Yediya, Hanna (2026) Studi Efek Konsentrasi Metanol Terhadap Kinerja Katalis Fe-NC Berbasis Karbon Pelepah Kelapa Sawit (Elaies Guineesis Jacq.) Pada Reaksi Reduksi Oksigen Menggunakan Metode Rotating Disc Electrode. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Katalis berbasis logam mulia pada reaksi reduksi oksigen (ORR) dari fuel cell memiliki keterbatasan dari segi biaya produksi dan ketahanannya terhadap bahan bakar alkohol, sehingga pengembangan katalis non-logam mulia menjadi penting. Penelitian ini mengkaji pengaruh konsentrasi metanol terhadap kinerja Fe-NC berbasis karbon pelepah sawit pada reaksi reduksi oksigen menggunakan metode Rotating Disc Electrode (RDE). Katalis Fe-NC disintesis melalui proses aktivasi karbon pelepah sawit, polimerisasi anilin, pirolisis, dan pencucian oleh asam, menghasilkan material dengan zeta potential -39,69 mV, luas permukaan BET 614,87 m²/g, serta dominasi ukuran mikropori. Pengujian elektrokimia CV dan LSV pada elektrolit KOH 0,1 M dengan variasi metanol 5%, 10%, 15%, dan 20% menunjukkan onset potensial sebesar -0,12 hingga -0,22 V vs Ag/AgCl, arus katodik maksimum -2,0 × 10⁻⁴ A pada metanol 15%, dan mekanisme ORR campuran 2e⁻ dan 4e⁻ (n=1,92-4,08). Konsentrasi metanol optimal 15% meningkatkan aktivitas ORR melalui peningkatan transfer elektron, sementara konsentrasi di atas 15% menyebabkan saturasi situs aktif dan hambatan difusi. Hasil ini menegaskan potensi katalis biomassa ini sebagai alternatif Pt/C untuk direct methanol fuel cell.
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Noble metal-based catalysts for the oxygen reduction reaction (ORR) have limitations in terms of cost and tolerance to alcohol fuels, making the development of non-noble metal catalysts crucial. This study investigates the effect of methanol concentration on the performance of an Fe-NC catalyst based on palm frond carbon in the oxygen reduction reaction using the Rotating Disc Electrode (RDE) method. The Fe-NC catalyst was synthesized through palm carbon activation, aniline polymerization, pyrolysis, and acid leaching processes, resulting in a material with a zeta potential of -39.69 mV, a BET surface area of 614.87 m²/g, and dominant micropores. Electrochemical testing using CV and LSV in 0.1 M KOH electrolyte with methanol variations of 5%, 10%, 15%, and 20% showed onset potentials of -0.12 to -0.22 V vs Ag/AgCl, a maximum cathodic current of -2.0 × 10⁻⁴ A at 15% methanol, and a mixed 2-electron and 4-electron ORR mechanism (n = 1.92-4.08). The optimal 15% methanol concentration enhances ORR activity through increased electron transfer, while concentrations above 15% cause active site saturation and diffusion limitations. The results affirm the potential of this biomass-derived catalyst as an alternative to Pt/C for alkaline fuel cells.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Fe-NC, Karbon Pelepah Sawit, Reaksi Reduksi Oksigen, DMFC, Fe-NC, palm frond carbon, oxygen reduction reaction, DMFC |
| Subjects: | Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD569 Electrocatalysis. |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Hanna Yediya |
| Date Deposited: | 04 Aug 2026 08:13 |
| Last Modified: | 04 Aug 2026 08:13 |
| URI: | http://repository.its.ac.id/id/eprint/143443 |
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