Testing of Electrical Properties and Synthesis of MnO2-Graphene Composites from Leaching Results of Manganese Rocks

This study aims to synthesize and test the electrical properties of the MnO2-graphene composite from the leaching of manganese rock. The test method is carried out by testing the electrical properties with the parameters, namely capacitance (C), current (I), voltage (V), resistance (R), and conductometer. Each tested three concentration variations, 0.25: 0.75, 0.5: 0.05, and 0.75: 0.5. Supporting parameters for testing use X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR). The results showed that the effect of varying the mass ratio of the MnO2-Graphene composite on the capacitance value was 192.3ꙡF in the variation of 0.25 gr: 0.75, meaning that the higher the concentration of the graphene carbon ratio, the higher the absorption capacity to store charge and electrical energy. For the variation of the voltage obtained by 353 mV at 0.25 gr: 0.75 variations, the current testing variation obtained a value of 13.6 mA at 0.25 gr: 0.75 variations, the variation on resistance obtained the lowest resistance value of 1.6 kΩ in the 0.25 gr variation: 0.75. The X-Ray Diffraction (XRD) test produces α manganese and graphene ranging from 6.8% to 93.2%. The Fourier Transform Infrared (FTIR) test produces Mn-O, CO, and OH bonds. Mn-O with wave numbers 479.44 cm-1, 1.618.35 cm-1, 1.877.47 cm-1, and 992.07 cm-1. CO with wave numbers 1104.27 cm-1, 1190.69 cm-1, and 1384.21 cm-1. OH with wave numbers 1438.44 cm-1 and 1627.70 cm-1 electrical storage medium.