Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/18208
Title: Pd-based cathode catalysts for direct methanol fuel cells
Authors: YANG JINHUA
Keywords: Galvanic replacement reaction, Oxygen reduction reaction, Core shell nanoparticles, Direct methanol fuel cells
Issue Date: 31-Jul-2009
Source: YANG JINHUA (2009-07-31). Pd-based cathode catalysts for direct methanol fuel cells. ScholarBank@NUS Repository.
Abstract: The direct methanol fuel cell (DMFC) technology is beset with the problem of fuel (methnaol) crossover from the anode to cathode. The fuel crossover problem does not only represent a fuel loss, but can also seriously undermine the cathode efficiency by lowering the cathode potential and the catalyst activity in the oxygen reduction reaction (ORR). Since the current progress in the development of methanol-blocking polymer electrolyte membranes has yet to deliver the complete solution, our objectives are to address the fuel crossover problem through the use of fuel-tolerant cathode catalysts. These catalysts are designed to be selective to ORR even in the presence of a significant amount of the penetrated fuel. Herein, we have adopted a rational approach in the cathode catalyst design. Our methodology is to use structured catalysts with different core and shell components for more tunability of the activity of the catalytic metals. These catalysts may be prepared by simple galvanic replacement reactions which can be scaled up for volume production. We found that carbon-supported core shell Pd@Pt and PdM@PdPt catalysts (where M=Ni, Co, Fe and Cr) can provide us with the greatest latitude in activity and selectivity tuning. Compared with common Pt/C catalysts, the Pd@Pt and PdM@PdPt catalysts utilize less platinum, and yet display favorable catalytic outcomes in terms of ORR activity and selectivity (methanol tolerance).
URI: http://scholarbank.nus.edu.sg/handle/10635/18208
Appears in Collections:Ph.D Theses (Open)

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