IrO2-based disperse-phase electrocatalysts : a complementary study by means of the cavity-microelectrode and ex-situ X-ray absorption spectroscopy
Articolo
Data di Pubblicazione:
2012
Citazione:
IrO2-based disperse-phase electrocatalysts : a complementary study by means of the cavity-microelectrode and ex-situ X-ray absorption spectroscopy / A. Minguzzi, C. Locatelli, G. Cappelletti, M. Scavini, A. Vertova, P. Ghigna, S. Rondinini. - In: JOURNAL OF PHYSICAL CHEMISTRY. A, MOLECULES, SPECTROSCOPY, KINETICS, ENVIRONMENT, & GENERAL THEORY. - ISSN 1089-5639. - 116:25(2012), pp. 6497-6504.
Abstract:
In this work, IrO2-based powders are screened by cyclic
voltammetry for the determination of the electrochemical active sites
and for the qualitative evaluation of the iridium atoms speciation. All
results are obtained using a cavity-microelectrode as powder holder,
thus exploiting the features of this innovative tool, whose best
potentialities have been recently introduced by our group. All the
studied materials have been prepared by the sol−gel technique and
differ in calcination temperature and method of mixing the metal oxide
precursors. The electrochemical results are complemented with the
information obtained by X-ray absorption spectroscopy (XAS), that give
insights on the local structure of each selected sample, confirming the
trends found by cyclic voltammetry and give new and unexpected
insights on the powder structural features.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
A. Minguzzi, C. Locatelli, G. Cappelletti, M. Scavini, A. Vertova, P. Ghigna, S. Rondinini
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