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2003•Chinese Journal of Power SourcesRequires access

Electrochemical performance of a liquid feed direct methanol fuel cell

Yu Wang

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Abstract

Electrochemical performance of a liquid feed direct methanol fuel cell (DMFC) in various operating conditions were investigated by means of cyclic voltammetry, steadystate galvanostatic polarization and ACimpedance analysis. Effects of methanol concentration, cell temperature and oxygen pressure on electrode reactions were also analyzed. The results show that the discharge performance of DMFC is improved with the increasing of operating temperature and oxygen pressure. The improved kinetics and the delayed concentration polarization occur on the anode fed with highconcentration methanol, however, which also lead to more methanol crossover. The suitable methanol concentration for the optimal performance of DMFC is 2.0 mol/L.

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What this paper is about

Electrochemical performance of a liquid feed direct methanol fuel cell (DMFC) in various operating conditions were investigated by means of cyclic voltammetry, steadystate galvanostatic polarization and ACimpedance analysis. Effects of methanol concentration, cell temperature and oxygen pressure on electrode reactions were also analyzed. The results show that the discharge performance of DMFC is improved with the increasing of operating temperature and oxygen pressure. The improved kinetics and the delayed concentration polarization occur on the anode fed with highconcentration methanol, however, which also lead to more methanol crossover. The suitable methanol concentration for the optimal performance of DMFC is 2.0 mol/L.

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Available abstract

Electrochemical performance of a liquid feed direct methanol fuel cell (DMFC) in various operating conditions were investigated by means of cyclic voltammetry, steadystate galvanostatic polarization and ACimpedance analysis. Effects of methanol concentration, cell temperature and oxygen pressure on electrode reactions were also analyzed. The results show that the discharge performance of DMFC is improved with the increasing of operating temperature and oxygen pressure. The improved kinetics and the delayed concentration polarization occur on the anode fed with highconcentration methanol, however, which also lead to more methanol crossover. The suitable methanol concentration for the optimal performance of DMFC is 2.0 mol/L.

Key concepts: Direct methanol fuel cell, Methanol, Anode, Polarization (electrochemistry), Electrochemistry, Cyclic voltammetry, Chemistry, Methanol reformer

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