The effect of methanol concentration on the performance of a passive DMFC

Abstract A passive, air-breathing liquid feed direct methanol fuel cell (DMFC), with no external pumps or other auxiliary devices, was designed, fabricated and tested with different methanol concentrations. It was found that the cell performance was improved substantially with an increase in methanol concentration; a maximum of power density of 20 mW/cm 2 was achieved with 5.0 M methanol solution. The measurements indicated that the better performance with higher methanol concentrations was mainly attributed to the increase in the cell operating temperature caused by the exothermic reaction between permeated methanol and oxygen on the cathode. This finding was subsequently confirmed by the fact that the cell performance was degraded, when the cell running with higher methanol concentrations was cooled down to room temperature.

[1]  D. Linden.  Handbook Of Batteries , 2001 .

[2]  C. Chen,et al.  Performance of an air-breathing direct methanol fuel cell , 2003 .

[3]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[4]  Won-Yong Lee,et al.  Pore size effect of the DMFC catalyst supported on porous materials , 2003 .

[5]  Addition of non-reacting gases to the anode flow field of DMFCs leading to improved performance , 2004 .

[6]  Qiang Ye,et al.  In situ visualization study of CO2 gas bubble behavior in DMFC anode flow fields , 2005 .

[7]  T. Zhao,et al.  A palladium-alloy deposited Nafion membrane for direct methanol fuel cells , 2003 .

[8]  Emanuel Peled,et al.  Water-neutral micro direct-methanol fuel cell (DMFC) for portable applications , 2003 .

[9]  Qin Xin,et al.  Study of sintered stainless steel fiber felt as gas diffusion backing in air-breathing DMFC , 2004 .

[10]  S. Srinivasan,et al.  International activities in DMFC R&D: status of technologies and potential applications , 2004 .

[11]  T. Zhao,et al.  Synthesis and physical/electrochemical characterization of Pt/C nanocatalyst for polymer electrolyte fuel cells , 2004 .

[12]  In-Hwan Oh,et al.  Recent progress in passive direct methanol fuel cells at KIST , 2004 .

[13]  Keith Scott,et al.  Engineering aspects of the direct methanol fuel cell system , 1999 .

[14]  A. Kulikovsky.  A method for analysis of DMFC performance curves , 2003 .

[15]  Zhaobin Wei,et al.  Influence of electrode structure on the performance of a direct methanol fuel cell , 2002 .

[16]  Jaesung Han,et al.  Direct methanol fuel-cell combined with a small back-up battery , 2002 .