Abstract
Independent transport measurements of carbon dioxide permeation were undertaken to evaluate a standard assumption of attributing cathodic flux in direct methanol fuel cells (DMFCs) entirely to methanol crossover. With a humid air cathode at ambient conditions, a DMFC cathode emanated 3.5 to of (20 to 25 mA/cm2 “leak current density”). From a methanol-free anode feed of either carbonated liquid water or humid gas (90%:10%), carbon dioxide permeated to the cathode at or 20% of the total DMFC flux. Under current (enabled with the presence of in the permeation rate rose to The rise with cell current density increase from 24 to 80 mA/cm2 was quantitatively consistent with convection of with electro-osmosis of water. The indication that anodic contributes to the total cathodic flux has a positive implication for fuel efficiency in DMFCs. © 2004 The Electrochemical Society. All rights reserved.
Published Version
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