The influence of the Nafion ionomer as a proton conductor on the platinum-ruthenium (Pt-Ru) alloy electrocatalyst for the electro-oxidation of methanol was investigated using combinatorial electrochemical methods. The most active composition of the Pt-Ru alloy electrocatalysts for the electro-oxidation of methanol was Pt(54.5)Ru(45.5), and the most active composition of the Pt-Ru-Nafion electrocatalysts for the electro-oxidation of methanol was metal (Pt:Ru = 1:1, molar ratio):Nafion = 63.6:36.4, wt.%. The electrochemical properties of the electrodes were compared using cyclic voltammetry, impedance spectroscopy and a performance test of a direct methanol fuel cell (DMFC). When the Nafion was added to the Pt-Ru alloy electrocatalyst, the initial activation potential decreased about 80mV versus RHE, and the methanol electro-oxidation activity simultaneously increased. In a CO poisoning experiment, the CO was desorbed at a lower potential (lower than 130mV versus RHE) when the Nafion was present. These results suggest a synergistic effect of Nafion-active metal catalysts for the electro-oxidation of methanol.
|Number of pages||8|
|Journal||Journal of Power Sources|
|Publication status||Published - 2003 May 25|
|Event||Scientific Advances in Fuel Cell Systems - Amsterdam, Netherlands|
Duration: 2002 Sept 25 → 2002 Sept 26
Bibliographical noteFunding Information:
This research was funded by Center for Ultramicrochemical Process Systems (CUPS) sponsored by Korea Science and Engineering Foundation (KOSEF), Brain Korea 21 (BK21), and Korea Research Foundation Grant (KRF 2001-005-E00030).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering