Sinta Marito Siagian, Samaria Chrisna HS, Ferdinan Rinaldo Tampubolon, Suci Khairani, Palma Juanta, Indah Nurhidayati. "Characterization Mass Ratio of TiO2: Coconut Shell  Using FTIR analysis as a Super capacitor." International Journal of Innovative Research in Advanced Engineering (2023). https://doi.org/10.26562/ijirae.2023.v1008.01