کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1276282 | 1497554 | 2012 | 10 صفحه PDF | دانلود رایگان |
The ethanol electro-oxidation behaviors of Pt/C and Pd/C in alkaline media were compared using potentiodynamic and potentiostatic methods. Various ethanol and alkaline concentrations were studied. In addition, the temperature effect of ethanol oxidation was investigated. The Pd/C showed a higher activity toward ethanol oxidation than the Pt/C, especially in the potentiostatic measurement. This is mainly due to the higher oxyphilic characteristics of the Pd/C and the relatively inert nature of the Pd/C on C–C bond cleavage. The apparent activation energies of the ethanol oxidation on the Pd/C in alkaline media varied from 26.6 to 30.4 kJ mol−1, depending on the potentials. The Tafel slopes could be divided into two parts on both catalysts: at low overpotentials, the Tafel slope on both the Pt/C and the Pd/C was close to 120 mV dec−1 at all temperatures; at high overpotentials, the Tafel slope was ca. 260 mV dec−1 on the Pd/C at all temperatures, but was much higher on the Pt/C, especially at high temperatures. Based on these results, it is concluded that Pd/C has less poisoning effect and higher activity than Pt/C for selective oxidation of ethanol to acetate.
► The ethanol oxidation behaviors of Pt/C and Pd/C at varying ethanol and alkaline concentrations were studied.
► The temperature effects of ethanol oxidation on Pt/C and Pd/C were also investigated.
► The Pd/C showed a higher activity toward ethanol oxidation than the Pt/C.
► The ethanol oxidation mechanism on Pt/C and Pd/C catalysts in alkaline media were discussed.
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 15, August 2012, Pages 11185–11194