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Oxygen Reduction at Shape‐Controlled Platinum Nanoparticles and Composite Catalysts Based on (100)Pt Nanocubes on Microporous–Mesoporous Carbon Supports
Author(s) -
Grozovski Vitali,
Kasuk Heili,
Nerut Jaak,
Härk Eneli,
Jäger Rutha,
Tallo Indrek,
Lust Enn
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500021
Subject(s) - microporous material , catalysis , materials science , mesoporous material , cyclic voltammetry , carbon fibers , electrochemistry , platinum , nanoparticle , platinum nanoparticles , chemical engineering , rotating disk electrode , glassy carbon , inorganic chemistry , carbide , graphene , composite number , electrode , chemistry , nanotechnology , composite material , organic chemistry , engineering
The electrochemical oxygen reduction reaction (ORR) on bare (100)Pt nanoparticles supported by molybdenum‐carbide‐derived carbon [(100)Pt–C(Mo 2 C)] with high specific surface area and controlled microporosity–mesoporosity, pore size distribution, electrical conductivity, and corrosion stability was studied in 0.5 M H 2 SO 4 solution by using rotating‐disk‐electrode and cyclic voltammetry methods. The C(Mo 2 C) powder was prepared from Mo 2 C at a fixed chlorination temperature (750 °C). Pt nanoparticles were prepared through colloid chemistry and deposited onto/into C(Mo 2 C) and Vulcan XC72 carbon supports for comparison. The ORR cathodic current densities and half‐wave potentials strongly depend on the characteristics of the carbon material used as the support. High values for the ORR current density were calculated for (100)Pt–C(Mo 2 C) and the half‐wave potential is nearly 80 mV more positive compared with that for the (100)Pt–Vulcan XC72 catalyst with a similar catalyst loading.