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Cobalt‐Based Active Species Molecularly Immobilized on Carbon Nanotubes for the Oxygen Reduction Reaction
Author(s) -
Kim Sujin,
Jang Dawoon,
Lim Joonwon,
Oh Junghoon,
Kim Sang Ouk,
Park Sungjin
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701038
Subject(s) - catalysis , cobalt , methanol , electrochemistry , heteroatom , carbon nanotube , oxygen reduction reaction , molecule , materials science , chemistry , electrocatalyst , chemical engineering , combinatorial chemistry , nanotechnology , inorganic chemistry , electrode , organic chemistry , ring (chemistry) , engineering
Hybrid systems in which molecule‐based active species are combined with nanoscale materials may offer valuable routes to enhance catalytic performances for electrocatalytic reactions. The development of rationally designed, cost‐effective, efficient catalysts for the oxygen reduction reaction (ORR) is a crucial challenge for applications in fuel cells and metal–air batteries. A new hybrid ORR catalyst has been synthesized through a well‐defined reaction between Co‐based organometallic molecules and N‐doped multiwalled carbon nanotubes (MWCNTs) at room temperature. The hybrid ORR catalyst shows excellent catalytic performance with an onset potential of 0.95 V [vs. the reversible hydrogen electrode (RHE)], superior durability, and good methanol tolerance. Chemical and structural characterization after many reaction cycles reveals that the Co‐based organometallic species maintained the original structure of cobalt(II) acetylacetonate with coordination to the heteroatoms of the MWCNTs. A thorough electrochemical investigation indicates that the major catalytically active site is Co−O 4 −N CNT .