Reaction analysis of a direct methanol fuel cell employing a porous carbon plate operated at high methanol concentrations

Nobuyoshi Nakagawa, Kazuya Sekimoto, Mohd Shahbudin Mastar @ Masdar, Reiji Noda

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

It is known that a small amount of intermediate products, i.e., formaldehyde, formic acid and so on, is exhausted from a direct methanol fuel cell (DMFC). The production rates of such intermediates are affected by the methanol and water concentrations at the anode, and also the distribution of these products is variable. We investigated the production of the intermediates from a passive DMFC containing a porous carbon plate (PCP), which allows the use of methanol at high concentrations up to 100% due to the high resistivity to the methanol transport through the PCP. The production rates of each intermediate and their distribution were measured not only for a DMFC employing various PCPs with different transportation resistivities, but also for a DMFC without PCP. The results were analyzed in terms of the rate of methanol crossover (MCO) and water flux through the membrane. The detected intermediates were formaldehyde, formic acid, and methylformate, in accordance with previous reports. The production rates of the intermediates were strongly dependent on the flux of the MCO rather than the apparent methanol concentration. When the DMFC was operated under the rate limiting conditions of the methanol transport by the PCP, the production rates of the intermediates were low. However, when it was operated outside of the rate limiting conditions, the production rate increased with the increasing rate of methanol crossover.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalJournal of Power Sources
Volume186
Issue number1
DOIs
Publication statusPublished - 1 Jan 2009
Externally publishedYes

Fingerprint

Direct methanol fuel cells (DMFC)
fuel cells
Methanol
Carbon
methyl alcohol
formic acid
carbon
Formic acid
Formaldehyde
crossovers
Fluxes
formaldehyde
Water
Anodes
electrical resistivity
Membranes
products
water
anodes

Keywords

  • Methanol crossover (MCO)
  • Passive DMFC
  • Porous carbon plate
  • Reaction product

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

Reaction analysis of a direct methanol fuel cell employing a porous carbon plate operated at high methanol concentrations. / Nakagawa, Nobuyoshi; Sekimoto, Kazuya; Mastar @ Masdar, Mohd Shahbudin; Noda, Reiji.

In: Journal of Power Sources, Vol. 186, No. 1, 01.01.2009, p. 45-51.

Research output: Contribution to journalArticle

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