Hadiq, Muhammad Alfin (2026) Analisis Pengaruh Komposisi α-MnO2 dan Temperatur Hidrotermal terhadap Sifat Kapasitif Komposit rGO/α-MnO2/Activated Carbon untuk Aplikasi Superkapasitor Hybrid. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kebutuhan akan sumber energi yang efisien dan ramah lingkungan mendorong pengembangan material elektroda berkinerja tinggi untuk aplikasi superkapasitor. Material MnO₂ merupakan pseudokapasitor dengan kapasitansi teoretis tinggi (~1370 F g⁻¹). Di samping itu, reduced graphene oxide (rGO) memiliki konduktivitas listrik yang baik dengan struktur menyerupai graphene, sedangkan activated carbon (AC) menawarkan luas permukaan yang besar (300–3500 m² g⁻¹). rGO dan AC mengandung gugus fungsi epoksi, hidroksil, karbonil, dan karboksil yang berperan sebagai situs jangkar dalam pembentukan nanostruktur α-MnO₂ secara in situ pada permukaannya. Penelitian ini mempelajari pengaruh variasi komposisi α-MnO₂ dalam komposit rGO/α-MnO₂/AC (rGMA) serta temperatur hidrotermal terhadap sifat struktural dan elektrokimia. Hasil karakterisasi menunjukkan bahwa rGMA memiliki struktur kristal tetragonal, di mana variasi komposisi dan temperatur tidak mengubah struktur kristal, tetapi memengaruhi ukuran kristalit dalam rentang 14.08 – 36.94 nm. Pengujian elektrokimia menunjukkan bahwa rGMA 0.5-180 memiliki kinerja terbaik dengan kapasitansi spesifik sebesar 984.67 F g⁻¹ pada pengujian CV 5 mV s⁻¹, 1278.35 F g⁻¹ pada pengujian EIS, dan 116.33 F g⁻¹ pada pengujian GCD, serta stabilitas siklus yang baik dengan retensi kapasitansi mencapai 99.34%.
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The demand for efficient and environmentally friendly energy sources has driven the development of high-performance electrode materials for supercapacitor applications. MnO₂ is a pseudocapacitive material with a high theoretical capacitance (~1370 F g⁻¹). In addition, reduced graphene oxide (rGO) exhibits good electrical conductivity with a graphene-like structure, while activated carbon (AC) offers a very large surface area (300–3500 m² g⁻¹). Both rGO and AC contain epoxy, hydroxyl, carbonyl, and carboxyl functional groups, which act as anchoring sites for the in situ formation of α-MnO₂ nanostructures on their surfaces. This study investigates the effects of varying α-MnO₂ composition in rGO/α-MnO₂/AC (rGMA) composites and hydrothermal temperature on their structural and electrochemical properties. Characterization results show that rGMA possesses a tetragonal crystal structure, where variations in composition and temperature do not alter the crystal structure but influence the crystallite size, ranging from 14.08 to 36.94 nm. Electrochemical tests demonstrate that rGMA 0.5-180 exhibits the best performance, delivering a specific capacitance of 984.67 F g⁻¹ at 5 mV s⁻¹ (CV test), 1278.35 F g⁻¹ from EIS measurements, and 116.33 F g⁻¹ from GCD tests, along with excellent cycling stability, achieving a capacitance retention of 99.34%.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Hidrotermal, Kapasitansi, Komposisi, Komposit rGO/α-MnO2/AC, Superkapasitor Hybrid, Capacitance, Composition, Hybrid Supercapacitor, Hydrothermal, rGO/α-MnO2/AC Composite |
| Subjects: | Q Science > QC Physics > QC173.4.C63 Composite materials Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD341.H9 Graphene Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 27101-(S2) Master Thesis |
| Depositing User: | Muhammad Alfin Hadiq |
| Date Deposited: | 26 Jan 2026 10:22 |
| Last Modified: | 26 Jan 2026 10:22 |
| URI: | http://repository.its.ac.id/id/eprint/130586 |
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