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Citation: YANG Juan, YUAN Ting, ZHANG Haifeng, LI Xuemei, DING Hanming, YANG Hui. Effect of Hydrophobicity of Anodic Backing Layer on Mass Transfer Characteristics of Passive DMFCs[J]. Chinese Journal of Applied Chemistry, ;2013, 30(11): 1348-1353. doi: 10.3724/SP.J.1095.2013.30033 shu

Effect of Hydrophobicity of Anodic Backing Layer on Mass Transfer Characteristics of Passive DMFCs

a. Department of Chemistry, East China Normal University, Shanghai 200062, China;
b. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

Received Date: 14 January 2013
Revised Date: 11 March 2013

The effect of the anode backing layer consisting of carbon papers with different polytetrafluoroethylene(PTFE) contents on the methanol mass transfer and cell performance of a passive direct methanol fuel cell (DMFC) was investigated by methanol permeability measurement.The membrane electrode assemblies(MEAs) were fabricated with the same anode catalyst layer,membrane and cathode.The experimental results showed that the methanol permeability decreased with the increase of PTFE contents in anode backing layer.It was found that PTFE-treated backing layer results in a lower limiting current density,which could be attributed primarily to the increased mass transfer resistance. When the PTFE content in the anode backing layer is up to 40%,the maximum power density of passive DMFC feeding with 9 mol/L methanol solution can achieve 32 × 10^-3 W/cm². Moreover,the use of a PTFE-treated backing layer also can decrease water transfer from the anode to the cathode,thus mitigating water flooding problem in the cathode.
- passive direct methanol fuel cell,
- anodic backing layer,
- hydrophobicity,
- methanol mass transfer,
- cathode water-flooding
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