Carbon nanomaterials derived from Malaysia’s highway road asphalt waste as electrode for supercapacitor

Developing cost-effective and environmental friendly electrode material for supercapacitor is critical for energy storage technologies. the fabrication of asphalt waste carbon (awc) combined with multi-walled carbon nanotube (mwcnt) supercapacitor electrode was performed by using conventional slurry technique. the awc/mwcnt composite electrode was compared to that of non-mixed awc electrode. for non-mixed awc electrode, the specific gravimetric capacitance (csp) was 1.93 f g⁻¹ at 1 mv s⁻¹ scan rate and the csp obtained for awc/mwcnt electrode was 62.94 f g⁻¹. from charge-discharge analysis, the awc/mwcnt electrode showed nearly symmetrical triangular shapes at different current densities (0.5 to 15 a g⁻¹). it was also clear that the csp remains about 80% of the initial capacitance after 800 cycles at 15 a g⁻¹ current density, indicating that awc/mwcnt electrode possessed good ion accessibility and cycling stability.