Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 116, Issue 25, Pages 6497-6504Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp212310v
Keywords
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Funding
- Fondazione Cariplo [2010-0506]
- Italian Ministry of Education, University and Research [PRIN 2008PF9TWZ, 2008N7CYL5]
- Universita degli Studi di Milano
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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.
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