Carbon supported PtRh catalysts for ethanol oxidation in alkaline direct ethanol fuel cell

✍ Scribed by S.Y. Shen; T.S. Zhao; J.B. Xu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 996 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.08.107

✦ Synopsis

Owing to the formation of an oxametallacyclic conformation, the CeC bond cleavage is the preferential channel for the ethanol dissociation on the Rh surface, the addition of Rh to Pt can increase the CO 2 yield during the ethanol oxidation. However, in acidic media the slow oxidation kinetics of CO ads to CO 2 limits the overall reaction rate. In this work, we prepare carbon supported PtRh catalysts and compare their catalytic activities with that of Pt/C in alkaline media. Cyclic voltammetry tests demonstrate that the Pt 2 Rh/C catalyst exhibits a higher activity for the ethanol oxidation than Pt/C does. Linear sweep voltammetry tests show that the peak current density on Pt 2 Rh/C is about 2.4 times of that on Pt/C. The enhanced electro-activity can be ascribed not only to the improved CeC bond cleavage in the presence of Rh, but also to the accelerated oxidation kinetics of CO ads to CO 2 in alkaline media.