jamtJournal of Advanced Materials and TechnologiesJournal of Advanced Materials and Technologies2782-21922782-2206ФГБОУ ВО «ТГТУ»10.17277/jamt-2026-11-02-139-151jamt-95Research ArticleМатериалы для энергетики и охраны окружающей среды, фотовольтаика следующего поколения и зеленые технологииMaterials for energy and environment, next-generation photovoltaics, and green technologiesСуперконденсаторы на основе малослойных графитовых фрагментов и редокс-активных ферроценсодержащих ионных жидкостейSupercapacitors based on graphene nanoflakes and redox-active ferrocene-containing ionic liquidshttps://orcid.org/0000-0003-1156-2159ЛевинМ. М.LevinM. M.

Левин Михаил Михайлович, техник

ул. Ленинские горы, 1, стр. 3, Москва, 119234

Mikhail M. Levin, Technician

Leninskie gory, Bld. 3, 1, Moscow, 119234

mikhail.levin@chemistry.msu.ruhttps://orcid.org/0000-0002-1710-2041АрхиповаЕ. А.ArkhipovaE. A.

Архипова Екатерина Анатольевна, кандидат химических наук, старший научный сотрудник

ул. Ленинские горы, 1, стр. 3, Москва, 119234

Ekaterina A. Arkhipova, Cand. Sc. (Chem.), Senior Researcher

Leninskie gory, Bld. 3, 1, Moscow, 119234

https://orcid.org/0000-0003-1719-0106ИвановА. С.IvanovA. S.

Иванов Антон Сергеевич, кандидат химических наук, старший научный сотрудник

ул. Ленинские горы, 1, стр. 3, Москва, 119234

Anton S. Ivanov, Cand. Sc. (Chem.), Senior Researcher

Leninskie gory, Bld. 3, 1, Moscow, 119234

https://orcid.org/0000-0002-0672-2683МаслаковК. И.MaslakovK. I.

Маслаков Константин Игоревич, кандидат физико-математических наук, старший научный сотрудник

ул. Ленинские горы, 1, стр. 3, Москва, 119234

Konstantin I. Maslakov, Cand. Sc. (Phys. and Math.), Senior Researcher

Leninskie gory, Bld. 3, 1, Moscow, 119234

https://orcid.org/0000-0002-5827-3912СавиловС. В.SavilovS. V.

Савилов Сергей Вячеславович, доктор химичес­ких наук, доцент, ведущий научный сотрудник

ул. Ленинские горы, 1, стр. 3, Москва, 119234

Serguei V. Savilov, D. Sc. (Chem.), Associate Professor, Leading Researcher

Leninskie gory, Bld. 3, 1, Moscow, 119234

Московский государственный университет им. М. В. Ломоносова, Химический факультетРоссияLomonosov Moscow State University, Faculty of ChemistryRussian Federation202612072026112139151Copyright © Левин М.М., Архипова Е.А., Иванов А.С., Маслаков К.И., Савилов С.В., 20262026Левин М.М., Архипова Е.А., Иванов А.С., Маслаков К.И., Савилов С.В.Levin M.M., Arkhipova E.A., Ivanov A.S., Maslakov K.I., Savilov S.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://jamt.elpub.ru/jour/article/view/95

Ферроценсодержащие ионные жидкости (Fc-ИЖ) (бис(трифторметилсульфонил)имиды N-метил-N-(ферроценилметил)пирролидиния, N-метил-N-(ферроценилметил)пиперидиния и N-этил-N-(ферроценилметил)пирролидиния) испытаны в качестве окислительно-восстановительных добавок для электролитов суперконденсаторов (СК). В качестве электродного материала изучены малослойные графитовые фрагменты (МГФ), в том числе азотзамещённые (N-МГФ). Анализ электрохимических характеристик СК проведен с помощью методов циклической вольтамперометрии, гальваностатического заряда-разряда и спектроскопии электрохимического импеданса. Саморазряд СК измерен при потенциале холостого хода. Показано, что пористые параметры электродного материала, тип и содержание редокс-добавки в электролите определяют удельную ёмкость, плотность энергии, кулоновскую эффективность и величину саморазряда СК. Установлено, что увеличение доли Fc-ИЖ в фоновом электролите 0,5 М [EMIm][NTf2]/ацетонитрил приводит к увеличению удельной емкости электрода на основе МГФ с 85 до 126 Ф/г при скорости развертки потенциала 5 мВ/с за счет дополнительного псевдоемкостного вклада, обусловленного обратимым переносом электронов в ходе редокс-процесса Fe2+/Fe3+, а также способствует росту удельной энергии СК до 21,7 Вт/кг. В отличие от МГФ, легирование азотом оказывает негативное влияние на электрохимические характеристики СК, приводя к ускорению саморазряда вследствие взаимодействия редокс-активных частиц с азотными группами на поверхности электрода.

A series of ferrocene-containing ionic liquids (Fc-ILs) (bis(trifluoromethylsulfonyl)imides ofN-methyl-N-(ferrocenylmethyl)pyrrolidinium, N-methyl-N-(ferrocenylmethyl)piperidinium and N-ethyl-N-(ferrocenylmethyl)pyrrolidinium) were tested as redox-active additives for supercapacitor (SC)ionic liquid electrolytes. Undoped and nitrogen-dopedgraphene nanoflakes (GNFs) were used as an electrode material. The electrochemical characteristics of SCs were analyzed bycyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy. Self-discharge of SCs was measured at open-circuit potential. The specific capacitance, energy density, Coulombic efficiency and self-discharge of the SCs depended on the textural parameters of the electrode material and type and content of the additive to the electrolyte. The increase in the Fc-IL fraction in the 0.5 M [EMIm][NTf2]/acetonitrile supporting electrolyte enhanced the specific capacitance of the GNF-based electrode from 85 to 126 F·g−1 at a scan rate of 5 mV·s−1 due to additional pseudocapacitive contribution from reversible electron transfer in Fe2+/Fe3+. Moreover, the redox-active additives provided the increase in energy density of the SC up to 21.7 Wh·kg−1. Nitrogen doping of GNF accelerated the self-discharge due to the interaction between redox-active species and nitrogen groups on the electrode surface.

суперконденсаторымалослойные графитовые фрагментыредокс-активные электролитыферроценионные жидкостиsupercapacitorsgraphene nanoflakesredox-active electrolytesferroceneionic liquidsИсследование выполнено за счет средств гранта Российского научного фонда № 24-23-00165This study was carried out with the financial support of the Russian Science Foundation (Project No. 24-23-00165).ReferencesQin G, Liu Y, Zhang W, He W, et al. Integrated supercapacitor with self-healing, arbitrary deformability and anti-freezing based on gradient interface structure from electrode to electrolyte. Journal of Colloid and Interface Science. 2023;635:427-440. DOI:10.1016/j.jcis.2022.12.164Qin G, Liu Y, Zhang W, He W, et al. Integrated supercapacitor with self-healing, arbitrary deformability and anti-freezing based on gradient interface structure from electrode to electrolyte. Journal of Colloid and Interface Science. 2023;635:427-440. DOI:10.1016/j.jcis.2022.12.164Hor AA, Yadav N, Hashmi SA. High energy density carbon supercapacitor with ionic liquid-based gel polymer electrolyte: role of redox-additive potassium iodide. Journal of Energy Storage. 2022;47:103608. DOI:10.1016/j.est.2021.103608Hor AA, Yadav N, Hashmi SA. High energy density carbon supercapacitor with ionic liquid-based gel polymer electrolyte: role of redox-additive potassium iodide. Journal of Energy Storage. 2022;47:103608. DOI:10.1016/j.est.2021.103608Arsha MS, Biju V. A 3.5 V supercapacitor with ultrahigh energy and power capabilities using thermally deoxygenated graphite oxide electrodes and water-in-salt electrolyte. Energy & Fuels. 2024;38(19):19076-19087. DOI:10.1021/acs.energyfuels.4c02984Arsha MS, Biju V. A 3.5 V supercapacitor with ultrahigh energy and power capabilities using thermally deoxygenated graphite oxide electrodes and water-in-salt electrolyte. Energy & Fuels. 2024;38(19):19076-19087. DOI:10.1021/acs.energyfuels.4c02984Hao L, Shen L, Wang J, Xu Y, et al. Hollow NiCo2S4 nanotube arrays grown on carbon textile as a self-supported electrode for asymmetric supercapacitors. RSC Advances. 2016;6(12):9950-9957. DOI:10.1039/C5RA24068AHao L, Shen L, Wang J, Xu Y, et al. Hollow NiCo2S4 nanotube arrays grown on carbon textile as a self-supported electrode for asymmetric supercapacitors. RSC Advances. 2016;6(12):9950-9957. DOI:10.1039/C5RA24068AYadav N, Yadav N, Hashmi SA. Ionic liquid incorporated, redox-active blend polymer electrolyte for high energy density quasi-solid-state carbon supercapacitor. Journal of Power Sources. 2020;451:227771. DOI:10.1016/j.jpowsour.2020.227771Yadav N, Yadav N, Hashmi SA. Ionic liquid incorporated, redox-active blend polymer electrolyte for high energy density quasi-solid-state carbon supercapacitor. Journal of Power Sources. 2020;451:227771. DOI:10.1016/j.jpowsour.2020.227771Luo Y, Wang S, Xu Y, Liu N, et al. Exploring redox-active electrolytes to boost energy density of carbon-based supercapacitors. Journal of Colloid and Interface Science. 2025;684:729-734. DOI:10.1016/j.jcis.2025.01.082Luo Y, Wang S, Xu Y, Liu N, et al. Exploring redox-active electrolytes to boost energy density of carbon-based supercapacitors. Journal of Colloid and Interface Science. 2025;684:729-734. DOI:10.1016/j.jcis.2025.01.082Halder J, De P, Chandra A. Synergistic contribution of redox additive electrolytes to significantly increase the performances of hybrid supercapacitors. Journal of Energy Storage. 2024;104:114583. DOI:10.1016/j.est.2024.114583Halder J, De P, Chandra A. Synergistic contribution of redox additive electrolytes to significantly increase the performances of hybrid supercapacitors. Journal of Energy Storage. 2024;104:114583. DOI:10.1016/j.est.2024.114583Arkhipova EA, Ivanov AS, Isaikina OYa, Novotortsev RYu, et al. Application of MnO2/MWCNT composite in supercapacitors. Materials Today: Proceedings. 2022;60:1008-1011. DOI:10.1016/j.matpr 2021.12.408Arkhipova EA, Ivanov AS, Isaikina OYa, Novotortsev RYu, et al. Application of MnO2/MWCNT composite in supercapacitors. Materials Today: Proceedings. 2022;60:1008-1011. DOI:10.1016/j.matpr 2021.12.408Shanmugavani A, Kaviselvi S, Sankar KV, Selvan RK. Enhanced electrochemical performances of PANI using redox additive of K4[Fe(CN)6] in aqueous electrolyte for symmetric supercapacitors. Materials Research Bulletin. 2015;62:161-167. DOI:10.1016/j.materresbull.2014.10.075Shanmugavani A, Kaviselvi S, Sankar KV, Selvan RK. Enhanced electrochemical performances of PANI using redox additive of K4[Fe(CN)6] in aqueous electrolyte for symmetric supercapacitors. Materials Research Bulletin. 2015;62:161-167. DOI:10.1016/j.materresbull.2014.10.075Arkhipova EA, Ivanov AS, Maslakov KI, Savilov SV. Nitrogen-doped mesoporous graphene nanoflakes for high performance ionic liquid supercapacitors. Electrochimica Acta. 2020;353:136463. DOI:10.1016/j.electacta.2020.136463Arkhipova EA, Ivanov AS, Maslakov KI, Savilov SV. Nitrogen-doped mesoporous graphene nanoflakes for high performance ionic liquid supercapacitors. Electrochimica Acta. 2020;353:136463. DOI:10.1016/j.electacta.2020.136463Kumar R, Sahoo S, Joanni E, Singh RK, et al. Heteroatom doped graphene engineering for energy storage and conversion. Materials Today. 2020;39:47-65. DOI:10.1016/j.mattod.2020.04.010Kumar R, Sahoo S, Joanni E, Singh RK, et al. Heteroatom doped graphene engineering for energy storage and conversion. Materials Today. 2020;39:47-65. DOI:10.1016/j.mattod.2020.04.010Śliwak A, Grzyb B, Díez N, Gryglewicz G. Nitrogen-doped reduced graphene oxide as electrode material for high-rate supercapacitors. Applied Surface Science. 2017;399:265-271. DOI:10.1016/j.apsusc.2016.12.060Śliwak A, Grzyb B, Díez N, Gryglewicz G. Nitrogen-doped reduced graphene oxide as electrode material for high-rate supercapacitors. Applied Surface Science. 2017;399:265-271. DOI:10.1016/j.apsusc.2016.12.060Chen Y, Huang J, Zhang X, Xu H. Fabrication of hybrid supercapacitor of RGO//PPyNTs/Co(OH)2 based on K3Fe(CN)6 redox-active electrolyte. Journal of Electroanalytical Chemistry. 2021;884:115069. DOI:10.1016/j.jelechem.2021.115069Chen Y, Huang J, Zhang X, Xu H. Fabrication of hybrid supercapacitor of RGO//PPyNTs/Co(OH)2 based on K3Fe(CN)6 redox-active electrolyte. Journal of Electroanalytical Chemistry. 2021;884:115069. DOI:10.1016/j.jelechem.2021.115069Akhtar MA, Chowdhury A, Chandra A. Addition of redox additives–synergic strategy for enhancing the electrochemical activity of spinel Co3O4 based supercapacitors. Journal of Physics D: Applied Physics. 2019;52(15):155501. DOI:10.1088/1361-6463/ab00d3Akhtar MA, Chowdhury A, Chandra A. Addition of redox additives–synergic strategy for enhancing the electrochemical activity of spinel Co3O4 based supercapacitors. Journal of Physics D: Applied Physics. 2019;52(15):155501. DOI:10.1088/1361-6463/ab00d3Oskin P, Lepikash R, Dyachkova T, Alferov S. Comparative evaluation of different methods for determining the specific surface area of carbon materials used in electrochemical systems. Journal of Advanced Materials and Technologies. 2024;9(3):167-176. DOI:10.17277/jamt.2024.03.pp.167-176Oskin P, Lepikash R, Dyachkova T, Alferov S. Comparative evaluation of different methods for determining the specific surface area of carbon materials used in electrochemical systems. Journal of Advanced Materials and Technologies. 2024;9(3):167-176. DOI:10.17277/jamt.2024.03.pp.167-176Sawant SA, Waikar MR, Chodankar GR, Gurav SR, et al. A redox additive electrolyte boosted supercapacitive energy density of wrinkled RGO sheets. Journal of Energy Storage. 2024;76:109739. DOI:10.1016/j.est.2023.109739Sawant SA, Waikar MR, Chodankar GR, Gurav SR, et al. A redox additive electrolyte boosted supercapacitive energy density of wrinkled RGO sheets. Journal of Energy Storage. 2024;76:109739. DOI:10.1016/j.est.2023.109739Raja TA, Vickraman P. Role of dual redox additives KI/ VOSO4 in manganese ammonium phosphate at graphene quantum dots for supercapattery. International Journal of Energy Research. 2022;46(7):9097-9113. DOI:10.1002/er.7787Raja TA, Vickraman P. Role of dual redox additives KI/ VOSO4 in manganese ammonium phosphate at graphene quantum dots for supercapattery. International Journal of Energy Research. 2022;46(7):9097-9113. DOI:10.1002/er.7787Yang W, Han Q, Li W, Wu M, et al. Suppressed shuttle effect and Self-Discharge of redox electrochemical capacitors using biphasic electrolyte with a Liquid-Liquid interface. Chemical Engineering Journal. 2022;448:137731. DOI:10.1016/j.cej.2022.137731Yang W, Han Q, Li W, Wu M, et al. Suppressed shuttle effect and Self-Discharge of redox electrochemical capacitors using biphasic electrolyte with a Liquid-Liquid interface. Chemical Engineering Journal. 2022;448:137731. DOI:10.1016/j.cej.2022.137731Fic K, Morimoto S, Frąckowiak E, Ishikawa M. Redox activity of bromides in carbon-based electrochemical capacitors. Batteries & Supercaps. 2020;3(10):1080-1090. DOI:10.1002/batt.202000061Fic K, Morimoto S, Frąckowiak E, Ishikawa M. Redox activity of bromides in carbon-based electrochemical capacitors. Batteries & Supercaps. 2020;3(10):1080-1090. DOI:10.1002/batt.202000061Hwang B, Yang J, Kim D, Yun WC, et al. Redox enhanced membraneless electrochemical capacitor with CO2-derived hierarchical porous carbon electrodes. Electrochimica Acta. 2023;442:141871. DOI:10.1016/j.electacta.2023.141871Hwang B, Yang J, Kim D, Yun WC, et al. Redox enhanced membraneless electrochemical capacitor with CO2-derived hierarchical porous carbon electrodes. Electrochimica Acta. 2023;442:141871. DOI:10.1016/j.electacta.2023.141871Liu Y, Dai J, Xiao Y, Wang Y, et al. Novel zinc-ion hybrid supercapacitors with enhanced specific capacity by redox-active ions. Journal of Energy Storage. 2024;77:109834. DOI:10.1016/j.est.2023.109834Liu Y, Dai J, Xiao Y, Wang Y, et al. Novel zinc-ion hybrid supercapacitors with enhanced specific capacity by redox-active ions. Journal of Energy Storage. 2024;77:109834. DOI:10.1016/j.est.2023.109834Huang X, Wang Q, Chen XY, Zhang ZJ. The effects of amine/nitro/hydroxyl groups on the benzene rings of redox additives on the electrochemical performance of carbon-based supercapacitors. Physical Chemistry Chemical Physics. 2016;18(15):10438-10452. DOI:10.1039/C6CP00211KHuang X, Wang Q, Chen XY, Zhang ZJ. The effects of amine/nitro/hydroxyl groups on the benzene rings of redox additives on the electrochemical performance of carbon-based supercapacitors. Physical Chemistry Chemical Physics. 2016;18(15):10438-10452. DOI:10.1039/C6CP00211KManickavasakam K, Suresh Balaji S, Kaipannan S, Karthick Raj AG, et al. Electrochemical performance of Thespesia Populnea seeds derived activated carbon – supercapacitor and its improved specific energy in redox additive electrolytes. Journal of Energy Storage. 2020;32:101939. DOI:10.1016/j.est.2020.101939Manickavasakam K, Suresh Balaji S, Kaipannan S, Karthick Raj AG, et al. Electrochemical performance of Thespesia Populnea seeds derived activated carbon – supercapacitor and its improved specific energy in redox additive electrolytes. Journal of Energy Storage. 2020;32:101939. DOI:10.1016/j.est.2020.101939Gebremariam GK, Jovanović AZ, Pašti IA. The effect of electrolytes on the kinetics of the hydrogen evolution reaction. Hydrogen. 2023;4(4):776-806. DOI:10.3390/hydrogen4040049Gebremariam GK, Jovanović AZ, Pašti IA. The effect of electrolytes on the kinetics of the hydrogen evolution reaction. Hydrogen. 2023;4(4):776-806. DOI:10.3390/hydrogen4040049Warrington A, O’Dell LA, Hutt OE, Forsyth M, et al. Structure and interactions of novel ether-functionalised morpholinium and piperidinium ionic liquids with lithium salts. Energy Advances. 2023;2(4):530-546. DOI:10.1039/D2YA00348AWarrington A, O’Dell LA, Hutt OE, Forsyth M, et al. Structure and interactions of novel ether-functionalised morpholinium and piperidinium ionic liquids with lithium salts. Energy Advances. 2023;2(4):530-546. DOI:10.1039/D2YA00348AOng SP, Andreussi O, Wu Y, Marzari N, et al. Electrochemical windows of room-temperature ionic liquids from molecular dynamics and density functional theory calculations. Chemistry of Materials. 2011;23(11):2979-2986. DOI:10.1021/cm200679yOng SP, Andreussi O, Wu Y, Marzari N, et al. Electrochemical windows of room-temperature ionic liquids from molecular dynamics and density functional theory calculations. Chemistry of Materials. 2011;23(11):2979-2986. DOI:10.1021/cm200679yTu QM, Fan LQ, Pan F, Huang JL, et al. Design of a novel redox-active gel polymer electrolyte with a dual-role ionic liquid for flexible supercapacitors. Electrochimica Acta. 2018;268:562-568. DOI:10.1016/j.electacta.2018.02.008Tu QM, Fan LQ, Pan F, Huang JL, et al. Design of a novel redox-active gel polymer electrolyte with a dual-role ionic liquid for flexible supercapacitors. Electrochimica Acta. 2018;268:562-568. DOI:10.1016/j.electacta.2018.02.008Fan LQ, Tu QM, Geng CL, Huang JL, et al. High energy density and low self-discharge of a quasi-solid-state supercapacitor with carbon nanotubes incorporated redox-active ionic liquid-based gel polymer electrolyte. Electrochimica Acta. 2020;331:135425. DOI:10.1016/j.electacta.2019.135425Fan LQ, Tu QM, Geng CL, Huang JL, et al. High energy density and low self-discharge of a quasi-solid-state supercapacitor with carbon nanotubes incorporated redox-active ionic liquid-based gel polymer electrolyte. Electrochimica Acta. 2020;331:135425. DOI:10.1016/j.electacta.2019.135425Lee KS, Jeong HT. Development and optimization of ionic liquid-based gel polymer electrolyte for all solid-state supercapacitor. Journal of Energy Storage. 2021;42:103001. DOI:10.1016/j.est.2021.103001Lee KS, Jeong HT. Development and optimization of ionic liquid-based gel polymer electrolyte for all solid-state supercapacitor. Journal of Energy Storage. 2021;42:103001. DOI:10.1016/j.est.2021.103001Geng CL, Fan LQ, Wang CY, Wang YL, et al. High energy density and high working voltage of a quasi-solid-state supercapacitor with a redox-active ionic liquid added gel polymer electrolyte. New Journal of Chemistry. 2019;43(47):18935-18942. DOI:10.1039/C9NJ04769GGeng CL, Fan LQ, Wang CY, Wang YL, et al. High energy density and high working voltage of a quasi-solid-state supercapacitor with a redox-active ionic liquid added gel polymer electrolyte. New Journal of Chemistry. 2019;43(47):18935-18942. DOI:10.1039/C9NJ04769GBenjamin M, Manoj D, Karnan M, et al. Switching the solubility of electroactive ionic liquids for designing high energy supercapacitor and low potential biosensor. Journal of Colloid and Interface Science. 2021;588:221-231. DOI:10.1016/j.jcis.2020.12.033Benjamin M, Manoj D, Karnan M, et al. Switching the solubility of electroactive ionic liquids for designing high energy supercapacitor and low potential biosensor. Journal of Colloid and Interface Science. 2021;588:221-231. DOI:10.1016/j.jcis.2020.12.033Xie HJ, Gélinas B, Rochefort D. Redox-active electrolyte supercapacitors using electroactive ionic liquids. Electrochemistry Communications. 2016;66:42-45. DOI:10.1016/j.elecom.2016.02.019Xie HJ, Gélinas B, Rochefort D. Redox-active electrolyte supercapacitors using electroactive ionic liquids. Electrochemistry Communications. 2016;66:42-45. DOI:10.1016/j.elecom.2016.02.019Borchers PS, Gerlach P, Liu Y, Hager MD, et al. The influence of the nature of redox-active moieties on the properties of redox-active ionic liquids and on their use as electrolyte for supercapacitors. Energies. 2021;14(19):6344. DOI:10.3390/en14196344Borchers PS, Gerlach P, Liu Y, Hager MD, et al. The influence of the nature of redox-active moieties on the properties of redox-active ionic liquids and on their use as electrolyte for supercapacitors. Energies. 2021;14(19):6344. DOI:10.3390/en14196344Gélinas B, Forgie JC, Rochefort D. Conductivity and electrochemistry of ferrocenyl-imidazolium redox ionic liquids with different alkyl chain lengths. Journal of The Electrochemical Society. 2014;161(4):H161-H165. DOI:10.1149/2.017404jesGélinas B, Forgie JC, Rochefort D. Conductivity and electrochemistry of ferrocenyl-imidazolium redox ionic liquids with different alkyl chain lengths. Journal of The Electrochemical Society. 2014;161(4):H161-H165. DOI:10.1149/2.017404jesArkhipova EA, Levin MM, Ivanov AS, Zakharov MA, et al. Electroactive ferrocene-based ionic liquids: transport and electrochemical properties of their acetonitrile solutions. Electrochimica Acta. 2025;512:145443. DOI:10.1016/j.electacta.2024.145443Arkhipova EA, Levin MM, Ivanov AS, Zakharov MA, et al. Electroactive ferrocene-based ionic liquids: transport and electrochemical properties of their acetonitrile solutions. Electrochimica Acta. 2025;512:145443. DOI:10.1016/j.electacta.2024.145443Arkhipova EA, Ivanov AS, Maslakov KI, Egorov AV, et al. Mesoporous graphene nanoflakes for high performance supercapacitors with ionic liquid electrolyte. Microporous and Mesoporous Materials. 2020;294:109851. DOI:10.1016/j.micromeso.2019.109851Arkhipova EA, Ivanov AS, Maslakov KI, Egorov AV, et al. Mesoporous graphene nanoflakes for high performance supercapacitors with ionic liquid electrolyte. Microporous and Mesoporous Materials. 2020;294:109851. DOI:10.1016/j.micromeso.2019.109851Savilov SV, Arkhipova EA, Ivanov AS, Maslakov KI, et al. Pyrolytic synthesis and characterization of N-doped carbon nanoflakes for electrochemical applications. Materials Research Bulletin. 2015;69:7-12. DOI:10.1016/j.materresbull.2014.12.057Savilov SV, Arkhipova EA, Ivanov AS, Maslakov KI, et al. Pyrolytic synthesis and characterization of N-doped carbon nanoflakes for electrochemical applications. Materials Research Bulletin. 2015;69:7-12. DOI:10.1016/j.materresbull.2014.12.057Klein JM, Panichi E, Gurkan B. Potential dependent capacitance of [EMIM][TFSI], [N1114][TFSI] and [PYR13][TFSI] ionic liquids on glassy carbon. Physical Chemistry Chemical Physics. 2019;21(7):3712-3720. DOI:10.1039/C8CP04631JKlein JM, Panichi E, Gurkan B. Potential dependent capacitance of [EMIM][TFSI], [N1114][TFSI] and [PYR13][TFSI] ionic liquids on glassy carbon. Physical Chemistry Chemical Physics. 2019;21(7):3712-3720. DOI:10.1039/C8CP04631JChoudhury BJ, Muigai HH, Kalita P, Moholkar VS. Biomass blend derived porous carbon for aqueous supercapacitors with commercial-level mass loadings and enhanced energy density in redox-active electrolyte. Applied Surface Science. 2022;601:154202. DOI:10.1016/j.apsusc.2022.154202Choudhury BJ, Muigai HH, Kalita P, Moholkar VS. Biomass blend derived porous carbon for aqueous supercapacitors with commercial-level mass loadings and enhanced energy density in redox-active electrolyte. Applied Surface Science. 2022;601:154202. DOI:10.1016/j.apsusc.2022.154202Ghosh K, Srivastava SK. Enhanced supercapacitor performance and electromagnetic interference shielding effectiveness of CuS quantum dots grown on reduced graphene oxide sheets. ACS Omega. 2021;6(7):4582-4596. DOI:10.1021/acsomega.0c05034Ghosh K, Srivastava SK. Enhanced supercapacitor performance and electromagnetic interference shielding effectiveness of CuS quantum dots grown on reduced graphene oxide sheets. ACS Omega. 2021;6(7):4582-4596. DOI:10.1021/acsomega.0c05034Duraisamy N, Arshid N, Kandiah K, Iqbal J, et al. Development of asymmetric device using Co3(PO4)2 as a positive electrode for energy storage application. Journal of Materials Science: Materials in Electronics. 2019;30(8):7435-7446. DOI:10.1007/s10854-019-01057-xDuraisamy N, Arshid N, Kandiah K, Iqbal J, et al. Development of asymmetric device using Co3(PO4)2 as a positive electrode for energy storage application. Journal of Materials Science: Materials in Electronics. 2019;30(8):7435-7446. DOI:10.1007/s10854-019-01057-xZhou D, Wang H, Mao N, Chen Y, et al. High energy supercapacitors based on interconnected porous carbon nanosheets with ionic liquid electrolyte. Microporous and Mesoporous Materials. 2017;241:202-209. DOI:10.1016/j.micromeso.2017.01.001Zhou D, Wang H, Mao N, Chen Y, et al. High energy supercapacitors based on interconnected porous carbon nanosheets with ionic liquid electrolyte. Microporous and Mesoporous Materials. 2017;241:202-209. DOI:10.1016/j.micromeso.2017.01.001Lee J, Srimuk P, Fleischmann S, Su X, et al. Redox-electrolytes for non-flow electrochemical energy storage: a critical review and best practice. Progress in Materials Science. 2019;101:46-89. DOI:10.1016/j.pmatsci.2018.10.005Lee J, Srimuk P, Fleischmann S, Su X, et al. Redox-electrolytes for non-flow electrochemical energy storage: a critical review and best practice. Progress in Materials Science. 2019;101:46-89. DOI:10.1016/j.pmatsci.2018.10.005Bodin C, Sekhar Bongur C, Deschanels M, Catrouillet S, et al. Shuttle effect quantification for redox ionic liquid electrolyte correlated to the coulombic efficiency of supercapacitors. Batteries & Supercaps. 2020;3(11):1193-1200. DOI:10.1002/batt.202000084Bodin C, Sekhar Bongur C, Deschanels M, Catrouillet S, et al. Shuttle effect quantification for redox ionic liquid electrolyte correlated to the coulombic efficiency of supercapacitors. Batteries & Supercaps. 2020;3(11):1193-1200. DOI:10.1002/batt.202000084Shang W, Yu W, Xiao X, Ma Y, et al. Insight into the self-discharge suppression of electrochemical capacitors: progress and challenges. Advanced Powder Materials. 2023;2(1):100075. DOI:10.1016/j.apmate.2022.100075Shang W, Yu W, Xiao X, Ma Y, et al. Insight into the self-discharge suppression of electrochemical capacitors: progress and challenges. Advanced Powder Materials. 2023;2(1):100075. DOI:10.1016/j.apmate.2022.100075Chen H, Zhang Y, Yang H, Jia B, et al. Self-discharge of redox electrolyte enhanced supercapacitors based on nanosheet-like CoS2. Chemical Engineering Journal. 2024;494:152910. DOI:10.1016/j.cej.2024.152910Chen H, Zhang Y, Yang H, Jia B, et al. Self-discharge of redox electrolyte enhanced supercapacitors based on nanosheet-like CoS2. Chemical Engineering Journal. 2024;494:152910. DOI:10.1016/j.cej.2024.152910Volfkovich YuM. Self-discharge of supercapacitors: a review. Russian Journal of Electrochemistry. 2023;59(1):24-36. DOI:10.1134/S1023193523010123Volfkovich YuM. Self-discharge of supercapacitors: a review. Russian Journal of Electrochemistry. 2023;59(1):24-36. DOI:10.1134/S1023193523010123Zhao H, Zhang H, Wang Z, Jiang X, et al. Chain-Elongated ionic liquid electrolytes for low self-discharge all-solid-state supercapacitors at high temperature. ChemSusChem. 2021;14(18):3895-3903. DOI:10.1002/cssc.202101294Zhao H, Zhang H, Wang Z, Jiang X, et al. Chain-Elongated ionic liquid electrolytes for low self-discharge all-solid-state supercapacitors at high temperature. ChemSusChem. 2021;14(18):3895-3903. DOI:10.1002/cssc.202101294

The authors declare that there are no conflicts of interest present.