Abstract
Rational design of a unique hybrid derived from transition-metal oxides, possessing high capacity but poor electronic conductivity, with two-dimensional (2D) MXenes, owning metallic conductivity but limited capacity and instability in aqueous electrolytes, is expected to produce innovative electrode materials for supercapacitor. In this study, we fabricated a free-standing triphasic composite film of NiFe2O4 pillared Ti3C2Tx encapsulated with polypyrrole (MNFx@PPy). This composite combined merits from large redox capacity of NiFe2O4 and high conductivity of Ti3C2Tx to operate within a voltage window of 1.2 V in 2.0 M H2SO4 electrolyte. The MNF10@PPy electrode had a specific capacity of 706.6 mAh·g−1 at 1.0 A·g−1, with 81.13 % retention at a high current density of 20 A·g−1. The integration of PPy enhanced interfacial contact of the components which leads to upsurge in electrochemical performance and stability of the tri-component system. When the fabricated asymmetric flexible supercapacitor (MXene@PPy//MNF10@PPy) was assessed with broad 1.6 V, a complimentary potential window of both electrodes, the device offered 37.49 Wh·kg−1 energy density at a power density of 3879 W·kg−1. This study underscores the synergetic potential of the MNF10@PPy composite to improve energy storage pseudocapacitive electrodes for flexible devices.
Published Version
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