Journal
JOURNAL OF POWER SOURCES
Volume 189, Issue 2, Pages 982-987Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.12.065
Keywords
Oxygen reduction reaction; Electrocatalysis; TiO2 nanotubes; Pd; Fuel cells
Funding
- NSFC of China [20676156, 20806096]
- Chinese Ministry of Education [30701]
- Chongqing and Guangdong Sci&Tech Key Projects [CSTC2007AB6012, 2007Z1-D0051]
- Chongqing University Postgraduates' Science and Innovation Fund [200701Y1A0260212]
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Highly ordered and uniformly distributed TiO2 nanotubes on a pure titanium substrate (TNTs/Ti) are successfully fabricated by a pulse anodic oxidation method as the support for Pd electrocatalyst. Pd is electrochemically deposited onto TNTs/Ti support. The sensitization with SnCl2 and activation with PdCl2 are critical for the formation of highly dispersed Pd nanoparticles on the TNTs/Ti support. It has been found that both Pd/TNTs/Ti and Pt electrodes show the similar electrochemical behavior in H2SO4, implying the possibility to develop the Pt-free alternative electrocatalyst based on the Pd/TNTs/Ti system in acid medium. The preliminary results in this work show that the Pd/TNTs/Ti catalysts have an acceptable catalytic activity for the oxygen reduction reaction (ORR) in acid medium. The factors influencing the structure of TNTs and the catalytic activity of Pd/TNTs/Ti for the ORR are also studied in detail. (C) 2008 Elsevier B.V. All rights reserved.
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