Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides
A simple and reproducible method of chemical deposition was used to modify carbon nanotubes cobalt and nickel hydroxides. Thus the composites containing 5 and 10 wt.% Co0.5Ni0.5(OH)2(the ratio of hydroxides1:1)were obtained based on the matrix of multiwall carbon nanotubes: non-functionalized (MWCN...
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| Format: | Article |
| Language: | English |
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al-Farabi Kazakh National University
2022-07-01
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| Series: | Eurasian Chemico-Technological Journal |
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| Online Access: | https://ect-journal.kz/index.php/ectj/article/view/1323 |
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| author | E.V. Kachina N.V. Ivanova Yu.A. Zakharov G.Yu. Simenyuk Z.R. Ismagilov M.V. Lomakin |
| author_facet | E.V. Kachina N.V. Ivanova Yu.A. Zakharov G.Yu. Simenyuk Z.R. Ismagilov M.V. Lomakin |
| author_sort | E.V. Kachina |
| collection | DOAJ |
| description |
A simple and reproducible method of chemical deposition was used to modify carbon nanotubes cobalt and nickel hydroxides. Thus the composites containing 5 and 10 wt.% Co0.5Ni0.5(OH)2(the ratio of hydroxides1:1)were obtained based on the matrix of multiwall carbon nanotubes: non-functionalized (MWCNT) and functionalized (MWCNT-f). The physicochemical properties of the obtained nanocomposites were investigated with a focus on the characteristics that are relevant for use as the electrode materials of supercapacitors. Electrical capacity characteristics (specific electrical capacitance, internal resistance, etc.) of nanocomposites were determined using cyclic voltammetry and impedancemetry. The effect of matrix functionalization and filler content on the electrochemical characteristics of the composites was considered. It is established that the surface of carbon nanotubes allows the accumulation of the charge in the electrical double layer, in particular at high polarization rates. At low rates, the contribution from the pseudo-capacity component increases on the filler nanoparticles, on the surface of channels in nanotubes, and pore surface in hydroxide aggregates. An increase in the specific electrical capacitance of the composites by a factor of 1.5 to the capacitance of MWCNTs was achieved. The schemes of electrode processes in the nanocomposite are proposed, and the nature of redox peaks on voltammetric curves providing the occurrence of the pseudo-capacity component is revealed. Relying on the analysis of impedancemetry results, the equivalent series resistance and the charge transfer resistance are evaluated. An equivalent circuit of the cell with the working composite electrode is proposed, and its major parameters are calculated.
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| first_indexed | 2024-04-11T09:07:33Z |
| format | Article |
| id | doaj.art-ba9f49b019084426a80b3107e958de08 |
| institution | Directory Open Access Journal |
| issn | 1562-3920 2522-4867 |
| language | English |
| last_indexed | 2024-04-11T09:07:33Z |
| publishDate | 2022-07-01 |
| publisher | al-Farabi Kazakh National University |
| record_format | Article |
| series | Eurasian Chemico-Technological Journal |
| spelling | doaj.art-ba9f49b019084426a80b3107e958de082022-12-22T04:32:35Zengal-Farabi Kazakh National UniversityEurasian Chemico-Technological Journal1562-39202522-48672022-07-0124210.18321/ectj1323Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel HydroxidesE.V. Kachina0N.V. Ivanova1Yu.A. Zakharov2G.Yu. Simenyuk3Z.R. Ismagilov4M.V. Lomakin5Kemerovo State University, 6 Krasnaya str., Kemerovo, RussiaKemerovo State University, 6 Krasnaya str., Kemerovo, RussiaFederal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, 18 Sovetskiy ave., Kemerovo, RussiaFederal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, 18 Sovetskiy ave., Kemerovo, RussiaFederal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, 18 Sovetskiy ave., Kemerovo, RussiaKemerovo State University, 6 Krasnaya str., Kemerovo, Russia A simple and reproducible method of chemical deposition was used to modify carbon nanotubes cobalt and nickel hydroxides. Thus the composites containing 5 and 10 wt.% Co0.5Ni0.5(OH)2(the ratio of hydroxides1:1)were obtained based on the matrix of multiwall carbon nanotubes: non-functionalized (MWCNT) and functionalized (MWCNT-f). The physicochemical properties of the obtained nanocomposites were investigated with a focus on the characteristics that are relevant for use as the electrode materials of supercapacitors. Electrical capacity characteristics (specific electrical capacitance, internal resistance, etc.) of nanocomposites were determined using cyclic voltammetry and impedancemetry. The effect of matrix functionalization and filler content on the electrochemical characteristics of the composites was considered. It is established that the surface of carbon nanotubes allows the accumulation of the charge in the electrical double layer, in particular at high polarization rates. At low rates, the contribution from the pseudo-capacity component increases on the filler nanoparticles, on the surface of channels in nanotubes, and pore surface in hydroxide aggregates. An increase in the specific electrical capacitance of the composites by a factor of 1.5 to the capacitance of MWCNTs was achieved. The schemes of electrode processes in the nanocomposite are proposed, and the nature of redox peaks on voltammetric curves providing the occurrence of the pseudo-capacity component is revealed. Relying on the analysis of impedancemetry results, the equivalent series resistance and the charge transfer resistance are evaluated. An equivalent circuit of the cell with the working composite electrode is proposed, and its major parameters are calculated. https://ect-journal.kz/index.php/ectj/article/view/1323Cobalt hydroxideNickel hydroxideNanostructured compositeCarbon nanotubesElectrode materialsCyclic voltammetry |
| spellingShingle | E.V. Kachina N.V. Ivanova Yu.A. Zakharov G.Yu. Simenyuk Z.R. Ismagilov M.V. Lomakin Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides Eurasian Chemico-Technological Journal Cobalt hydroxide Nickel hydroxide Nanostructured composite Carbon nanotubes Electrode materials Cyclic voltammetry |
| title | Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides |
| title_full | Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides |
| title_fullStr | Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides |
| title_full_unstemmed | Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides |
| title_short | Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides |
| title_sort | electrochemical properties of the composites based on multiwall carbon nanotubes modified with nanoparticles of mixed cobalt and nickel hydroxides |
| topic | Cobalt hydroxide Nickel hydroxide Nanostructured composite Carbon nanotubes Electrode materials Cyclic voltammetry |
| url | https://ect-journal.kz/index.php/ectj/article/view/1323 |
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