A DEMS setup has been developed that allows for the detection of the gaseous and volatile reaction products of the liquid fed anode of a direct methanol fuel cell. Further, a DEMS sensor has been constructed by which the exhaust stream of a gaseous fed fuel cell can be analyzed. The adsorption and oxidation properties of carbon monoxide on alloyed PtRu nanoparticles have been examined. For methanol oxidation, a dual reaction meachanism has been found: In a serial pathway, the reaction product CO2 is produced via chemisorbed CO while, in a parallel pathway, weakly adsorbed intermediates are formed. By periodically applied anodic oxidation pulses an increase of the reaction kinetics could be achieved both for the I-DMFC and the DMFC. In both systems, the slight decrease of the CO coverage has been derived as cause for the accelarated fuel turnover.
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A DEMS setup has been developed that allows for the detection of the gaseous and volatile reaction products of the liquid fed anode of a direct methanol fuel cell. Further, a DEMS sensor has been constructed by which the exhaust stream of a gaseous fed fuel cell can be analyzed. The adsorption and oxidation properties of carbon monoxide on alloyed PtRu nanoparticles have been examined. For methanol oxidation, a dual reaction meachanism has been found: In a serial pathway, the reaction product CO...
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