SINTESIS MEMBRAN KOMPOSIT NANOSILIKA LAPINDO-NAFION d2020 UNTUK FUEL CELL SUHU TINGGI

WINDI SUSMAYANTI, Prof. Dra. Wega Trisunaryanti, MS, PhD. Eng.

2015 | Tesis | S2 Ilmu Kimia

Telah dilakukan sintesis membran komposit nanosilika Lapindo-Nafion d2020 untuk Fuel Cell Suhu Tinggi. Sintesis dan karakterisasi silika dari lumpur Lapindo dengan metode kopresipitasi menggunakan NaOH 6 N dan HCl 3 M kemudian dilanjutkan sintesis dan karakterisasi nanosilika menggunakan NaOH 2,5 N dan H2SO4 3 M. Karakterisasi nanosilika dilakukan menggunakan XRD, FT-IR, TEM. Pembuatan membran komposit dilakukan dengan metode dispersi dan casting menggunakan larutan 5% Nafion d2020 yang ditambahkan nanosilika sebanyak 3% berat dari Nafion d2020. Karakterisasi komposit dilakukan menggunakan XRD, FT-IR, SEM-EDX, TGA dan karakter konduktivitas ion serta swelling terhadap air. Hasil karakterisasi FT-IR dan XRD menunjukkan bahwa silika berhasil disintesis dari lumpur Lapindo. Data TEM memperlihatkan ukuran nanopartikel sebesar 30-100 nm yang menggunakan NaOH 6 M dan HCl 3 M dan 5-16 nm yang menggunakan NaOH 2,5 M dan H2SO4 3 M. Membran komposit nanosilika-Nafion d2020 berhasil dibuat, dibuktikan dari data FT-IR, XRD, TGA, SEM-EDX yang menunjukkan adanya ikatan hidrogen antara nanosilika terhadap Nafion d2020. Konduktivitas proton dan swelling air beserta ketahanan terhadap suhu membran komposit nanosilika-Nafion d2020 yang lebih tinggi dari membran Nafion d2020. Konduktivitas proton membran komposit yang dihasilkan sebesar 6,09 x10-2 S/cm, swelling air 55,274% serta ketahanan operasi fuel cell pada suhu 120ËšC sedangkan konduktivitas proton membran Nafion d2020 5,34 x 10-2 S/cm dengan swelling air 45,15% dan ketahanan operasi fuel cell pada suhu 80ËšC . Kata kunci : Lumpur Lapindo, Nanosilika, Kopresipitasi, Nafion d2020, Komposit

Synthesis of nanosilica Lapindo-Nafion d2020 composite membrane for high temperature Fuel Cell have been investigated. Synthesis of silica from Lapindo Mud through coprecipitation method using NaOH 6 M and HCl 3 M continued with NaOH 2.5 M and H2SO4 3 M. Characterization of silica means of the silica was conducted using XRD, FT-IR, TEM. The composite membrane was prepared by mixing 5% of Nafion d2020 solution and 3 w.t% of nanosilica Nafion d2020 using disperse and casting methods. Characterization results using XRD, FT-IR, SEM-EDX, TGA and character of ionic conductivity and swelling water. Characterization of FT-IR and XRD results showed that the silica was successful synthesized from lapindo mud. The TEM analysis showed that the silica has particle sized of 30-100 nm using NaOH 6 M and HCl 3 M and 5-16 nm using NaOH 2.5 M and H2SO4 3 M. Nanosilica Lapindo-Nafion d2020 composite membrane was successfully produced which confirmed by FT-IR, XRD, TGA, SEM-EDX. The hydrogen bonding was shown on surface of nanosilica and sulfonated groups of Nafion d2020. The proton conductivity, swelling water, and high temperature durability of the composite membranes were higher than those of Nafion d2020 membranes. Proton conductivity of nanosilica Lapindo-Nafion d2020 composite membrane was 6.09 x 10-2 S/cm, swelling water was 55.274 % and high temperature durability on operating system fuel cell was 120ËšC. Proton conductivity of Nafion d2020 membrane was 5.34 x 10-2 S/cm, swelling water was 45.15 % and high temperature durability on operating system fuel cell was 80ËšC. Keywords : Lapindo mud, Nanosilica, Coprecipitation, Nafion d2020, Composite

Kata Kunci : Lumpur Lapindo, Nanosilika, Kopresipitasi, Nafion d2020, Komposit; Lapindo mud, Nanosilica, Coprecipitation, Nafion d2020, Composite