Alumina’s Effect as Blocking Layer on Self-discharge Process: Case Study of Supercapacitors as Energy storage Devices

Self‐discharge in supercapacitors. PartII: Factors influencing it and mitigation

“…However, the introduction of PPO increased the distance between the electrode and electrolyte ions, leading to a 56% reduction in specific capacitance. In a related study, Salami et al (2019) substituted PPO with a 0.5 nm $$$ {\mathrm{Al}}_2{\mathrm{O}}_3 $$$ layer on the activated carbon electrode. This approach also yielded a remarkable 78% reduction in leakage current and a 45% reduction in specific capacitance.…”

“…Due to the intrinsic complexities of these systems and not‐so‐well‐understood governing physics as seen in Part I, mitigation practices are employed on a trial‐and‐error basis. The measures taken encompass modification of electrode structure (Bu et al, 2020; Devese & Nann, 2020; Ge & Liu, 2019; Liu et al, 2019; Peng et al, 2019; H. Wang, Zhou, et al, 2018; Xia et al, 2018) along with the insertion of polymeric layers on electrode surface (Salami et al, 2019; Tevi et al, 2013), modification (chemical and physical) of the electrolyte (Abbas & Béguin, 2015; Chun et al, 2015; Fan et al, 2020; Fic et al, 2010; Ge & Liu, 2019; Menzel et al, 2020; Su et al, 2021; Y. Z. Wang, Shan, et al, 2019; Xia et al, 2018) and the separator in the cell (Ku et al, 2021; Liang et al, 2022; Peng et al, 2019; C. Zhao, Sun, et al, 2021).…”

“…The measures taken encompass modification of electrode structure (Bu et al, 2020;Devese & Nann, 2020;Ge & Liu, 2019;Liu et al, 2019;Peng et al, 2019;H. Wang, Zhou, et al, 2018;Xia et al, 2018) along with the insertion of polymeric layers on electrode surface (Salami et al, 2019;Tevi et al, 2013), modification (chemical and physical) of the electrolyte (Abbas & Béguin, 2015;Chun et al, 2015;Fan et al, 2020;Fic et al, 2010;Ge & Liu, 2019;Menzel et al, 2020;Su et al, 2021; Y. Z.…”