Construction of dual metal ferrite-based core-shell nanostructures as low-cost multimetal electrode for boosting energy density of flexible asymmetric supercapattery

摘要: Abstract We report the synthesis and fabrication of economically cheaper binder-free hierarchical core-shell nanostructures copper ferrite nanorods nickel nanosheets (CuFe2O4–NR@NiFe2O4–NS) via a two-step wet chemical technique. The unique (nanorods@nanosheets) offer multiple redox couples (Cu2+, Fe3+, Ni2+), smaller ion diffusion path, faster electron movement. When evaluated as an individual electrode in aqueous potassium hydroxide solution, as-synthesized CuFe2O4–NR@NiFe2O4–NS demonstrate superior electrochemical behaviour with concurrent specific capacity 1366 C g−1 at current rate 1 A g−1, 94% retention over 10,000 cycles. flexible asymmetric supercapattery device is assembled comprising positive negative reduced graphene oxide (rGO) PVA-KOH semisolid electrolyte. ASC cell manifest enhanced energy 72 Wh kg−1, power 0.287 kW kg−1 outstanding cycle life (~97% cycles 10 g−1). capacity, retention, excellent cyclic endow such multimetal ferrite-based architecture tremendous potential for use materials fabricating next generation storage devices.