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A mammoth effort has been levied to alleviate the specific energy of supercapacitors and the asymmetric cell formation that delineates a broader potential window. The α-Fe2O3is a potential candidate for the negative electrode in supercapacitor storage for possessing widespread operating potential, economic, higher redox activity, and eco-friendliness. The significance of the synergistic effects compared on the supercapacitive responses in accordance to the specific energy, specific capacitance, specific power, long cycle stability, and rate capability are emphasized along with the cathodic vanadium oxide PANI CNT composite. The flakes fashioned vanadium dioxide (V2O5) with the assimilation of mw-CNT and polyaniline (PANI) originate by a facile synthesis methodology to antagonize the barrier possessed by vanadium-based oxides in the advancement of supercapacitor. As a result of mw-CNT and PANI integration with V2O5, the established organic-inorganic electrode depicts a higher specific capacitance. Those iron and vanadium oxide composite delineates specific energy of ∼78.72 Wh kg−1and ∼49.31 Wh kg−1, along with retention of the capacitance of ∼91.1% and ∼80.9% each after 10,000 cycles. These inimitable amalgam systems of the combination of inorganic-organic can accomplish the compulsion for the growth of novel functional materials for the applications of energy storage.

The dual metal oxides anticipated prospective substitution of the transition of cathodic energy materials. The prominent attributes like higher specific energy, specific power, and long cycle stability are crucial to a supercapacitor device's energy storage. In this acclaimed research, the novel MnV2O7composite is fabricated by microwave process and tailed by a hydrothermal method where dimethyl formamide, ethylene glycol, and water are used as solvents separately. The bimetallic oxide's distinctive morphology with crystallinity variation realizes by the solvent. It delineates a higher active surface area that grossly supersedes redox-active sites, which eases diffusion of electrolyte ions and multi-valence redox reaction with ions intercalation. The lignocellulosic bio-waste-derived activated carbon materials are worked as anodic material. The synthesized oxide is investigated using diversified characterization tools to confirm the phase formation and investigated by electron microscopy for structural characteristics. The Hirshfeld surface, EPR and theoretical generalized gradient approximations simulation assist in comprehending the electronic interaction to elucidate the experimental consequences. The MnV2O7oxide depicts improved capacitance is 402 Fg−1at 2 mVs−1scan rate and 364 Fg−1at 2 mAcm−2current for dimethyl formamide as solvent compared to rest. Also, composites delineate 96 % long cycle stability up to 10,000 cycles at 40mAcm−2current with a maximum specific energy of 51.8 Whkg−1and specific power of 2500 Wkg−1. The integration of augmented energy storage of the composite leads to a perfect candidate to apprehend the urge of novel advanced materials engineering for applications of energy storage.