Antimony-Doped Tin Oxide Nanorods as a Transparent Conducting Electrode for Enhancing Photoelectrochemical Oxidation of Water by Hematite

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Departments of Chemical Engineering and Chemistry, Center for Electrochemistry, Texas Materials Institute, Center for Nano and Molecular Science, University of Texas at Austin, 1 University Station C0400, Austin, Texas 78712, United States
Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
*E-mail: [email protected] (C.B.M.).
*E-mail: [email protected] (G.S.).
Cite this: ACS Appl. Mater. Interfaces 2014, 6, 8, 5494–5499
Publication Date (Web):March 26, 2014
Copyright © 2014 American Chemical Society
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We report the growth of well-defined antimony-doped tin oxide (ATO) nanorods as a conductive scaffold to improve hematite’s photoelectrochemical water oxidation performance. The hematite grown on ATO exhibits greatly improved performance for photoelectrochemical water oxidation compared to hematite grown on flat fluorine-doped tin oxide (FTO). The optimized photocurrent density of hematite on ATO is 0.67 mA/cm2 (0.6 V vs Ag/AgCl), which is much larger than the photocurrent density of hematite on flat FTO (0.03 mA/cm2). Using H2O2 as a hole scavenger, it is shown that the ATO nanorods indeed act as a useful scaffold and enhanced the bulk charge separation efficiency of hematite from 2.5% to 18% at 0.4 V vs Ag/AgCl.

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Included are the experimental methods, SEM images of ATO nanorods, XPS spectra of Sn and Sb (3d3/2) regions, amperometric it stability testing plots, UV–vis absorbance, raw hole scavenger it data, and CV measurements. This material is available free of charge via the Internet at

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