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Comparative Study of Individual and Mixed Aqueous Electrolytes with ZnFe 2 O 4 Nano–flakes Thin Film as an Electrode for Supercapacitor Application
Author(s) -
Vadiyar Madagonda M.,
Bhise Sagar C.,
Patil Sandip K.,
Kolekar Sanjay S.,
Chang JiaYaw,
Ghule Anil V.
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600151
Subject(s) - electrolyte , materials science , capacitance , supercapacitor , chemical engineering , electrode , ionic conductivity , aqueous solution , conductivity , electrochemistry , analytical chemistry (journal) , chemistry , chromatography , engineering
In the present work, ZnFe 2 O 4 nano‐flakes thin films are grown on stainless steel substrate using mechanochemical approach. The prepared thin films are characterized and used as working electrodes for supercapacitor application. Investigation for an ideal electrolyte is systematically carried out by comparing three aqueous electrolytes such as LiOH, NaOH, KOH (1 M) and their binary mixtures (1:1 v/v of 1 M each electrolyte) on the basis of their supercapacitive performances. Among the electrolytes, 1 M KOH is found to be an ideal electrolyte, which demonstrates higher specific capacitance (433 F g −1 ), cycle stability (91 % retention up to 4000 cycles), energy density (86 Wh kg −1 ), respectively. The binary mixtures of LiOH‐NaOH, NaOH‐KOH and LiOH‐KOH electrolytes show relatively less specific capacitance of 106, 146 and 180 F g −1 , respectively. The use of mixed electrolytes and underlying factors affecting the performance are investigated in detail for the first time. The physical parameters such as conductivity, density, viscosity, contact angle and hydrated ionic radius of aqueous electrolytes influencing the specific capacitance of the ZnFe 2 O 4 nano‐flakes based electrode is studied.