A proton exchange membrane fuel cell was used as a flow reactor for continuous preferential oxidation of CO over from 1.0% CO in under pulse-potential control. By varying the pulse profile ( e.g. , on-time, off-time, pulse potential) the CO and oxidation currents were varied independently. The improvement in faradaic selectivity between CO and oxidation results from the promotion of CO adsorption during the off ( i.e. , open-circuit) portion of the pulse. Therefore, during the on portion CO oxidation was preferred while the surface was covered with CO.
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Lakshmanan et al. (2002) studied this question.
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