Maulidin, Ahmad Rafli (2025) Studi Pengaruh Konsentrasi Reduktor dan Waktu Reduksi pada Sintesis Katalis Pt/Fe-N-C Berbasis Metode Sonochemistry terhadap Struktur Material dan Sifat Elektrokimia Untuk Proton Exchange Membrane Fuel Cell. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Performa Proton Exchange Membrane Fuel Cell (PEMFC) sangat ditentukan oleh struktur material serta sifat elektrokimia katalis Pt/C. Namun, katalis Pt/C berbasis karbon hitam yang tersedia secara komersial memiliki kelemahan utama terkait stabilitas pada siklus tinggi akibat degradasi material selama proses oksidasi. Pada penelitian ini bertujuan untuk menganalisis pengaruh modifikasi karbon melalui High-Temperature Graphitization dengan doping Fe dan Nitrogen serta menganalisis pengaruh waktu reduksi (sonifikasi) dan konsentrasi reduktor (asam format) dalam proses sintesis katalis Pt/Fe-N-C terhadap struktur material, sifat elektrokimia, serta performa pada pengaplikasian PEMFC. Prekursor platinum yang digunakan adalah H2PtCl6.6H2O serta karbon yang dihasilkan dari pencampuran melamin sebagai prekursor karbon dan nitrogen dan FeCl3.6H2O. Pada penelitian ini, dilakukan pengujian karakterisasi material (XRD, FTIR, SEM-EDX-Elemental Mapping), pengujian elektrokimia (CV, LSV), dan pengujian performa (single cell). Melalui pengujian karakterisasi, diketahui bahwa proses modifikasi karbon mempengaruhi struktur dengan adanya Fe, Nitrogen, dan graphitic karbon, geometri yang dominan berbentuk Nitrogen-doped Graphene Tubes (NGTs) dengan ukuran 121-474 nm, ikatan karbon-nitrogen yang secara langsung meningkatkan sifat elektrokimia, stabilitas, dan performa PEMFC. Kemudian melalui pengujian karakterisasi XRD, diketahui bahwa proses sintesis katalis Pt/Fe-N-C menghasilkan Pt dengan indeks miller Pt(111), Pt(200), Pt(220), Pt(311), dan Pt(222), kemudian variasi waktu dan konsentrasi reduktor yang digunakan berpengaruh terhadap ukuran kristalit platinum. Melalui pengujian CV diketahui bahwa variasi waktu ataupun konsentrasi reduktor meningkatkan nilai ECSA dan performa elektrokimia yang dievaluasi melalui LSV, serta performa PEMFC juga terus meningkat seiring dengan peningkatan variasi. Variasi terbaik didapatkan pada Pt/Fe-N-C dengan waktu reduksi selama 360 menit dan konsentrasi reduktor (asam format) sebesar 5M dengan nilai ECSA sebesar 67.56 mgpt/cm2, number of electron 4.07, dan power density sebesar 267.36 mW/cm2, nilai degradasi sebesar 26.3% yang lebih baik dibandingkan Pt/C komersial.
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The performance of Proton Exchange Membrane Fuel Cell (PEMFC) is highly determined by the material structure and electrochemical properties of the Pt/C catalyst. However, commercially available carbon black-based Pt/C catalysts have major weaknesses related to stability at high cycles due to material degradation during the oxidation process. This study aims to analyze the effect of carbon modification through High-Temperature Graphitization with Fe and Nitrogen doping and to analyze the effect of reduction time (sonification) and reductant concentration (formic acid) in the Pt/Fe-N-C catalyst synthesis process on the material structure, electrochemical properties, and performance in PEMFC applications. The platinum precursor used is H2PtCl6.6H2O and carbon produced from mixing melamine as a carbon and nitrogen precursor and FeCl3.6H2O. In this study, material characterization tests (XRD, FTIR, SEM-EDX-Elemental Mapping), electrochemical tests (CV, LSV), and performance tests (single cell) were carried out. Through characterization testing, it is known that the carbon modification process affects the structure with the presence of Fe, Nitrogen, and graphitic carbon, the dominant geometry is in the form of Nitrogen-doped Graphene Tubes (NGTs) with a size of 121-474 nm, carbon-nitrogen bonds that directly improve the electrochemical properties, stability, and performance of PEMFC. Then through XRD characterization testing, it is known that the synthesis process of the Pt/Fe-N-C catalyst produces Pt with miller indices Pt(111), Pt(200), Pt(220), Pt(311), and Pt(222), then variations in time and concentration of the reductant used affect the size of the platinum crystallite. Through CV testing it is known that variations in time or concentration of the reductant increase the ECSA value and electrochemical performance evaluated through LSV, and PEMFC performance also continues to increase along with increasing variations. The best variation was obtained in Pt/Fe-N-C with a reduction time of 360 minutes and a reducing agent concentration (formic acid) of 5M with an ECSA value of 67.56 mgpt/cm2, an electron count of 4.07, and a power density of 267.36 mW/cm2, a degradation value of 26.3% which is better than commercial Pt/C.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Asam Format, Katalis Pt/Fe-N-C, Konsentrasi, PEMFC, Sonochemistry, Waktu Reduksi Concentration, Formic Acid, PEMFC,Pt/Fe-N-C Catalyst, Reduction Time, Sonochemistry |
| Subjects: | Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD569 Electrocatalysis. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2931 Fuel cells |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Ahmad Rafli Maulidin |
| Date Deposited: | 30 Jul 2025 01:03 |
| Last Modified: | 30 Jul 2025 01:03 |
| URI: | http://repository.its.ac.id/id/eprint/123066 |
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