Evaluation of the synergistic effects of a novel organic-inorganic nickel hybrid nanocomposite as electrocatalyst toward glucose oxidation

BONETTO, MARÍA CELINA; RINALDI, ANA L.; CARBALLO, ROMINA; SOBRAL, SANTIAGO

JOURNAL OF ELECTROANALYTICAL CHEMISTRY - (Print)

ELSEVIER SCIENCE SA

Año: 2020 vol. 863

1572-6657

A novel organic-inorganic hybrid nanocomposite obtained byelectro-copolymerization of multi-walled carbon nanotubes and [Ni-(Protoporphyrin IX)], and then decorated with nickel metal nanoparticles(NiPPIX/CNT/NiNp) has been successfully prepared for its use in the nonenzymaticoxidation of glucose.The structural characterization and the electrochemical evaluation of thecharge transport mechanisms for NiPPIX/NTC/NiNp were performed by SEMEDX,cyclic voltammetry (CV) and electrochemical impedance spectroscopy(EIS) measurements.The combination of two classes of electron hopping sites, nickelnanoparticles and the nickel atom of the porphyrin, embedded in anenvironment of high electronic delocalization and optimal filmpermeability, contributed to the electronic transfer processes, in termsof heterogeneous electron transfer rate constant (k°=1.6 x 10-4 cm s-1for NiPPIX/CNT/NiNp vs 2.4 x 10-5 cm s-1 for NiNp).NiPPIX/CNT/NiNp glassy carbon electrode shows the best linear responsefor glucose determination up to 6 mmol L-1, with a 0.9953 correlationcoefficient and a slope of 0.2689 mA L mmol-1 cm-2.Lastly, the association of homogeneously distributed catalytic centers isan interesting strategy for the design of nanomaterials for sensingpurposes.