Pt nanoparticles supported on nitrogen‑doped porous carbon as efficient oxygen reduction catalysts synthesized via a simple alcohol reduction method

摘要

Pt nanoparticles supported on nitrogen-doped porous carbon (NPC) were investigated as both a highly active catalyst forthe oxygen reduction reaction (ORR) and a suitable porous support structure. Pt/NPC catalysts with loadings of 8.8–35.4wt.% were prepared via a simple alcohol reduction method and exhibited homogeneously dispersed Pt nanoparticleswith a small mean size ranging from 1.90 to 2.99 nm. X-ray photoelectron spectroscopy measurement suggested thepresence of strong interactions between the Pt nanoparticles and NPC support. 27.4% Pt/NPC demonstrated high catalyticactivity for the ORR in a rotating disk electrode system and was also effectively applied to a gas diffusion electrode(GDE). A GDE fabricated using the Pt/NPC with a fine pore network exhibited excellent performance, especially at highcurrent densities. Specific activity of Pt/NPC and Pt/carbon black catalysts for the ORR correlated with the peak potentialof adsorbed OH reduction on Pt, which was dependent on the particle size and support.