Volume 14, Issue 1, 1996
19th January, 2023
A New Approach to Current Efficiency Calculation in Magnesium Electrolysis
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by A. Antonyraj, T. Muthurocku, U. Shunmugam et al.
15-25
DOI: DOI: 10.4152/pea.199601015
Energy consumption in an electrolytic process is mainly governed by current efficiency and voltage efficiency. Hence an accurate calculation of the current efficiency will greatly help in evaluating energy data precisely. An attempt has been made in this study to perfect an alternate method for calculating the current efficiency (C.E.) from the chlorine gas liberated at the anode during magnesium chloride electrolysis. The anodic current efficiency (A.C.E.) thus obtained has been compared with the cathodic current efficiency (C.C.E.) calculated by metal basis. A difference between the two values has been observed and the reasons for such differences have been analyzed in this paper.
Estimation of Bypass Current in a Bipolar Electrode Stack-Magnesium Bipolar Cell
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by H. Padmanabha Sarma, A. Antonyraj, G .N. Kannan et al.
7-14
DOI: DOI: 10.4152/pea.199601007
A theoretical model based upon cell configuration (Resistive Network Model) is adopted for calculating the bypass current for a stack of bipolar electrodes used in molten salt electrolysis. A simplified bypass current calculation is also made by using experimentally obtained current and potential in the magnesium cells. The results obtained from both the models are compared and discussed particularly for two different electrolyte compositions.
by Victor M. M. Lobo
27-29
DOI: DOI: 10.4152/pea.199601027
A definition of electrolyte presented in an international standard is critically discussed.
Activation of Complexes by Electron-Transfer Processes
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by M. Fátima C. Guedes da Silva
31-43
DOI: DOI: 10.4152/pea.199601031
The electrochemical behaviours of c/s-[ReCI(NCC6H4Me-4)(dppe)2] and of the hydride complex [ReCIH(NCC6H4CI-4)(dppe)2]+ have been studied by cyclic voltammetry (CV) and controlled potential electrolysis (CPE) in aprotic media and at platinum electrodes. The 16-electron dicationic configuration of the former compound undergoes a facile isomerization to its trans isomer in the time scale of CV whereas the hydride complex undergoes an anodically induced deprotonation through an overall bimolecular process. Quantitative analyses of both processes, by digital simulation of cyclic voltammograms, are outlined. The models of Amavadine [VL2]2" [L = "ON(CH(CH3)COO")2 (HIDPA3-) or "ON(CH2COO")2 (HIDA3-)], act as electron-transfer mediators in the electrocatalytic oxidation of thiols. This redox catalysis process is shown to occur through an unprecedented mechanism involving Michaelis-Menten type kinetics.
Diffusion Coefficients of 301 Electrolytes in Aqueous Solutions from Onsager-Fuoss and Pikal Theories
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by V. M. M. Lobo, A.C F. Ribeiro, S. G. C. S. Andrade
45-124
DOI: DOI: 10.4152/pea.199601045
Diffusion coefficients in aqueous electrolyte solutions have been calculated according to Onsager-Fuoss and Pikal theories for over 301 electrolytes in aqueous solutions using the most reliable data.
