Mass spectroscopy for the anode gas layer in a semi-passive DMFC using porous carbon plate Part I: Relationship between the gas composition and the current density

Mohd Shahbudin Mastar @ Masdar, Takuya Tsujiguchi, Nobuyoshi Nakagawa

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In situ mass spectroscopy with a capillary probe was conducted for the anode gas layer of a semi-passive direct methanol fuel cell (DMFC) employing a porous carbon plate (PCP) in order to evaluate the gas composition in contact with the anode. Different types of PCPs were used for the DMFC, and then the relationship between the gas composition in the gas layer and the current density was investigated. The profiles of the CO2 gas pressure, methanol and water vapor pressures were discussed on the basis of the current density and the resistance for the methanol and CO2 transport through the PCP. The current density linearly and identically increased with the increase in the partial pressure of methanol, PC H3 OH, in the gas layer up to 7.5 kPa irrespective of the type of the PCP suggesting that the current was a function of PC H3 OH and it was rate limited by the methanol transport to the anode. The calculated liquid methanol concentration equivalent to the measured gas mixture in the gas layer was about 5-7 M in the optimum conditions. This confirmed that the actual methanol activity on the anode of the DMFC with the PCP was controlled by the PCP and was similar to that of the usual liquid feed DMFC even when a very high concentration of methanol was in the reservoir.

Original languageEnglish
Pages (from-to)610-617
Number of pages8
JournalJournal of Power Sources
Volume194
Issue number2
DOIs
Publication statusPublished - 1 Dec 2009
Externally publishedYes

Fingerprint

Direct methanol fuel cells (DMFC)
gas composition
fuel cells
Methanol
Anodes
anodes
Current density
mass spectroscopy
Carbon
methyl alcohol
Gases
Spectroscopy
current density
carbon
Chemical analysis
gases
Steam
Liquids
Vapor pressure
Gas mixtures

Keywords

  • Anode gas layer
  • Mass spectrometry
  • Partial pressure of methanol
  • Passive DMFC
  • Porous carbon plate

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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abstract = "In situ mass spectroscopy with a capillary probe was conducted for the anode gas layer of a semi-passive direct methanol fuel cell (DMFC) employing a porous carbon plate (PCP) in order to evaluate the gas composition in contact with the anode. Different types of PCPs were used for the DMFC, and then the relationship between the gas composition in the gas layer and the current density was investigated. The profiles of the CO2 gas pressure, methanol and water vapor pressures were discussed on the basis of the current density and the resistance for the methanol and CO2 transport through the PCP. The current density linearly and identically increased with the increase in the partial pressure of methanol, PC H3 OH, in the gas layer up to 7.5 kPa irrespective of the type of the PCP suggesting that the current was a function of PC H3 OH and it was rate limited by the methanol transport to the anode. The calculated liquid methanol concentration equivalent to the measured gas mixture in the gas layer was about 5-7 M in the optimum conditions. This confirmed that the actual methanol activity on the anode of the DMFC with the PCP was controlled by the PCP and was similar to that of the usual liquid feed DMFC even when a very high concentration of methanol was in the reservoir.",
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author = "{Mastar @ Masdar}, {Mohd Shahbudin} and Takuya Tsujiguchi and Nobuyoshi Nakagawa",
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AU - Mastar @ Masdar, Mohd Shahbudin

AU - Tsujiguchi, Takuya

AU - Nakagawa, Nobuyoshi

PY - 2009/12/1

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N2 - In situ mass spectroscopy with a capillary probe was conducted for the anode gas layer of a semi-passive direct methanol fuel cell (DMFC) employing a porous carbon plate (PCP) in order to evaluate the gas composition in contact with the anode. Different types of PCPs were used for the DMFC, and then the relationship between the gas composition in the gas layer and the current density was investigated. The profiles of the CO2 gas pressure, methanol and water vapor pressures were discussed on the basis of the current density and the resistance for the methanol and CO2 transport through the PCP. The current density linearly and identically increased with the increase in the partial pressure of methanol, PC H3 OH, in the gas layer up to 7.5 kPa irrespective of the type of the PCP suggesting that the current was a function of PC H3 OH and it was rate limited by the methanol transport to the anode. The calculated liquid methanol concentration equivalent to the measured gas mixture in the gas layer was about 5-7 M in the optimum conditions. This confirmed that the actual methanol activity on the anode of the DMFC with the PCP was controlled by the PCP and was similar to that of the usual liquid feed DMFC even when a very high concentration of methanol was in the reservoir.

AB - In situ mass spectroscopy with a capillary probe was conducted for the anode gas layer of a semi-passive direct methanol fuel cell (DMFC) employing a porous carbon plate (PCP) in order to evaluate the gas composition in contact with the anode. Different types of PCPs were used for the DMFC, and then the relationship between the gas composition in the gas layer and the current density was investigated. The profiles of the CO2 gas pressure, methanol and water vapor pressures were discussed on the basis of the current density and the resistance for the methanol and CO2 transport through the PCP. The current density linearly and identically increased with the increase in the partial pressure of methanol, PC H3 OH, in the gas layer up to 7.5 kPa irrespective of the type of the PCP suggesting that the current was a function of PC H3 OH and it was rate limited by the methanol transport to the anode. The calculated liquid methanol concentration equivalent to the measured gas mixture in the gas layer was about 5-7 M in the optimum conditions. This confirmed that the actual methanol activity on the anode of the DMFC with the PCP was controlled by the PCP and was similar to that of the usual liquid feed DMFC even when a very high concentration of methanol was in the reservoir.

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KW - Porous carbon plate

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