Prospect of Hydrogen Technology through Proton Conducting Graphene Oxide Membrane Modified with Organic and Inorganic Filler

Ramadhini, Firtya Kinanti (2025) Prospect of Hydrogen Technology through Proton Conducting Graphene Oxide Membrane Modified with Organic and Inorganic Filler. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Membran berbasis graphene oxide (GO) telah memicu minat yang signifikan dalam permeasi hidrogen. Tujuan dari penelitian ini adalah untuk meningkatkan konduktivitas proton dari membran berbasis GO. Lebih rinci, jarak antar lapisan (d) membran penting karena berfungsi sebagai media untuk proton hopping. Selanjutnya, membran diperlakukan dengan cerium (IV)—sebagai pengisi anorganik—pada berbagai konsentrasi (8 wt%, 12 wt%, dan 16 wt%), serta fibroin sutra (SF)—sebagai pengisi organik. Pengukuran difraksi sinar-X (XRD) menunjukkan bahwa GO-Ce 12 wt% dari jarak d adalah yang paling berkembang, pada 1,22 nm, dibandingkan dengan GO/SF yang hanya mencapai 1,01 nm. Spektroskopi inframerah transformasi Fourier (FTIR) mengungkapkan "pembukaan cincin" antara Ce4+ dan gugus fungsi oksigen (OFG) dari GO. Di sisi lain, SF dikonfirmasi sebagai bagian dalam ikatan hidrogen dengan OFG. Meskipun mendukung ikatan hidrogen, membran ini tidak cocok untuk suhu tinggi karena kemampuannya membentuk struktur β-sheet yang menyebabkan melemahnya ikatan hidrogen dan memperkuat gaya hidrofobik. Pada uji EIS, GO/SF memiliki nilai 6,81 x 10-6 mS/cm, sehingga menjadi tidak stabil saat suhu mencapai 75 dan 100oC. Sebaliknya, GO-Ce 12 wt% merupakan membran paling stabil pada semua suhu karena porositasnya yang tinggi, seperti yang ditentukan oleh karakterisasi AFM dan TGA-DSC. Serium (IV) menghambat pembakaran GO sheet, sedangkan struktur β sheet melemahkan ikatan hidrogen protein-air. Hasilnya, GO-Ce 12 wt% menghasilkan hasil terbesar, dengan fluks permeasi tertinggi yaitu 1,05 x 10-5 mol/m2s.Pa
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Graphene oxide (GO)-based membranes have sparked significant interest in hydrogen permeation. The goal of this research is to increase the proton conductivity of GO-based membranes. More detail, the interlayer spacing (d) of the membranes is important because it serves as a medium for proton hopping. Furthermore, the membranes were treated with cerium (IV)—as inoganic filler—at various concentration (8 wt%, 12 wt%, and 16 wt%), as well as silk fibroin (SF)—as organic filler. X-ray diffraction (XRD) measurements indicated that GO-Ce 12 wt% of d spacing was the most expanded, at 1.22 nm, as opposed to GO/SF which only reached 1.01 nm. Fourier transform infrared spectroscopy (FTIR) revealed the "ring-opening" between Ce4+ and the oxygen functional group (OFG) of GO. On the other hand, SF was confirmed as a part in hydrogen bonding with the OFG. Even though it supported the hydrogen bonding, it was not suitable for high temperatures due to its ability to form β-sheet structure. that led to weaken hydrogen bonding and strengthen the hydrophobic force. On EIS test, GO/SF had a value 6.81 x 10-6 mS/cm, thus became unstable when the temperatures reached up to 75 and 100oC. On the contrary, GO-Ce 12 wt% was the most stable membrane at all temperatures due to its high porosity, as determined by AFM characterization and TGA-DSC. Cerium (IV) inhibited the combustion of GO sheets, while the β sheet structure attenuated the protein-water hydrogen bonds. As a result, GO-Ce 12 wt% produced the greatest results, with the highest permeation flux which was 1.05 x 10-5 mol/m2s.Pa.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	GO, Hydrogen Bonding, Hydrogen Permeation Flux, SF, Proton Conductivity
Subjects:	T Technology > TP Chemical technology > TP159.M4 Membranes (Technology)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Firtya Kinanti Ramadhini
Date Deposited:	27 Jan 2025 10:43
Last Modified:	27 Jan 2025 10:43
URI:	http://repository.its.ac.id/id/eprint/116988

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