Green synthesis of nickel‐manganese/polyaniline‐based ternary composites for high‐performance supercapattery devices

The study divulges formation of nickel-manganese phosphate and polyaniline (NiMn(PO4)2-PANI)-based ternary composites at different aspect ratios, synthesized via facile sonochemical method. The composite is utilized for high-performance energy storage applications. The composite with 30 wt% PANI depicts the best electrochemical performance with maximum specific capacity (Qs) of 847 C g−1 at 0.5 A g−1 in three-electrode assembly. The supercapattery device is assembled by utilizing NiMn(PO4)2-PANI and activated carbon. The supercapattery demonstrates outstanding performance by delivering a remarkable specific energy of 71.3 Wh kg−1, and the maximum specific power is 12 686 W kg−1 and capacity retention of 97.6% after 5000 GCD series. Furthermore, the diffusive and capacitive mechanism is evaluated by applying Dunn's model. The b values are calculated to confirm the hybrid nature of the device. The study depicts the potentials of reported ternary composites as self-supported electrode materials in the development of cost-effective and efficient energy storage system.