Synthesis and characterization of MnCuO₂ for supercapacitor application

We have synthesized MnCuO₂ material for supercapacitor applications via co-precipitation method. An aqueous solution of the desired amount of manganese chloride and copper chloride was prepared, and an aqueous solution of sodium hydroxide was added drop by drop in this solution, followed by continuous stirring for one hour. The pH of the solution was maintained at 11 using ammonia solution. The resultant precipitation was then washed with DI water and dried overnight, ground, and annealed at 300^oC for 4 hours. The phase purity of the resultant powder was characterized by X-ray diffraction. A slurry of the synthesized MnCuO₂ material was prepared by mixing this material with carbon black and PVDF binder in 80:10:10 (wt% ratio) using N-methyl pyrrolidone as solvent. The slurry was then coated onto pre-cleaned Ni mesh and dried. The resultant electrodes were electrochemically characterized by cyclic voltammetry, charge-discharge, and cycleability using 3 MKOH as electrolyte. The cyclic voltammogram showed the reversible capacitive behavior of MnCuO₂ material. The galvanostatic charge-discharge (GCD) studies were carried out at various current densities between 0.5- 3A/g in a potential window of 0 – 0.4 V. Specific capacitance was found as 373 F/g, 249 F/g, and 150 F/g at a current density of 0.5 A/g, 1 A/g, and 2 A/g, respectively. The detailed results will be presented at APS New England Fall 2025 meeting.