Supercapacitors
have emerged as one of the most promising candidates
for high-performance, safe, clean, and economical routes to store
and release of nonfossil energy. Designing hybrid materials by integrating
double-layer and pseudocapacitive materials is crucial to achieving
high-power and high-energy storage devices simultaneously. Herein,
we synthesized a polyoxomolybdate–polypyrrole–graphene
oxide nanohybrid via a one-pot reaction. The inclusion of polypyrrole
enables a uniform distribution of the polyoxomolybdate clusters; it
also confines the restacking of graphene oxide nanosheets. The structural
and morphological analysis to unveil the nanohybrid architecture implies
excellent interfacial contact, enabling fast redox reaction of polyanions,
and a quick transfer of charge to the interfaces. Electrochemical
characteristics tested under a two-electrode system exhibit the highest
capacitance of 354 F g–1 with significantly high
specific energy and power of 49.16 Wh kg–1 and 999.86
W kg–1, respectively. In addition, the cell possesses
a high-rate capability and long cycle life by maintaining 96% of its
capacitance over 5000 sweeping cycles. The highest specific power
of ∼10 000 W kg–1 was computed with
Coulombic efficiency of 92.30% at 5 A g–1 current
density. Electrochemical impedance spectroscopy additionally reveals
enhanced redox charge transfer due to double hybridization. Furthermore,
it also demonstrates the impedance and capacitive behavior of supercapacitor
cells over a definite frequency regime.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.