(358e) Carbon Mixed Spinel Ferrites As Electrode Material for Asymmetric Supercapacitor

Spinel ferrite materials (AFe₂O₄, whereas A is the transition metal, such as Co, Cu, Zn, and Mn) have attracted research interest due to their chemical stability and multiple practical applications in organics removal, thermochemical water/CO₂ splitting, resonant circuits, wideband transformers, and energy storage. Spinel ferrite materials are useful as electrode materials in asymmetric supercapacitor (ASC) that are characterized with dissimilar electrode materials. These materials can enhance electrochemical potential and electrical conductivity. Spinel ferrite is typically used in conjunction with porous carbon (POC), as POC has higher thermal stability and numerous sites for adsorption and desired porosity for ionic transport. In this investigation, hydrothermal liquefaction (HTL)-derived hydrochar from lignocellulosic biomass (LCB) was chemically activated and thermally treated to produce POC with high specific surface area (SSA) and porosity. Ni-ferrite (NiFe₂O₄) was synthesized by the sol-gel method based on the stoichiometry ratio of Ni and Fe precursor salts. Composite electrodes of NiFe₂O_4/POC were prepared and used in ASC configuration for electrochemical testing. These electrode materials were characterized by powdered X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analyzer and Fourier transform infrared (FTIR). Electrochemical performance such as specific capacitance, cyclic stability and electrochemical impedance of the ASCs fabricated using composite NiFe₂O_4/POC electrode will be presented.