ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ

ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ

Recently, preparation of carbon materials by molten salt electrolysis has been demonstrated as a promising way of carbon capture, utilization and storage. This paper discusses the results of studies on the mechanism of carbon electrodeposition reactions in molten carbonate salts, especially voltamme...

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Datum:2021
Hauptverfasser: Novoselova, Inessa, Kuleshov, Serhii, Omelchuk, Anatoliy, Bykov, Valerii, Fesenko, Olena
Format: Artikel
Sprache:English
Veröffentlicht: V.I.Vernadsky Institute of General and Inorganic Chemistry 2021
Online Zugang:https://ucj.org.ua/index.php/journal/article/view/322
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Назва журналу:Ukrainian Chemistry Journal

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Ukrainian Chemistry Journal
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spelling oai:ojs2.1444248.nisspano.web.hosting-test.net:article-3222021-08-26T08:45:46Z PECULIARITIES OF ELECTROREDUCTION OF Li2CO3 IN THE EQUIMOLAR MELT OF SODIUM AND POTASSIUM CHLORIDES ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ Novoselova, Inessa Kuleshov, Serhii Omelchuk, Anatoliy Bykov, Valerii Fesenko, Olena lithium carbonate, electroreduction, molten salts, carbon nanomaterials. Recently, preparation of carbon materials by molten salt electrolysis has been demonstrated as a promising way of carbon capture, utilization and storage. This paper discusses the results of studies on the mechanism of carbon electrodeposition reactions in molten carbonate salts, especially voltammetric investigations. A CV study of the electroreduction of Li2CO3 against the background electrolyte NaCl–KCl was carried out. It was found that the electroreduction of Li2CO3 to carbon occurs through the stage of a preliminary chemical reaction of acid-base type with forming of electrochemically active particles – CO2 and LixCO32-x at potentials of -0.8 and -1.7 V (against Pb|PbCl2 reference electrode), respectively. Both processes are irreversible, and the electroreduction of LixCO32-x takes place with diffusion control of the delivery of the depolarizer to the electrode surface. Electrolysis of melts have been carried out under potentiostatic conditions in an air atmo­sphere at different potentials (E = -1.0 and -1.8 V) at the temperature 750°C. The product yield was 40–60%. Compositions, morphological and structural peculiarities of carbon pro­ducts have been studied by XRD analyses, SEM and Raman spectroscopy. XRD study shows that a symmetrical halo occurs at 2θ ~21 and 43°, suggesting that obtained carbon materials are amorphous. The ratio of the intensities of D and G bands (ID/IG) on Raman spectra was > 1 that indicates the extent of defects and impurities in the electrolytic carbon or the pre­sence of ultrathin carbon. Agglomerated particles consist of degraded graphite structures with an approximate crystallite size of 30–40 nm. Their general appearance resembles the model of "crumpled paper". The electroreduction of Li2CO3 to carbon in molten salts presented in this study is environmentally benign and affordable, providing a promising route for the production carbon nanomaterials. Also, this work highlights the possibility of using Li2CO3 as a precursor of high-temperature electrochemical synthesis of various carbonaceous materials, in particular, tungsten carbides. V.I.Vernadsky Institute of General and Inorganic Chemistry 2021-07-26 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/322 10.33609/2708-129X.87.06.2021.70-81 Ukrainian Chemistry Journal; Vol. 87 No. 6 (2021): Ukrainian Chemistry Journal; 70-81 Украинский химический журнал; Том 87 № 6 (2021): Ukrainian Chemistry Journal; 70-81 Український хімічний журнал; Том 87 № 6 (2021): Український хімічний журнал; 70-81 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/322/173
institution Ukrainian Chemistry Journal
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datestamp_date 2021-08-26T08:45:46Z
collection OJS
language English
topic_facet lithium carbonate
electroreduction
molten salts
carbon nanomaterials.
format Article
author Novoselova, Inessa
Kuleshov, Serhii
Omelchuk, Anatoliy
Bykov, Valerii
Fesenko, Olena
spellingShingle Novoselova, Inessa
Kuleshov, Serhii
Omelchuk, Anatoliy
Bykov, Valerii
Fesenko, Olena
ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ
author_facet Novoselova, Inessa
Kuleshov, Serhii
Omelchuk, Anatoliy
Bykov, Valerii
Fesenko, Olena
author_sort Novoselova, Inessa
title ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ
title_short ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ
title_full ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ
title_fullStr ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ
title_full_unstemmed ОСОБЛИВОСТІ ЕЛЕКТРОВІДНОВЛЕННЯ Li2CO3 В ЕКВІМОЛЯРНОМУ РОЗПЛАВІ ХЛОРИДІВ НАТРІЮ ТА КАЛІЮ
title_sort особливості електровідновлення li2co3 в еквімолярному розплаві хлоридів натрію та калію
title_alt PECULIARITIES OF ELECTROREDUCTION OF Li2CO3 IN THE EQUIMOLAR MELT OF SODIUM AND POTASSIUM CHLORIDES
description Recently, preparation of carbon materials by molten salt electrolysis has been demonstrated as a promising way of carbon capture, utilization and storage. This paper discusses the results of studies on the mechanism of carbon electrodeposition reactions in molten carbonate salts, especially voltammetric investigations. A CV study of the electroreduction of Li2CO3 against the background electrolyte NaCl–KCl was carried out. It was found that the electroreduction of Li2CO3 to carbon occurs through the stage of a preliminary chemical reaction of acid-base type with forming of electrochemically active particles – CO2 and LixCO32-x at potentials of -0.8 and -1.7 V (against Pb|PbCl2 reference electrode), respectively. Both processes are irreversible, and the electroreduction of LixCO32-x takes place with diffusion control of the delivery of the depolarizer to the electrode surface. Electrolysis of melts have been carried out under potentiostatic conditions in an air atmo­sphere at different potentials (E = -1.0 and -1.8 V) at the temperature 750°C. The product yield was 40–60%. Compositions, morphological and structural peculiarities of carbon pro­ducts have been studied by XRD analyses, SEM and Raman spectroscopy. XRD study shows that a symmetrical halo occurs at 2θ ~21 and 43°, suggesting that obtained carbon materials are amorphous. The ratio of the intensities of D and G bands (ID/IG) on Raman spectra was > 1 that indicates the extent of defects and impurities in the electrolytic carbon or the pre­sence of ultrathin carbon. Agglomerated particles consist of degraded graphite structures with an approximate crystallite size of 30–40 nm. Their general appearance resembles the model of "crumpled paper". The electroreduction of Li2CO3 to carbon in molten salts presented in this study is environmentally benign and affordable, providing a promising route for the production carbon nanomaterials. Also, this work highlights the possibility of using Li2CO3 as a precursor of high-temperature electrochemical synthesis of various carbonaceous materials, in particular, tungsten carbides.
publisher V.I.Vernadsky Institute of General and Inorganic Chemistry
publishDate 2021
url https://ucj.org.ua/index.php/journal/article/view/322
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first_indexed 2025-09-24T17:43:39Z
last_indexed 2025-09-24T17:43:39Z
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