Catalyst of Pt nanoparticles loaded on multi-walled carbon nanotubes with high activity prepared by electrodeposition without supporting electrolyte.

Highlights: [•] Development of an electrochemical method to prepare catalyst of Pt nanoparticles supported on MWCNTs (Pt/MWCNTs). [•] The surface structure of the Pt/MWCNTs were characterized by high-magnification TEM and COad stripping analysis. [•] The high catalytic activity and stability of the Pt/MWCNTs are attributed to high density of step atoms on Pt nanoparticles’ surface. [•] Diffusion controlling process has been studied and discussed as a possible mechanism of formation of surface step atoms. [ABSTRACT FROM AUTHOR]