A crack-free and super-hydrophobic cathode micro-porous layer for direct methanol fuel cells

X. H. Yan, T. S. Zhao, Liang An, G. Zhao, L. Zeng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

43 Citations (Scopus)

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 languageEnglish
Pages (from-to)331-336
Number of pages6
JournalApplied Energy
Volume138
DOIs
Publication statusPublished - 5 Jan 2015
Externally publishedYes

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
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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