Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 86: Issue 2
Thermal analysis and electrochemical study of Hg reactions on Pt–30% Ir alloy electrode
Authors:
E. Milaré Universidade Estadual Paulista Instituto de Química Araraquara, São Paulo Brazil CEP 14.801-970 C.P. 355

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J. Turquetti Universidade Estadual Paulista Instituto de Química Araraquara, São Paulo Brazil CEP 14.801-970 C.P. 355

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G. Souza Universidade Estadual Paulista Instituto de Química Araraquara, São Paulo Brazil CEP 14.801-970 C.P. 355

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A. Benedetti Universidade Estadual Paulista Instituto de Química Araraquara, São Paulo Brazil CEP 14.801-970 C.P. 355

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F. Fertonani Universidade Estadual Paulista Instituto de Química Araraquara, São Paulo Brazil CEP 14.801-970 C.P. 355

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Pages:
403–410
Online Publication Date:
12 Oct 2006
Publication Date:
01 Nov 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-7147-0
Keywords:
alloy; cyclic voltammetry; SXR; thermogravimetry
Restricted access

Abstract  

Thermogravimetry (TG), cyclic voltammetry (CV) and other analytical techniques were used to study the reactions of mercury with Pt–30% Ir alloy. The results allowed to suggest that an electrodeposited mercury film interacts with the substrate and when subjected to heat or electrochemical removal at least four mass loss steps or five peaks appeared during the mercury desorption process. The first two steps were attributed to Hg(0) removal probably from the bulk and from the adsorbed monolayer which wets the electrode surface. These two processes are responsible for peaks D and F in the cyclic voltammograms. The last two peaks (G, H) in CV were ascribed to the intermetallic compound decomposition. In TG curves, the last two steps were attributed to the PtHg4 (third step), and PtHg2 decomposition followed by Hg removal from the subsurface. The PtHg2 was formed by an eutectoide reaction: PtHg→PtHg2+Hg(Pt–Ir). The Hg diffused to the subsurface was not detectable by cyclic voltammetry.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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