. The photoelectrochemical properties were evaluated by photocurrent density under 500 W Xe lamp with an intensity of 100 mW/cm(2). The Fe(III) modified WO3 electrode exhibited a larger photocurrent than the pure WO3 electrode. Significantly, the optimized Fe(III) modified WO3 film achieved the maximum photocurrent density of 1.18 mA/cm(2) at 0.8 V vs. Ag/AgCl in the 0.2 M Na2SO4.The enhanced photocurrent was attributed to the extension of the light response and the electron hole separation at the interface Fe(III)/WO3 which was confirmed by Mott-Schottky and electrochemical impedance spectroscopy. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Authors: 

Song Han, Jie Li, Xiang Chen, Ye Huang, Canjun Liu, Yahui Yang, Wenzhang Li

DOI: 

Journal: 

International Journal Of Hydrogen Energy

Year: 

2012

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