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Maximized Energy Density of RuO 2 //RuO 2 Supercapacitors through Potential Dependence of Specific Capacitance
Author(s) -
Wang Yilun,
Gu Dawei,
Guo Jiaren,
Xu Mingyang,
Sun Hongshun,
Li Jishu,
Wang Lei,
Shen Linjiang
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901898
Subject(s) - capacitance , ruthenium oxide , supercapacitor , oxide , electrode , cyclic voltammetry , materials science , analytical chemistry (journal) , graphene , voltage , mass ratio , chemistry , condensed matter physics , electrochemistry , nanotechnology , electrical engineering , physics , metallurgy , engineering , chromatography , astrophysics
In this study, a stepwise cyclic voltammetry approach was proposed to clarify the potential dependence of specific capacitance for reduced graphene oxide and ruthenium oxide electrodes. Based on the relationship between specific capacitance and potential, the working voltage window and energy density of RuO 2 //RuO 2 supercapacitors (SCs) were maximized by modulating the mass ratio. The working voltage window of RuO 2 //RuO 2 with a mass ratio of 2.03 (close to optimum mass ratiom + / m - O P T M = 2 . 04 ) was extended by about 188 % when compared to that calculated at a mass ratio of 0.56. The former was equivalent to a 304 % increase in energy density. In addition, the source of wasted potential window of electrodes on RuO 2 //RuO 2 was investigated in an effort to design and produce better SCs.