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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A voltammetric and nanogravimetric study of Te underpotential deposition on Pt in perchloric acid medium

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Author(s):
Machado, S. A. S. ; Santos, Mauro Coelho dos [2]
Total Authors: 2
Document type: Journal article
Source: Electrochimica Acta; v. 50, n. 11, p. 2289-2295, Apr. 2005.
Field of knowledge: Physical Sciences and Mathematics - Chemistry
Abstract

This work describes the study of Te underpotential deposition on Pt in acid media using cyclic voltammetry, rotating ring-disc electrode and electrochemical quartz crystal microbalance techniques. The voltammetric results indicate the presence of two dissolution peaks in the positive scan with a total charge density of 420 mu C cm(-2). These phenomena are attributed to the deposition of one Te monolayer with the occupancy of two active Pt sites by each ad-atom. This is confirmed by rotating ring-disc electrode results. The electrochemical quartz crystal microbalance (EQCM) experiments yielded the small mass variation of -32 ng cm(-2) (while the theoretical one is -140.4 ng cm(-2) for a complete Te monolayer). This low value can be attributed to the simultaneous adsorption of water, perchlorate anions and the formation of platinum oxide. (AU)