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1124553 
Journal Article 
Additive treatment effect of TiO2 as supports for Pt-based electrocatalysts on oxygen reduction reaction activity 
Kim, DS; Zeid, EFA; Kim, YT 
2010 
Yes 
Electrochimica Acta
ISSN: 0013-4686 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
55 
11 
3628-3633 
WOS:000276935900005 
In this study, we investigated the additive treatment effect of TiO2 as alternative support materials to common carbon black for Pt-based electrocatalysts on electrocatalytic activity for oxygen reduction reaction (ORR). The shape of TiO2 was varied by hydrothermal treatment with various additives, such as urea, thiourea, and hydrofluoric acid. From the results of transmission electron microscopy (TEM) images and ultraviolet-visible spectroscopy (UV-vis) spectra, it was identified that the morphology of hydrofluoric acid (HF)-treated TiO2 was changed into a round shape having lower aspect ratio than other samples, and its band gap was decreased. Notably, the electronic state of HF-treated TiO2 support was changed into highly reduced (electron rich) state which led to the increase of ORR activity, compared to other samples treated with different additives or before treatment. The electrocatalytic characteristics changes after treatment with various additives were investigated by using X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), cyclic voltammograms (CV), and rotating disk electrode (ROE) techniques. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved. 
Polymer electrolyte membrane fuel cell (PEMFC); Cathode electrocatalyst; Oxygen reduction reaction; Oxide support; TiO2 
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