Platinum-deposited mesoporous carbon (Pt/MC) catalyst has revealed an interesting response toward oxygen reduction. Its thin-layer rotating disk electrode (RDE) has shown characteristic oxygen reduction current that does not depend on oxygen diffusion through the electrolyte solution, while Pt-deposited carbon black (Pt/ CB) thin-layer RDE shows diffusion-limited current. This is due to unique oxygen transfer and storage occurring within the 7-8 nm sized mesopores of MC support, which do not exist in CB support. With a Pt/MC thin-layer electrode, mesopores can produce an ionomer-filled channel connecting catalysts and external environment and favorably transferring oxygen. Also, even after oxygen inside the pores is used up, oxygen can be restored during the potential cycling.
|Number of pages||5|
|Journal||Journal of Physical Chemistry C|
|Publication status||Published - Jul 16 2009|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films