Copper doped cobalt-manganese phosphate ternary composites for high-performance supercapattery devices
By Iqbal, Muhammad Zahir; Khan, Junaid; Gul, Ayesha; Siddique, Saman; Alzaid, Meshal; Saleem, Murtaza; Iqbal, Muhammad Javaid
Published in Journal of Energy Storage
2021
Abstract
This work demonstrates the electrochemical performance of binary as well as ternary metal phosphates synthesized via a cost-effective and facile sonochemical approach. The structural elemental and morphological study of the as-synthesized was investigated via XRD, EDX and SEM. The electrochemical performance of synthesized material was investigated in three and two cell configuration. An outstanding performance was delivered via copper doped cobalt manganese phosphate (Co0.125Cu0.375Mn0.50(PO4)2.) which leads to a specific capacity of 498.2 at 3 mV/s and 483 C/g at 0.5 A/g. This electrode material was utilized as positive electrode material in an asymmetric (supercappatery) device. The activated carbon was employed as a negative electrode material. The fabricated device delivers splendid specific energy of 56 Wh/kg with a specific power of 800 W/kg holds an outstanding specific power of 6420 W/kg while still retaining specific energy of 16.88 Wh/kg. Moreover, the device praises excellent capacity retention of 97.2% after 2000 consective GCD cycles. The supercapattery performance was also analyzed via a simulation approach to investigate the contribution of capacitive and diffusion controlled mechanisms. A maximum capacitive and diffusion contribution of 34.2 (at 60 mV/s) and 86.4% (at 3 mV/s) respectively was observed in aggregate device performance. The morphological and compositional properties along with excellent electrochemical performance make Co0.125Cu0.375Mn0.50(PO4)2 a valuable electrode material for the development of advanced energy storage devices.