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.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films