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Putra PA, Widayanti. Preparation of Activated Carbon from Coffee Grounds as a Supercapacitor Electrode: Pembuatan Karbon Aktif dari Ampas Kopi sebagai Elektroda Superkapasitor. physics [Internet]. 2025 May 5 [cited 2025 Dec. 6];7(1):1-6. Available from: https://ejournal.uin-suka.ac.id/saintek/physics/article/view/5155