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• W2046348462 abstract "The reaction characteristics of Se-modified Ru/C catalysts (RuSey/C; y = 0−1) for the direct methanol fuel cell cathode application were determined in model studies, combining quantitative differential electrochemical mass spectrometry, rotating ring-disk electrode, and wall-jet disk electrode measurements. The experiments were performed under fuel cell relevant, but nevertheless, well-defined reaction conditions (continuous mass transport, elevated temperatures, and negligible internal diffusion resistance). Se modification affects both the activity for the O2 reduction reaction (ORR) and the selectivity for H2O and H2O2 formation, while methanol oxidation is in all cases negligible. Specifically, Se modification improves the O2 reduction activity and reduces the tendency for H2O2 formation in the technically relevant potential region of 0.6−0.8 V. The presence of methanol has little effect on the ORR characteristics on the RuSey/C catalysts, while on Pt/C, it leads to a rapid increase of the H2O2 yield at potentials of 0.4 V. Temperature-dependent measurements of the ORR activity result in activation energies of 18−24 kJ mol-1 for the RuSey/catalysts (at 0.7 V), comparable to the value obtained on Pt/C (18 kJ mol-1). On Ru/C, the ORR activity increases up to 50 °C (Eact = 24 kJ mol-1) and then drops again at higher temperatures, due to surface blocking via thermally activated oxide/hydroxide formation. The additional overpotential for O2 reduction of 0.2 V as compared to the Pt/C catalyst and, in particular, the significant H2O2 yield of at least 1% at typical cathode operation potentials, which will adversely affect the long-term stability of membrane and electrode, require significant improvements before application as cathode catalyst becomes feasible." @default.
• W2046348462 created "2016-06-24" @default.
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• W2046348462 date "2006-12-16" @default.
• W2046348462 modified "2023-10-16" @default.
• W2046348462 title "Activity, Selectivity, and Methanol Tolerance of Se-Modified Ru/C Cathode Catalysts" @default.
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• W2046348462 doi "https://doi.org/10.1021/jp0645925" @default.
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