Sintesis dan Karakterisasi Membran Komposit PMMA–RM257 dengan Filler Silika Tersulfonasi untuk Proton Exchange Membrane Fuel Cell (PEMFC)

FADHILA SHOFI ALBANA, . (2026) Sintesis dan Karakterisasi Membran Komposit PMMA–RM257 dengan Filler Silika Tersulfonasi untuk Proton Exchange Membrane Fuel Cell (PEMFC). Sarjana thesis, Universitas Negeri Jakarta.

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Abstract

Pengembangan membran elektrolit dengan konduktivitas ion tinggi dan stabilitas termal baik menjadi salah satu fokus pengembangan Proton Exchange Membrane Fuel Cell (PEMFC). Penelitian ini bertujuan menganalisis pengaruh penambahan filler SiO₂ tersulfonasi terhadap karakteristik, kemampuan penyerapan air, serta sifat elektrokimia membran komposit PMMA–RM257. Membran disintesis menggunakan metode UV curing dengan variasi konsentrasi filler 3%, 5%, 10%, dan 15%. Karakterisasi dilakukan menggunakan FTIR, SEM, XRD, dan Polarized Optical Microscopy (POM), sedangkan sifat membran dievaluasi melalui uji swelling, Electrochemical Impedance Spectroscopy (EIS), dan pengukuran konduktivitas ionik menggunakan LCR meter. Hasil FTIR menunjukkan keberhasilan penambahan SiO₂ tersulfonasi yang ditandai dengan munculnya gugus Si–O–Si, Si–OH, dan –SO₃H tanpa mengubah struktur dasar PMMA–RM257. Hasil XRD menunjukkan seluruh membran tetap didominasi struktur amorf dengan nilai FWHM 0,639–0,640 dan d-spacing sekitar 12,62–12,66 Å, sedangkan POM memperlihatkan membran didominasi sifat anisotropik. SEM menunjukkan dispersi filler semakin homogen hingga konsentrasi 10%, kemudian terjadi aglomerasi pada konsentrasi 15%. Nilai swelling berubah dari 2,20% (kontrol), meningkat pada penambahan 3% dan 5%, mencapai kondisi optimum sebesar 1,35% (10%), dan meningkat menjadi 4,86% (15%). Hasil EIS menunjukkan resistivitas menurun dari 5,27 × 10⁷ Ω·m (kontrol) menjadi 7,83 × 10⁴ Ω·m (10%), namun masih rendah dibandingkan nafion 117 (6,65 × 10² Ω·m). Hasil pengukuran LCR meter menunjukkan konduktivitas ionik meningkat secara bertahap dari membran kontrol hingga mencapai nilai tertinggi sebesar 6,50 × 10⁻⁵ S/cm pada penambahan filler 10%, kemudian menurun pada konsentrasi 15%. Membran PMMA–RM257 dengan filler SiO₂ tersulfonasi 10% berpotensi sebagai membran elektrolit untuk aplikasi PEMFC. Kata Kunci: Membran Komposit, PEMFC, PMMA, RM257, Silika Tersulfonasi. *** The development of electrolyte membranes with high ionic conductivity and good thermal stability is one of the key focuses in the development of Proton Exchange Membrane Fuel Cells (PEMFCs). This study aims to analyze the effect of adding sulfonated SiO₂ filler on the characteristics, water absorption capacity, and electrochemical properties of PMMA–RM257 composite membranes. The membranes were synthesized using the UV curing method with filler concentrations of 3%, 5%, 10%, and 15%. Characterization was performed using FTIR, SEM, XRD, and Polarized Optical Microscopy (POM), while the membrane properties were evaluated through swelling tests, Electrochemical Impedance Spectroscopy (EIS), and ionic conductivity measurements using an LCR meter. The FTIR results indicate the successful incorporation of sulfonated SiO₂, as evidenced by the appearance of Si–O–Si, Si–OH, and –SO₃H groups without altering the basic structure of PMMA–RM257. The XRD results showed that all membranes remained dominated by an amorphous structure with FWHM values of 0.639–0.640 and d-spacing of approximately 12.62–12.66 Å, while POM exhibited membranes dominated by anisotropic properties. SEM analysis revealed that filler dispersion became increasingly homogeneous up to a concentration of 10%, after which agglomeration occurred at a concentration of 15%. The swelling value changed from 2.20% (control), increased with the addition of 3% and 5%, reached an optimum of 1.35% (10%), and increased to 4.86% (15%). The EIS results showed that the resistivity decreased from 5.27 × 10⁷ Ω·m (control) to 7.83 × 10⁴ Ω·m (10%), but it was still lower than that of Nafion 117 (6.65 × 10² Ω·m). The LCR meter measurements showed that ionic conductivity increased gradually from the control membrane, reaching a peak value of 6.50 × 10⁻⁵ S/cm at a 10% filler addition, and then decreased at a 15% concentration. The PMMA–RM257 membrane with 10% sulfonated SiO₂ filler shows potential as an electrolyte membrane for PEMFC applications. Keywords: Composite Membrane, PEMFC, PMMA, RM257, Sulfonated Silica.

Item Type:	Thesis (Sarjana)
Additional Information:	1). Dr. Afrizal, M.Si. 2). Yussi Pratiwi, M.Sc.
Subjects:	Sains > Kimia
Divisions:	FMIPA > S1 Kimia
Depositing User:	Fadhila Shofi Albana .
Date Deposited:	06 Aug 2026 06:19
Last Modified:	06 Aug 2026 06:19
URI:	http://repository.unj.ac.id/id/eprint/68737

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