The present study explores the impact of non-toxic and
higher oxidation
state iron phosphate-blossomed microplatelets [Fe7(PO4)6] anchored on multiwall carbon nanotubes (MWCNTs)
toward supercapacitor applications, which is not only the first report
for the synthesis of Fe7(PO4)6 by
chemical bath deposition but also for the design of symmetric and
asymmetric supercapacitive devices. “Dip and dry” coated
MWCNTs on the copper have been employed as the substrate to fabricate
the Cu/MWCNTs/Fe7(PO4)6 electrode.
Interestingly, the designed Cu/MWCNTs/Fe7(PO4)6 electrode exhibited superior capacitance (727 F/g)
compared to bare MWCNTs (49.8 F/g) and Fe7(PO4)6 (147.8 F/g) at 100 mV/s scan rate. The standalone electrode
has been well optimized through diverse characterizations followed
by the fabrication of a symmetric device in an aqueous KOH electrolyte
yielding 227 F/g specific capacitance, whereas an asymmetric solid-state
device assembled using Cu/MWCNTs/Fe7(PO4)6 and SS/MWCNT electrodes with a conducting KOH electrolyte
embedded in a non-conducting PVA polymer matrix yielding 163 F/g.
Complete studies of symmetric and asymmetric devices have been incorporated
herein.
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