Arazi, Ikbal and Putra, Ananda   Preparation and Characterization Composites of Activated Carbon From Cassava Peel (Manihot Utilissima) – Copper (II) Oxide (CuO) as a Thermoelectric Material.  International Journal of Research and Review (IJRR), 7 (9).  pp. 42-51.  ISSN Print: 2349-9788 dan Online: 2454-2237