Nurjihan, Salsabila (2021) Analisis Pengaruh Variasi Konsentrasi NH4Br Pada Proses Sintesis Katoda MnO2/Carbon Cloth Terhadap Performa Elektrokimia Aqueous Rechargeable Zinc Ion Battery (ARZIB). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Beberapa tahun terakhir, aqueous rechargeable zinc-ion battery (ARZIB) telah menarik cukup banyak perhatian karena keamanannya yang tinggi, dan toksisitas rendah dengan mangan dioksida (MnO2) sebagai material katoda utamanya. MnO2 memiliki berbagai struktur polimorfik yang dapat mempengaruhi kinerja baterai, dimana struktur polimorfik ini dapat dipengaruhi oleh konsentrasi prekursor. Pada penelitian ini digunakan KMnO4 dan NH4Br sebagai prekursor untuk sintesis MnO2/Carbon Cloth dengan variasi konsentrasi NH4Br dalam mengetahui pengaruhnya terhadap struktur polimorfik, morfologi dan performa elektrokimia ARZIB. Konsentrasi NH4Br yang digunakan adalah 0,2 mmol, 0,6 mmol, dan 1 mmol. Proses sintesis menggunakan metode microwave-assisted hydrothermal dengan daya 450-watt selama 25 menit. Hasil penelitian menunjukan bahwa pada konsentrasi NH4Br 0,2 mmol terbentuk polimorf ɛ-MnO2, pada konsentrasi 0,6 mmol terbentuk polimorf α-MnO2, pada konsentrasi 1 mmol terbentuk polimorf β-MnO2. Nilai performa elektrokimia terbaik didapatkan pada sampel dengan konsentrasi NH4Br 0,6 mmol, dengan kapasitas spesifik hingga 104.5 mAh/g dan capacity fading sebesar 22% pada siklus ke 10. Coulombic efficiency pada siklus sepuluh lebih besar dari sampel lain hingga 99.79% membuktikan masa hidup yang baik.
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In recent years, aqueous rechargeable zinc-ion battery (ARZIB) has attracted quite a lot of attention due to its high safety and low toxicity with manganese dioxide (MnO2) as its main cathode material. MnO2 has various polymorphic forms that can affect battery performance, where this polymorphic shape can be influenced by the concentration of precursors. In this study, KMnO4 and NH4Br were used as precursors for the synthesis of MnO2/Carbon Cloth with various concentrations of NH4Br in determining their effect on the polymorphic shape, morphology and electrochemical performance of ARZIB. The concentrations of NH4Br used were 0.2 mmol, 0.6 mmol, and 1 mmol. The synthesis process uses the microwave-assisted hydrothermal method with power of 450 watts for 25 minutes. The results showed that at the concentration of 0.2 mmol NH4Br an ɛ-MnO2 polymorph was formed, at the concentration of 0.6 mmol an α-MnO2 polymorph was formed, and at the concentration of 1 mmol a β-MnO2 polymorph was formed. The best electrochemical performance values were obtained in samples with NH4Br 0.6 mmol, with a specific capacity of up to 104.5 mAh / g and a capacity loss of 22% on the 10th cycle. The coulombic efficiency over ten cycles is greater than that of other samples by up to 99.79% proving a good life span.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | zinc-ion battery, mangan dioksida, katoda, polimorf mangan dioksida |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Salsabila Nurjihan |
| Date Deposited: | 23 Feb 2021 12:37 |
| Last Modified: | 05 Jul 2024 13:26 |
| URI: | http://repository.its.ac.id/id/eprint/82719 |
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