On mass transport in an air-breathing DMFC stack

G. Q. Lu, P. C. Lim, F. Q. Liu, Chao Yang Wang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

An 8-cell air-breathing direct methanol fuel cell (DMFC) stack with the active area of 5 cm2 of each cell has been developed. Stainless steel plates of 500 μm thickness with flow channels were fabricated using photochemical etching method as the current collectors. Different conditioning methods for membrane electrode assembly (MEA) activation were discussed. With proper control of water crossover to the cathode, cathode flooding was avoided in the DMFC stack. Methanol crossover at open circuit voltage (OCV) in the air-breathing DMFC was measured. Further, it was found that flow maldistribution might occur in the parallel flow field of the stack, making carbon dioxide gas management at the anode necessary. Using humidified hydrogen in the anode with a high flow rate, the oxygen transport limiting current density was characterized and found to be sufficient in the air-breathing cathode. The stack produced a maximum output power of 1.33 W at 2.21 V at room temperature, corresponding to a power density of 33.3 mW cm-2.

Original languageEnglish (US)
Pages (from-to)1041-1050
Number of pages10
JournalInternational Journal of Energy Research
Volume29
Issue number12
DOIs
StatePublished - Oct 10 2005

Fingerprint

Direct methanol fuel cells (DMFC)
Cathodes
Mass transfer
Anodes
Air
Parallel flow
Open circuit voltage
Channel flow
Etching
Flow fields
Carbon dioxide
Methanol
Current density
Stainless steel
Chemical activation
Flow rate
Membranes
Hydrogen
Electrodes
Oxygen

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Lu, G. Q. ; Lim, P. C. ; Liu, F. Q. ; Wang, Chao Yang. / On mass transport in an air-breathing DMFC stack. In: International Journal of Energy Research. 2005 ; Vol. 29, No. 12. pp. 1041-1050.
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On mass transport in an air-breathing DMFC stack. / Lu, G. Q.; Lim, P. C.; Liu, F. Q.; Wang, Chao Yang.

In: International Journal of Energy Research, Vol. 29, No. 12, 10.10.2005, p. 1041-1050.

Research output: Contribution to journalArticle

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AB - An 8-cell air-breathing direct methanol fuel cell (DMFC) stack with the active area of 5 cm2 of each cell has been developed. Stainless steel plates of 500 μm thickness with flow channels were fabricated using photochemical etching method as the current collectors. Different conditioning methods for membrane electrode assembly (MEA) activation were discussed. With proper control of water crossover to the cathode, cathode flooding was avoided in the DMFC stack. Methanol crossover at open circuit voltage (OCV) in the air-breathing DMFC was measured. Further, it was found that flow maldistribution might occur in the parallel flow field of the stack, making carbon dioxide gas management at the anode necessary. Using humidified hydrogen in the anode with a high flow rate, the oxygen transport limiting current density was characterized and found to be sufficient in the air-breathing cathode. The stack produced a maximum output power of 1.33 W at 2.21 V at room temperature, corresponding to a power density of 33.3 mW cm-2.

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