Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes
The self-discharge of an electric double-layer capacitor with composite activated carbon electrodes and aqueous electrolyte (1 M MgSO<sub>4</sub>) was studied in detail. Under a long-term potentiostatic charge (stabilization), a decrease in the discharge capacity was observed in the regi...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-09-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/16/19/6415 |
| _version_ | 1797575635860717568 |
|---|---|
| author | Alexey Yu. Rychagov Valentin E. Sosenkin Marianna Yu. Izmailova Evgeny N. Kabachkov Yury M. Shulga Yury M. Volfkovich Gennady L. Gutsev |
| author_facet | Alexey Yu. Rychagov Valentin E. Sosenkin Marianna Yu. Izmailova Evgeny N. Kabachkov Yury M. Shulga Yury M. Volfkovich Gennady L. Gutsev |
| author_sort | Alexey Yu. Rychagov |
| collection | DOAJ |
| description | The self-discharge of an electric double-layer capacitor with composite activated carbon electrodes and aqueous electrolyte (1 M MgSO<sub>4</sub>) was studied in detail. Under a long-term potentiostatic charge (stabilization), a decrease in the discharge capacity was observed in the region of voltages exceeding 0.8 V. The self-discharge process consists of two phases. In the initial phase, the cell voltage drop is due to the charge redistribution inside electrodes. During the main phase, the charge transfer between the electrodes determines the voltage drop. The optimal stabilization time of the self-discharge was found to be 50 min at 1.4 V. Hydrophilization of the negative electrode occurred during long-term polarization due to the formation of epoxy functional groups. |
| first_indexed | 2024-03-10T21:41:06Z |
| format | Article |
| id | doaj.art-c7fe3b9fa5e747718b5fb4a55ac8ca35 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T21:41:06Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-c7fe3b9fa5e747718b5fb4a55ac8ca352023-11-19T14:39:34ZengMDPI AGMaterials1996-19442023-09-011619641510.3390/ma16196415Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon ElectrodesAlexey Yu. Rychagov0Valentin E. Sosenkin1Marianna Yu. Izmailova2Evgeny N. Kabachkov3Yury M. Shulga4Yury M. Volfkovich5Gennady L. Gutsev6A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Pr. 31, 119071 Moscow, RussiaA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Pr. 31, 119071 Moscow, RussiaA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Pr. 31, 119071 Moscow, RussiaFederal Research Center of Problem of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, 142432 Moscow, RussiaFederal Research Center of Problem of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, 142432 Moscow, RussiaA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Pr. 31, 119071 Moscow, RussiaDepartment of Physics, Florida A&M University, Tallahassee, FL 32307, USAThe self-discharge of an electric double-layer capacitor with composite activated carbon electrodes and aqueous electrolyte (1 M MgSO<sub>4</sub>) was studied in detail. Under a long-term potentiostatic charge (stabilization), a decrease in the discharge capacity was observed in the region of voltages exceeding 0.8 V. The self-discharge process consists of two phases. In the initial phase, the cell voltage drop is due to the charge redistribution inside electrodes. During the main phase, the charge transfer between the electrodes determines the voltage drop. The optimal stabilization time of the self-discharge was found to be 50 min at 1.4 V. Hydrophilization of the negative electrode occurred during long-term polarization due to the formation of epoxy functional groups.https://www.mdpi.com/1996-1944/16/19/6415self-dischargeelectric double-layer supercapacitoractivated carbon electrode |
| spellingShingle | Alexey Yu. Rychagov Valentin E. Sosenkin Marianna Yu. Izmailova Evgeny N. Kabachkov Yury M. Shulga Yury M. Volfkovich Gennady L. Gutsev Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes Materials self-discharge electric double-layer supercapacitor activated carbon electrode |
| title | Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes |
| title_full | Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes |
| title_fullStr | Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes |
| title_full_unstemmed | Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes |
| title_short | Self-Discharge Processes in Symmetrical Supercapacitors with Activated Carbon Electrodes |
| title_sort | self discharge processes in symmetrical supercapacitors with activated carbon electrodes |
| topic | self-discharge electric double-layer supercapacitor activated carbon electrode |
| url | https://www.mdpi.com/1996-1944/16/19/6415 |
| work_keys_str_mv | AT alexeyyurychagov selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes AT valentinesosenkin selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes AT mariannayuizmailova selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes AT evgenynkabachkov selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes AT yurymshulga selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes AT yurymvolfkovich selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes AT gennadylgutsev selfdischargeprocessesinsymmetricalsupercapacitorswithactivatedcarbonelectrodes |