An electrochemical technique using thin Pt wires as working electrodes was employed to determine the concentration of peroxide within the proton exchange membrane (PEM) of operating fuel cells. The existence of hydrogen peroxide was clearly observed, and its concentration depended primarily on membrane thickness, with thinner membranes displaying higher peroxide concentrations. H 2 O 2 is most likely formed on the anode side of the cell through reduction of O 2 .
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Liu et al. (2005) studied this question.
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