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An experimental DMFC, designed and manufactured in-house, was used in this study. Three graphite anode plates were machined with the same flow channel configuration, but different channel depths. By comparing the RHE polarization with the methanol-oxygen polarization experiments, polarization losses at the oxygen cathode accounted for 40-50% of the overpotential. Polarization measurements indicate that the medium-depth flow channels performed better than either the shallow or deep flow channels, indicating that there is a complex relationship between the effect of flow velocity and the influence of the rate of production of product CO 2. In the case of the shallow channel anode, AC impedance spectroscopy revealed that it took considerably longer ro achieve steadystate than for the medium and deep channels.
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## Abstract A novel series of polyaromatic ionomers with similar equivalent weights but very different sulphonic acid distributions along the ionomer backbone has been designed and prepared. By synthetically organising the sequence‐distribution so that it consists of fully defined ionic segments (c
A novel in‐situ cell was designed to allow measurements during real fuel cell operation. Thus, potential and fuel dependent changes in the catalyst structure can be pursued in‐situ. The X‐ray absorption cell was built first in transmission geometry with an inherent graphite beam window, and spectra
A surface treatment to modify passive film properties formed on 316L stainless steel has been designed for bipolar plate application in PEMFC systems. This one is based on cerium insertion from electrochemical technique. The effect of this element addition on the composition of the passive films was