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Carbon Nanomaterial–Phosphomolybdate Composites for Oxidative Electrocatalysis
Author(s) -
Fernandes Diana M.,
Freire Cristina
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.201402271
Subject(s) - electrocatalyst , nanocomposite , vanadium , graphene , nanomaterials , electrochemistry , ascorbic acid , carbon nanotube , materials science , redox , polyoxometalate , carbon fibers , glassy carbon , inorganic chemistry , nanotechnology , chemical engineering , electrode , composite number , chemistry , catalysis , composite material , cyclic voltammetry , organic chemistry , metallurgy , food science , engineering
Novel hybrid nanocomposites based on the immobilisation of tetrabutylammonium salts of phosphomolybdates (PMo 12 , PMo 11 , PMo 11 V, and PMo 10 V 2 ) on single‐walled carbon nanotubes or graphene flakes were prepared. Glassy carbon electrodes modified with carbon nanocomposites produce cyclic voltammograms that are consistent with surface‐confined redox processes attributed to Mo‐centred reduction (Mo VI →Mo V ) and vanadium reduction (V V →V IV ) for PMo 11 V and PMo 10 V 2 . Furthermore, they show very high stabilities and well‐resolved redox peaks with high current intensities. The observed enhancement of the electrochemical properties of polyoxometalates (POMs) is a consequence of strong electronic communication between POMs and carbon nanomaterials. Nanocomposites of vanadium–phosphomolybdates exhibit superior V‐based electrocatalytic properties towards ascorbic acid oxidation in comparison with free POMs; moreover, PMo 11 V@graphene shows an outstanding sensing performance for the detection of dopamine.