Investigating the Redox Behavior of CNT-Enhanced Cr₃O₄/Ni-MOF for Next-Generation Supercapattery Applications

Asymmetric supercapacitors are devices that combines the advantages of batteries and supercapacitors. In this work, hydrothermal method is used to synthesize the chromium (III) oxide composite with nickel metal organic framework in a 50/50 wt% ratio. Then 10% carbon nanotube is also induced into the hetrostructure of Cr₃O₄/Ni-MOF to enhance the electrical conductivity. The CNT@Cr₃O₄/Ni-MOF composite demonstrated a specific capacity of 1537 C/g at 1.0 A/g in a three-electrode system. CNT@Cr₃O₄/Ni-MOF and activated carbon (AC) are use in an asymmetric device configuration. Remarkably, the device CNT@Cr₃O₄/Ni-MOF//AC displayed a specific capacity of 279 C/g at 1.0 A/g. Furthermore, the CNT@Cr₃O₄/Ni-MOF//AC showed a remarkable power density of 1220 Wk/g and energy density of 73.47 Whk/g. After 15,000 cycles, CNT@Cr₃O₄/Ni-MOF//AC retained almost 98% capacity retention. These performance highlights the potential of CNT@Cr₃O₄/Ni-MOF electrode in future energy storage devices.