PUTRA, P. A.; WIDAYANTI. Preparation of Activated Carbon from Coffee Grounds as a Supercapacitor Electrode: Pembuatan Karbon Aktif dari Ampas Kopi sebagai Elektroda Superkapasitor. Sunan Kalijaga Journal of Physics, [S. l.], v. 7, n. 1, p. 1–6, 2025. DOI: 10.14421/physics.v6i2.5155. Disponível em: https://ejournal.uin-suka.ac.id/saintek/physics/article/view/5155. Acesso em: 6 dec. 2025.