Doable high energy density supercapacitors using rice husk-derived carbon in dihydroxybenzenes as redox-additive electrolytes

被引:5
作者
Soundarya, D. [1 ]
Sandhiya, M. [2 ,3 ]
Sampathkumar, P. [1 ,3 ]
Suresh, C. [1 ,3 ]
Sathish, M. [2 ,3 ]
Mathiyarasu, J. [1 ,3 ]
机构
[1] Cent Electrochem Res Inst, Electrod & Electrocatalysis Div, CSIR, Karaikkudi 630003, Tamil Nadu, India
[2] Cent Electrochem Res Inst, Electrochem Power Sources Div, CSIR, Karaikkudi 630003, Tamil Nadu, India
[3] Acad Sci & Innovat Res AcSIR, Ghaziabad 201002, India
关键词
One-step activation; Activated carbon; Supercapacitor; Redox-additives; Enhanced specific capacitance; High energy density; ACTIVATED CARBON; POROUS CARBON; PERFORMANCE; CAPACITANCE; STORAGE; SURFACE; GROWTH; ROBUST;
D O I
10.1016/j.est.2023.109407
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Though activated carbon made from various bio wastes is quite affordable and plentiful, the energy density of these electrodes in aqueous electrolytes is still questionable. Therefore, increasing the energy density of activated carbon for use in supercapacitors is a challenging issue. The ideal way to boost the energy density of supercapacitors in aqueous electrolytes is by using redox-additive electrolytes. Redox-additive electrolytes are the impeccable solution for thriving the energy density of supercapacitors in aqueous electrolytes. Here, three additives namely 1, 2-benzene diol, 1, 3-benzene diol, and 1, 4-benzene diol were utilized as redox-additives with 1 M H2SO4 to study the influence of the position of -OH on their redox activity and electrochemical performance. The activated carbon derived from rice-husk delivered a high specific capacitance of 1414 F/g at 4 A/g with 1, 4benzene diol/H2SO4 among the three redox additives. A symmetric supercapacitor was fabricated, which exhibited a remarkable energy density of 38 Wh/kg at 2 A/g with 1, 4-benzene diol/H2SO4, which is almost 4 times superior to the energy density of the same electrode with H2SO4 (10.6 Wh/kg at 2 A/g).
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页数:12
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