Bio-composite membrane electrolytes for direct methanol fuel cells

S. Mohanapriya, A. K. Sahu, S. D. Bhat, S. Pitchumani, P. Sridhar, C. George, N. Chandrakumar, A. K. Shukla

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A new class of bio-composite polymer electrolyte membranes comprising chitosan (CS) and certain biomolecules in particular, plant hormones such as 3-indole acetic acid (IAA), 4-chlorophenoxy acetic acid (CAA) and 1-naphthalene acetic acid (NAA) are explored to realize proton-conducting bio-composite membranes for application in direct methanol fuel cells (DMFCs). The sorption capability, proton conductivity and ion-exchange capacity of the membranes are characterized in conjunction with their thermal and mechanical behaviour. A novel approach to measure the permeability of the membranes to both water and methanol is also reported, employing NMR imaging and volume localized NMR spectroscopy, using a two compartment permeability cell. A DMFC using CS-IAA composite membrane, operating with 2M aqueous methanol and air at 70C delivers a peak power density of 25 mWcm2 at a load current density of 150 mAcm2. The study opens up the use of bio-compatible membranes in polymer-electrolyte-membrane fuel cells.

Original languageEnglish (US)
Pages (from-to)B1319-B1328
JournalJournal of the Electrochemical Society
Volume158
Issue number11
DOIs
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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