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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer-Verlag

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DOI

10.1007/978-3-319-07653-9_56

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1433-0768

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Cyclic voltammetry and electrochemical quartz crys

Authors: Leonardo Salgado Gabriel Trejo Yunny Meas Teresa Zayas
Publish Date: 2005/08/17
Volume: 10, Issue: 4, Pages: 230-235
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Abstract

The adsorption properties of a rhodized platinum electrode in sulfuric acid were studied through simultaneous cyclic voltammetry CV and electrochemical quartz crystal microbalance EQCM measurements The processes occurring at the Rh surface during the potential scan between 004 and 13 V were analyzed in terms of the changes in mass and charge The apparent molar masses of the species adsorbed on Rh in different potential regions were determined from the mass–charge correlation The results obtained suggest that the desorption of hydrogen UPD initially occurs in conjunction with the incorporation of mass due to the adsorption of bisulfate/sulfate ions between 004 V and 012 V the apparent molar mass M 1 in this potential region is consistent with that of bisulfate ion assuming that one sulfate species occupies the site originally occupied by five H atoms Between 012 V and 020 V the apparent molar mass M 2 is less than M 1 This result may be associated with a structural rearrangement of the adsorbed sulfate species The apparent molar mass M 3 was determined in the potential region of 020–056 V the value obtained for M 3 suggests that the adsorbed species are hydrated bisulfate ions HSO 4 − ·4H2O Additionally it was found that Rh oxides formed at the surface between 056 V and 13 V could not be directly identified from the correlation between charge and mass

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