Particle size analysis on density, surface morphology and specific capacitance of carbon electrode from rubber wood sawdust

摘要

The particle size analysis for supercapacitor carbon electrodes from rubber wood sawdust (SGKK) has been done successfully. The electrode particle size was reviewed against the properties such as density, degree of crystallinity, surface morphology and specific capacitance. The variations in particle size were made by different treatment on the grinding and sieving process. The sample particle size was distinguished as 53-100μm for 20 h (SA), 38-53μm for 20 h (SB) and < 38μm with variations of grinding time for 40 h (SC) and 80 h (SD) respectively. All of the samples were activated by 0.4 M KOH solution. Carbon electrodes were carbonized at temperature of 600°C in N2 gas environment and then followed by CO_2 gas activation at a temperature of 900°C for 2 h. The densities for each variation in the particle size were 1.034 g cm~(-3), 0.849 g cm~(-3), 0.892 g cm~(-3) and 0.982 g cm~(-3) respectively. The morphological study identified the distance between the particles more closely at 38-53μm (SB) particle size. The electrochemical properties of supercapacitor cells have been investigated using electrochemical methods such as impedance spectroscopy and charge-discharge at constant current using Solatron 1280 tools. Electrochemical properties testing results have shown SB samples with a particle size of 38-53μm produce supercapacitor cells with optimum capacitive performance.