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Electrochemical Characteristics of Zn-Ion Hybrid Supercapacitors Based on Aqueous Solution of Different Electrolytes

Electrochemical behaviour of Zn cation based various aqueous electrolytes (ZnSO 4 , Zn(BF 4 ) 2 , zinc di[bis(trifluoromethylsulfonyl)imide], Zn(TFSI) 2 , and zinc trifluoromethanesulfonate, Zn(OTf) 2 ) has been studied in thin Zn foil∣ carbon cloth hybrid supercapacitor cell and compared with Zn(Cl...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2022-02, Vol.169 (2), p.20512
Main Authors: Eskusson, J., Thomberg, T., Lust, E., Jänes, A.
Format: Article
Language:English
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Summary:Electrochemical behaviour of Zn cation based various aqueous electrolytes (ZnSO 4 , Zn(BF 4 ) 2 , zinc di[bis(trifluoromethylsulfonyl)imide], Zn(TFSI) 2 , and zinc trifluoromethanesulfonate, Zn(OTf) 2 ) has been studied in thin Zn foil∣ carbon cloth hybrid supercapacitor cell and compared with Zn(ClO 4 ) 2 aqueous electrolyte electrochemical characteristics using cyclic voltammetry, constant current charge/discharge and electrochemical impedance methods. The Ragone plots have been calculated from constant power measurements data. At moderate specific power values (10 kW kg −1 ) noticeable decrease of specific energies can be seen in the order of electrolytes: Zn(ClO 4 ) 2 ≥ Zn(BF 4 ) 2 > Zn(OTf) 2 > Zn(TFSI) 2 > ZnSO 4 . The stability of Zn-ion hybrid supercapacitor cells under study has been tested using the long lasting (up to 10000 cycles) constant current charge/discharge method and is very good for Zn(OTf) 2 , Zn(ClO 4 ) 2 and ZnSO 4 .
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac4d68