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Electrochemical oxidation of oxalic acid and hydrazinium nitrate on platinum in nitric acid media

Rockombeny, L.C. and Féraud, Jean-Pierre and Queffelec, Benoit and Ode, Denis and Tzedakis, Theodore Electrochemical oxidation of oxalic acid and hydrazinium nitrate on platinum in nitric acid media. (2012) Electrochimica Acta, vol. 66 . pp. 230-238. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2012.01.080

Abstract

Several studies in the literature have investigated the electrochemical effects of oxalic acid and hydrazine on various materials in neutral (pH buffered to 7), basic or weakly acidic media (pH 6). The present work proposes electrochemical techniques that allow for the study of the electrochemical behavior, on a Pt electrode, of oxalic acid and hydrazinium nitrate to better understand their oxidation mechanisms in a nitric acid medium at a pH below 1; in addition, some experiments were carried out to define an electrochemical method that would allow for the simultaneous detection of these species when present within process effluent in very acidic solutions. Some physical data regarding oxalic acid and hydrazinium nitrate were also determined: anodic oxidation of hydrazinium nitrate and oxalic acid were observed at 0.2 V and 0.7 V (vs. Ag/AgCl), respectively. The diffusion coefficients of hydrazinium nitrate and oxalic acid were found to be 5.2 × 10−6 and 2.9 × 10−7 cm2 s−1, respectively. An experimental design approach demonstrated the influence of nitric acid concentrations on the diffusion coefficients of these species.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at : http://www.sciencedirect.com/science/article/pii/S001346861200120X
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Société Internationale d'Etudes et de Réalisations pour les organismes publics et privés - SIER (FRANCE)
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Deposited By: Audrey LEFEVRE
Deposited On:13 Jul 2012 14:18

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