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Low-cost flexible supercapacitors with high-energy density based on
nanostructured MnO2 and Fe2O3 thin films directly fabricated onto stainless
steel
#MMPMID26208144
Gund GS
; Dubal DP
; Chodankar NR
; Cho JY
; Gomez-Romero P
; Park C
; Lokhande CD
Sci Rep
2015[Jul]; 5
(?): 12454
PMID26208144
show ga
The facile and economical electrochemical and successive ionic layer adsorption
and reaction (SILAR) methods have been employed in order to prepare manganese
oxide (MnO2) and iron oxide (Fe2O3) thin films, respectively with the fine
optimized nanostructures on highly flexible stainless steel sheet. The symmetric
and asymmetric flexible-solid-state supercapacitors (FSS-SCs) of nanostructured
(nanosheets for MnO2 and nanoparticles for Fe2O3) electrodes with
Na2SO4/Carboxymethyl cellulose (CMC) gel as a separator and electrolyte were
assembled. MnO2 as positive and negative electrodes were used to fabricate
symmetric SC, while the asymmetric SC was assembled by employing MnO2 as positive
and Fe2O3 as negative electrode. Furthermore, the electrochemical features of
symmetric and asymmetric SCs are systematically investigated. The results verify
that the fabricated symmetric and asymmetric FSS-SCs present excellent
reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and
good cycling stability (83 and 91%, respectively for 3000 of CV cycles).
Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg(-1),
about 2-fold of higher energy density (41.8 Wh kg(-1)) than symmetric SC and
excellent mechanical flexibility. Furthermore, the "real-life" demonstration of
fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher
energy density compare to symmetric SC.
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