Nanocomposite electrodes based on pre-synthesized organically capped platinum nanoparticles and carbon nanotubes. Part II: Determination of diffusion area for oxygen reduction reflects platinum accessibility

► Combination of carbon nanotubes and capped platinum electrocatalyst for ORR. ► Diffusion area for ORR is determined inporous electrode structures. ► Diffusion area is related to platinum loading. ► The lower the platinum coverage density the higher the diffusion area. ► Diffusion area relates toelectrocatalyst accessibility on its carbon support.