Figure 4
Electrochemical analyses of mesoporous Pt supported on carbon and ionomer films. The mesoporous Pt was prepared by electrodeposition for 30 s, 3 min, or 10 min. (a) Cyclic voltammetry (CV) profiles obtained at a scan rate of 100 mV/s while immersing the mesoporous Pt samples in a solution of 0.5 M H2SO4. (b) A Levich plot of the mass activity for each type of mesoporous Pt to the oxygen reduction reaction (ORR) obtained at different electrode rotational speeds. Results are also included for a catalyst ink prepared using commercially available Pt nanoparticles (NPs).
