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

12 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

Fingerprint

Sulfanilic Acids
Direct methanol fuel cells (DMFC)
Electropolymerization
electrocatalysts
Ionic conductivity
ion currents
fuel cells
Fuel cells
methyl alcohol
porosity
acids
Catalysts
Acids
Electrochemical impedance spectroscopy
Electrolytes
Methanol
Polymers
Oxidation
Microstructure
Electrodes

Keywords

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

ASJC Scopus subject areas

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

Cite this

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title = "Ionic conductivity improvement in primary pores of fuel cell catalyst layers: Electropolymerization of m-aminobenzenesulfonic acid and its effect on the performance",
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.",
keywords = "Catalyst layers, Electrochemical impedance spectroscopy, Electropolymerization, Fuel cells, Ionic conductivity",
author = "Satoshi Tominaka and Kazuya Goto and Toshiyuki Momma and Tetsuya Osaka",
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T1 - Ionic conductivity improvement in primary pores of fuel cell catalyst layers

T2 - Electropolymerization of m-aminobenzenesulfonic acid and its effect on the performance

AU - Tominaka, Satoshi

AU - Goto, Kazuya

AU - Momma, Toshiyuki

AU - Osaka, Tetsuya

PY - 2009/7/15

Y1 - 2009/7/15

N2 - 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.

AB - 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.

KW - Catalyst layers

KW - Electrochemical impedance spectroscopy

KW - Electropolymerization

KW - Fuel cells

KW - Ionic conductivity

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