Modern
wearable technologies require highly efficient energy storage
devices for improving their performance attributing a controlled shape
and flexibility. Here, the present study is focused on the fabrication
of a highly improved V2O5 thin film based supercapacitor.
Symmetric device of V2O5||PVA-KOH||V2O5 was fabricated using thin flexible electrodes prepared
by a thermal evaporation technique. The symmetric supercapacitor devices
were fabricated using both annealed and as-prepared films separately,
and their performance characteristics were compared. The V2O5 symmetric device having pseudocapacitive behavior delivered
a maximum specific areal capacitance of 9.7 mF cm–2 at a scan rate of 10 mV s–1. The symmetric microcapacitor
also showed promising performance even after being bent at 60 and
120°. This indicates the reliability of the fabricated devices
for flexible electronic applications. Moreover, the symmetric capacitor
showed excellent capacitance retention (95%) even after 30 000
cycles with the coulombic efficiency of 99%. Furthermore, practical
feasibility of the as fabricated devices was demonstrated by lighting
blue light-emitting diodes by connecting them in series. On the other
hand, characteristics of the V2O5 thin films
were also studied using X-ray diffraction, Raman spectroscopy, X-ray
photoelectron spectroscopy, field emission scanning electron microscopy,
and atomic force microscopy analysis.
Flexible all solid-state hybrid supercapacitors (HSCs) are considered as significant energy storage devices and used as major power sources in various real-time applications. Herein, we fabricated high crystalline WO3 ||...
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