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Molecular Aspects of Design, Functioning and Mechanisms of Chemical/Electrochemical Processes of Power Sources

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Physical Chemistry and Chemical Physics".

Deadline for manuscript submissions: closed (10 May 2024) | Viewed by 1260

Special Issue Editors


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Guest Editor
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
Interests: electrochemistry; mechanisms of electrochemical processes; ionic transport in electrochemical systems; electroactive materials: conducting polymers and their composites; energy storage; redox flow batteries; transmembrane transport; ionic liquids; solid electrolytes; structure of electrochemical interfaces; ionic adsorption; kinetics of electron and proton transfer in polar media and at electrochemical interfaces; electric double-layer structure at insulator-solution interface

E-Mail Website
Guest Editor
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
Interests: electrochemical analysis; electroactive materials; energy storage; membrane electrode assembly; redox flow batteries

Special Issue Information

Dear Colleagues,

Progress in the development and applications of novel chemical power sources is induced in the actual period by a rapid increase in requirements towards their characteristics. This advance can only be achieved founded on deep knowledge of the mechanisms of their current-generating reactions as well as of accompanied processes of the mass and heat transport at the “molecular level”, i.e., in terms of elementary interactions between components of the system: reagents, reaction products, and auxiliary species.

This issue is oriented towards the publication of articles devoted to deep analyses of the underlying processes, including mechanisms of coupled electrochemical and/or chemical processes and accompanying physicochemical phenomena in relation to chemical power sources of various types and destinations, description of homogeneous or/and heterogeneous catalytic processes, transmembrane transport of components of electrolyte solutions of both electrodes across the separator, as well as optimization of functional and construction materials of these systems.

Prof. Dr. Mikhail A. Vorotyntsev
Dr. Dmitriy V. Konev
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • chemical power sources

  • electrode materials
  • electrolytes
  • reagents
  • membranes
  • electrochemical reactions
  • ionic transport
  • mechanisms of electrochemical processes
  • homogeneous and heterogeneous catalysis

Published Papers (1 paper)

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Research

25 pages, 5707 KiB  
Article
Evolution of the Bromate Electrolyte Composition in the Course of Its Electroreduction inside a Membrane–Electrode Assembly with a Proton-Exchange Membrane
by Dmitry V. Konev, Pavel A. Zader and Mikhail A. Vorotyntsev
Int. J. Mol. Sci. 2023, 24(20), 15297; https://doi.org/10.3390/ijms242015297 - 18 Oct 2023
Viewed by 693
Abstract
The passage of cathodic current through the acidized aqueous bromate solution (catholyte) leads to a negative shift of the average oxidation degree of Br atoms. It means a distribution of Br-containing species in various oxidation states between −1 and +5, which are mutually [...] Read more.
The passage of cathodic current through the acidized aqueous bromate solution (catholyte) leads to a negative shift of the average oxidation degree of Br atoms. It means a distribution of Br-containing species in various oxidation states between −1 and +5, which are mutually transformed via numerous protonation/deprotonation, chemical, and redox/electrochemical steps. This process is also accompanied by the change in the proton (H+) concentration, both due to the participation of H+ ions in these steps and due to the H+ flux through the cation-exchange membrane separating the cathodic and anodic compartments. Variations of the composition of the catholyte concentrations of all these components has been analyzed for various initial concentrations of sulfuric acid, cA0 (0.015–0.3 M), and two values of the total concentrations of Br atoms inside the system, ctot (0.1 or 1.0 M of Br atoms), as functions of the average Br-atom oxidation degree, x, under the condition of the thermodynamic equilibrium of the above transformations. It is shown that during the exhaustion of the redox capacity of the catholyte (x pass from 5 to −1), the pH value passes through a maximum. Its height and the corresponding average oxidation state of bromine atoms depend on the initial bromate/acid ratio. The constructed algorithm can be used to select the initial acid content in the bromate catholyte, which is optimal from the point of view of preventing the formation of liquid bromine at the maximum content of electroactive compounds. Full article
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