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Published on: November 10, 2014
Tailored charge storage mechanism of a nickel metavanadate/polyaniline composite for high-performance hybrid
Yashika Parlakoti Basappa1, Sharath Kumar Basavaraju2, Amrita Tripathy3
1Energy, Environment and Electrochemistry Lab, Department of Chemistry, NMAM Institute of Technology, Nitte (Deemed to be University), Nitte 574110, Karnataka, India. aartis@nitte.edu.in.
Abstract:
Hybrid materials that integrate battery-type and supercapacitive properties hold significant promise for next-generation energy storage systems. In the present work, a strategically designed nickel metavanadate/polyaniline (NVO/PANI) composite is developed to achieve superior energy storage performance. While the pseudocapacitive nature of NVO promotes surface faradaic reactions, integration with PANI lowers the ion-diffusion resistance to leverage the total charge storage. This synergy has been tailored to deliver a high specific capacitance of 1210 F g-1 at 2 mV s-1, along with excellent cycling stability, retaining 85.7% coulombic efficiency over 3500 cycles. The distinct charge storage mechanisms of NVO and NVO/PANI have been systematically integrated for the first time to develop a battery-type hybrid supercapacitor that exhibits an impressive specific capacitance of 232 F g-1 at 4 A g-1 and a substantial energy density of 22 Wh kg-1 at an elevated power density of 2.82 kW kg-1, retaining 100% coulombic efficiency up to 13 000 cycles. With a capacitance that surpasses commercial standards, the NVO/PANI composite represents a breakthrough in energy storage technology. This remarkable advancement provides a cost-effective and scalable strategy to fabricate high-energy, long-life supercapacitors, holding great potential for practical applications in electric vehicles and grid-scale energy storage.
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