Oxalate-assisted synthesis of MnCo2O4 nanoparticles on layered MXene (Ti3C2Tx) for supercapacitor application

The synthesis of MnCo2O4/Ti3C2Tx composite powders was achieved through a hydrothermal method facilitated by oxalate assistance. To assess the influence of MXene levels (0, 25, and 50 wt%) on microstructure, structure, and electrochemical performance, modern characterization methods were applied in this study. The mixed manganese-cobalt oxalates were precipitated on the layered MXene by adding a proper amount of oxalic acid to the Nitride solution. The MnCo2O4 nanoparticles were then crystallized by heat treatment at 450 degrees C for one hour in a nitrogen gas atmosphere. The pristine MnCo2O4 had a columnar-like morphology, which was transformed into a fine particulate microstructure by combining with MXene. These pristine MnCo2O4 powders indicated a higher specific capacitance of 1116 F g- 1, significantly exceeding the 640.5 Fg- 1 recorded for the pristine layered MXene. The Incorporation of 25 wt% layered MXene enhanced the specific capacitance to a remarkable 1500 Fg- 1, attributed to its finer microstructure. Under a current rate of 1 Ag- 1, the capacitor composed of MnCo2O425 wt% MXene//activated carbon achieved an energy density of 43.5 Wh kg- 1 at a power density of 1411 W kg- 1.