Evaluation of the Nafion effect on the activity of Pt-Ru electrocatalysts for the electro-oxidation of methanol

Young Hwan Chu, Yong Gun Shul, Won Choon Choi, Seong Ihl Woo, Hak Soo Han

Research output: Contribution to journalConference article

56 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)334-341
Number of pages8
JournalJournal of Power Sources
Volume118
Issue number1-2
DOIs
Publication statusPublished - 2003 May 25
EventScientific Advances in Fuel Cell Systems - Amsterdam, Netherlands
Duration: 2002 Sep 252002 Sep 26

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

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