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Improved stability of TiO2 modified Ru85Se15/C electrocatalyst for proton exchange membrane fuel cells

✍ Scribed by Ting Xu; Huamin Zhang; Hexiang Zhong; Yuanwei Ma; Hong Jin; Yining Zhang

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
617 KB
Volume
195
Category
Article
ISSN
0378-7753

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✦ Synopsis

The electrocatalytic stability of the carbon supported Ru 85 Se 15 nanoparticles has been improved by the modification of titanium dioxide for proton exchange membrane fuel cells (PEMFCs). Transmission electron microscopy (TEM), X-ray diffraction (XRD) measurements and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) are applied for characterizing Ru 85 Se 15 /C and titanium dioxide modified Ru 85 Se 15 /C (Ru 85 Se 15 /TiO 2 /C) electrocatalysts. Electrochemical measurements and single cell tests are conducted for the evaluation of the electrocatalysts. The results indicate that Ru 85 Se 15 /TiO 2 /C electrocatalyst, presenting similar initial oxygen reduction reaction (ORR) activity with Ru 85 Se 15 /C, reveals better electrochemical stability. The final potential of Ru 85 Se 15 /TiO 2 /C is 137 mV higher than that of Ru 85 Se 15 /C at 2 mA cm -2 after the electrochemical durability test. Moreover, in the single cell stability test Ru 85 Se 15 /TiO 2 /C also shows comparable initial performance with Ru 85 Se 15 /C, but better final performance. Therefore, the Ru 85 Se 15 /C is expected to be used as an effective cathode electrocatalyst for PEMFCs by TiO 2 modification on the carbon support.

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