Low crossover of methanol and water through thin membranes in direct methanol fuel cells

Fuqiang Liu, Guoqiang Lu, Chao-yang Wang

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

Low crossover of both methanol and water through a polymer membrane in a direct methanol fuel cell (DMFC) is essential for using high concentration methanol in portable power applications. A novel design of the membrane-electrolyte assembly (MEA) has been developed in this work to attain low methanol crossover, low water crossover, and high cell performance simultaneously. The anode catalyst layer, in the form of a catalyzed diffusion medium (CDM), serves as a methanol diffusion barrier to reduce methanol crossover. In addition, a highly hydrophobic cathode microporous layer (MPL) is employed to build up the hydraulic pressure at the cathode and hence drive the product water from the cathode into the anode to offset the water dragged by electro-osmosis. The new MEA, consisting of a CDM anode, a thin Nafion membrane, and a carbon cloth precoated with an MPL on the cathode, is shown to attain: (i) a net water transport coefficient through the membrane smaller than 0.8 at 60°C and 0.4 at 50°C; (ii) fuel efficiency of ∼80%; and (iii) a steady-state power density of 60 mW cm2 at ca. 0.4 V and 60°C with low stoichiometric flow rates of ambient dry air and 3 M methanol solution.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume153
Issue number3
DOIs
StatePublished - Feb 13 2006

Fingerprint

Direct methanol fuel cells (DMFC)
fuel cells
Methanol
crossovers
methyl alcohol
membranes
Membranes
Water
Cathodes
water
cathodes
Anodes
anodes
Electrolytes
Electroosmosis
assembly
electrolytes
Diffusion barriers
osmosis
Polymers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrochemistry

Cite this

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abstract = "Low crossover of both methanol and water through a polymer membrane in a direct methanol fuel cell (DMFC) is essential for using high concentration methanol in portable power applications. A novel design of the membrane-electrolyte assembly (MEA) has been developed in this work to attain low methanol crossover, low water crossover, and high cell performance simultaneously. The anode catalyst layer, in the form of a catalyzed diffusion medium (CDM), serves as a methanol diffusion barrier to reduce methanol crossover. In addition, a highly hydrophobic cathode microporous layer (MPL) is employed to build up the hydraulic pressure at the cathode and hence drive the product water from the cathode into the anode to offset the water dragged by electro-osmosis. The new MEA, consisting of a CDM anode, a thin Nafion membrane, and a carbon cloth precoated with an MPL on the cathode, is shown to attain: (i) a net water transport coefficient through the membrane smaller than 0.8 at 60°C and 0.4 at 50°C; (ii) fuel efficiency of ∼80{\%}; and (iii) a steady-state power density of 60 mW cm2 at ca. 0.4 V and 60°C with low stoichiometric flow rates of ambient dry air and 3 M methanol solution.",
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Low crossover of methanol and water through thin membranes in direct methanol fuel cells. / Liu, Fuqiang; Lu, Guoqiang; Wang, Chao-yang.

In: Journal of the Electrochemical Society, Vol. 153, No. 3, 13.02.2006.

Research output: Contribution to journalArticle

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