Abstract
A critical issue in operating passive direct methanol fuel cells (DMFCs) with neat methanol is finding a way to passively transport water generated at the cathode to the anode through membranes. This is so that the water required for anodic methanol oxidation can be compensated. The corresponding water flux depends on the capillary pressure created by the cathode micro-porous layer (MPL). Conventional MPLs made of carbon powder suffer from the problem of mud-cracks, significantly reducing the capillary pressure. In this work, we propose a cathode MPL prepared with fluorinated carbon nanotubes. It is demonstrated that the fluorinated nanotube MPL has no mud-cracks and its contact angle is as high as 153°. The application of the crack-free and super-hydrophobic MPL to a passive DMFC operating with neat methanol enables a significant increase in the water recovery flux, improving the anodic methanol oxidation reaction and thereby boosting the cell performance.
Original language | English |
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Pages (from-to) | 331-336 |
Number of pages | 6 |
Journal | Applied Energy |
Volume | 138 |
DOIs | |
Publication status | Published - 5 Jan 2015 |
Externally published | Yes |
Keywords
- Cathode micro-porous layer
- Direct methanol fuel cell
- Neat methanol operation
- Superhydrophobicity
- Water management
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- General Energy
- Mechanical Engineering
- Management, Monitoring, Policy and Law