Dependence of the cell resistance on external potential in DMFC system

Noriko Oikawa, Lorene L. Abella, Satoshi Fukada, Tatsuya Matsumoto, Kenji Fukuda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The polarization properties of a portable direct methanol fuel cell (DMFC) subjected to an external potential are experimentally investigated. In DMFC, polymer electrolyte membrane plays important role as a proton conductor. The resistance of the membrane, which reflects ion-transport and mobility of ions through the membrane, is one of the fundamental factors that determine electric activity of the fuel cell. We applied an external potential in the reverse and forward direction to the cell potential of the DMFC system. From the dependencies of the effective membrane resistance on the external potential, it was found that there are several thresholds in the external potential at which the main reactions of the cell are switched. In the case of the reverse external potential, electrolysis of water and methanol induced by the accumulated electrons and protons reduce the cell resistance. For the forward external potential, on the other hand, the resistance becomes high due to the polarization inside the membrane. The resistance decreases as electric decomposition of water and methanol proceeds.

Original languageEnglish
Pages (from-to)67-76
Number of pages10
JournalMemoirs of the Faculty of Engineering, Kyushu University
Volume71
Issue number3
Publication statusPublished - Sep 5 2011
Externally publishedYes

Fingerprint

Direct methanol fuel cells (DMFC)
fuel cell
methanol
membrane
Membranes
Protons
Methanol
polarization
Polarization
ion
Ions
Electrolysis
electrolyte
Fuel cells
Water
electrokinesis
polymer
Electrolytes
Fuel cell
decomposition

All Science Journal Classification (ASJC) codes

  • Energy(all)
  • Atmospheric Science
  • Earth and Planetary Sciences(all)
  • Management of Technology and Innovation

Cite this

Dependence of the cell resistance on external potential in DMFC system. / Oikawa, Noriko; Abella, Lorene L.; Fukada, Satoshi; Matsumoto, Tatsuya; Fukuda, Kenji.

In: Memoirs of the Faculty of Engineering, Kyushu University, Vol. 71, No. 3, 05.09.2011, p. 67-76.

Research output: Contribution to journalArticle

Oikawa, Noriko ; Abella, Lorene L. ; Fukada, Satoshi ; Matsumoto, Tatsuya ; Fukuda, Kenji. / Dependence of the cell resistance on external potential in DMFC system. In: Memoirs of the Faculty of Engineering, Kyushu University. 2011 ; Vol. 71, No. 3. pp. 67-76.
@article{f0035d37c6574408a39c75859647d531,
title = "Dependence of the cell resistance on external potential in DMFC system",
abstract = "The polarization properties of a portable direct methanol fuel cell (DMFC) subjected to an external potential are experimentally investigated. In DMFC, polymer electrolyte membrane plays important role as a proton conductor. The resistance of the membrane, which reflects ion-transport and mobility of ions through the membrane, is one of the fundamental factors that determine electric activity of the fuel cell. We applied an external potential in the reverse and forward direction to the cell potential of the DMFC system. From the dependencies of the effective membrane resistance on the external potential, it was found that there are several thresholds in the external potential at which the main reactions of the cell are switched. In the case of the reverse external potential, electrolysis of water and methanol induced by the accumulated electrons and protons reduce the cell resistance. For the forward external potential, on the other hand, the resistance becomes high due to the polarization inside the membrane. The resistance decreases as electric decomposition of water and methanol proceeds.",
author = "Noriko Oikawa and Abella, {Lorene L.} and Satoshi Fukada and Tatsuya Matsumoto and Kenji Fukuda",
year = "2011",
month = "9",
day = "5",
language = "English",
volume = "71",
pages = "67--76",
journal = "Memoirs of the Faculty of Engineering, Kyushu University",
issn = "1345-868X",
publisher = "Kyushu University, Faculty of Science",
number = "3",

}

TY - JOUR

T1 - Dependence of the cell resistance on external potential in DMFC system

AU - Oikawa, Noriko

AU - Abella, Lorene L.

AU - Fukada, Satoshi

AU - Matsumoto, Tatsuya

AU - Fukuda, Kenji

PY - 2011/9/5

Y1 - 2011/9/5

N2 - The polarization properties of a portable direct methanol fuel cell (DMFC) subjected to an external potential are experimentally investigated. In DMFC, polymer electrolyte membrane plays important role as a proton conductor. The resistance of the membrane, which reflects ion-transport and mobility of ions through the membrane, is one of the fundamental factors that determine electric activity of the fuel cell. We applied an external potential in the reverse and forward direction to the cell potential of the DMFC system. From the dependencies of the effective membrane resistance on the external potential, it was found that there are several thresholds in the external potential at which the main reactions of the cell are switched. In the case of the reverse external potential, electrolysis of water and methanol induced by the accumulated electrons and protons reduce the cell resistance. For the forward external potential, on the other hand, the resistance becomes high due to the polarization inside the membrane. The resistance decreases as electric decomposition of water and methanol proceeds.

AB - The polarization properties of a portable direct methanol fuel cell (DMFC) subjected to an external potential are experimentally investigated. In DMFC, polymer electrolyte membrane plays important role as a proton conductor. The resistance of the membrane, which reflects ion-transport and mobility of ions through the membrane, is one of the fundamental factors that determine electric activity of the fuel cell. We applied an external potential in the reverse and forward direction to the cell potential of the DMFC system. From the dependencies of the effective membrane resistance on the external potential, it was found that there are several thresholds in the external potential at which the main reactions of the cell are switched. In the case of the reverse external potential, electrolysis of water and methanol induced by the accumulated electrons and protons reduce the cell resistance. For the forward external potential, on the other hand, the resistance becomes high due to the polarization inside the membrane. The resistance decreases as electric decomposition of water and methanol proceeds.

UR - http://www.scopus.com/inward/record.url?scp=80052582611&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80052582611&partnerID=8YFLogxK

M3 - Article

VL - 71

SP - 67

EP - 76

JO - Memoirs of the Faculty of Engineering, Kyushu University

JF - Memoirs of the Faculty of Engineering, Kyushu University

SN - 1345-868X

IS - 3

ER -