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Noble Metal‐Free Oxidative Electrocatalysts: Polyaniline and Co(II)‐Polyaniline Nanostructures Hosted in Nanoporous Silica
Author(s) -
Silva Rafael,
Asefa Tewodros
Publication year - 2012
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201104126
Subject(s) - polyaniline , electrocatalyst , materials science , ascorbic acid , overpotential , nanoporous , nanocomposite , mesoporous silica , mesoporous material , inorganic chemistry , chemical engineering , electrochemistry , catalysis , nanotechnology , electrode , polymerization , chemistry , organic chemistry , polymer , composite material , food science , engineering
An efficient nanocomposite electrocatalyst composed of mesoporous silica (SBA‐15) with polyaniline (PANI) nanostructures within its channel pores (PANI/SBA‐15) is synthesized and characterized. The resulting PANI/SBA‐15 is capable of chelating Co(II) ions, presumably via its nitrogen atoms on PANI/diamine groups. Both the metal‐free (SBA‐15/PANI) and the Co(II)‐doped SBA‐15/PANI nanocomposite materials showed high electrocatalytic activity for oxidation of L‐ascorbic acid, with very low overpotential and high current density. The activity of PANI/SBA‐15 toward oxidation of L‐ascorbic acid is comparable to that obtained from a conventional Pt/C electrocatalyst.