Manufacturing Carbon Material by Carbonization of Cellulosic Palm Oil Waste for Supercapacitor MaterialReza Hendriansyah, Tirto Prakoso, Pramujo Widiatmoko, Isdiriayani Nurdin and Hary DeviantoMATEC Web Conf., 156 (2018) 03018DOI: https://doi.org/10.1051/matecconf/201815603018