6533b7defe1ef96bd127666f

RESEARCH PRODUCT

Electrochemical characterization of cobalt cordierites attached to paraffin-impregnated graphite electrodes

Francisco Jose TorresJavier AlarcónAntonio Doménech-carbó

subject

inorganic chemicalsAluminateInorganic chemistryOxidechemistry.chemical_elementElectrolyteCondensed Matter PhysicsElectrochemistrychemistry.chemical_compoundchemistryElectrodeElectrochemistryGeneral Materials ScienceElectrical and Electronic EngineeringCobaltDissolutionVoltammetry

description

The electrochemistry of α, β and μ cobalt-containing cordierites (Co2Al4Si5O18) attached to paraffin-impregnated graphite electrodes has been studied by linear scan and cyclic voltammetries in HCl+NaCl and NaOH electrolytes. This electrochemistry is compared with that of vitreous cobalt cordierite, cobalt(II) oxide and cobalt spinel aluminate (CoAl2O4), the two last taken as reference materials. Electrochemical processes involve the site-characteristic reduction of Co(II) species to cobalt metal near to −0.5 V vs. SCE and their oxidative dissolution near +0.3 V, accompanied by solid state interconversion between Co(II) and Co(III) at potentials above +0.45 V. Cordierite-modified electrodes display a significant site-dependent catalytic effect on the electrochemical oxidation of mannitol in 0.10 M NaOH.

yearjournalcountryeditionlanguage
2004-01-01Journal of Solid State Electrochemistry
https://doi.org/10.1007/s10008-003-0443-3