Ionic conductivity improvement in primary pores of fuel cell catalyst layers: Electropolymerization of m-aminobenzenesulfonic acid and its effect on the performance

Satoshi Tominaka, Kazuya Goto, Toshiyuki Momma, Tetsuya Osaka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Catalyst layers of direct methanol fuel cells (DMFCs) are modified by in situ electropolymerization of m-aminobenzenesulfonic acid. By using electrochemical impedance spectroscopy and porosimetry, this modification is found to add polymer electrolyte into primary pores (<10 nm), where ionic resistance is high for lack of polymer electrolyte (i.e., Nafion), and the additional electrolyte successfully decreases the ionic resistance by 10-15% compared to the plain carbon surface with a slight ion-conductivity (>40 kΩ cm). In view of methanol oxidation characteristics, this modification decreases the resistance by ca. 25% (from 5.1 Ω cm2 to 3.7 Ω cm2) at 0.6 V vs. DHE, resulting in the increase in the cell voltage of DMFC test by ca. 20 mV. The clear relation between the performance and the microstructures is concluded to be helpful to understand the performance of fuel cell electrodes in detail.

Original languageEnglish
Pages (from-to)316-323
Number of pages8
JournalJournal of Power Sources
Volume192
Issue number2
DOIs
Publication statusPublished - 2009 Jul 15

Keywords

  • Catalyst layers
  • Electrochemical impedance spectroscopy
  • Electropolymerization
  • Fuel cells
  • Ionic conductivity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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