Preparation And Characterization Of Porous Chitosan Membrane Soaked In Ammonium Acetate Electrolyte For Proton Batteries

• Main Author: Alias, Siti Salwa
• Format: Thesis
• Language: English
• Published: 2016
• Subjects: T Technology; TA401-492 Materials of engineering and construction. Mechanics of materials
• Online Access: http://eprints.usm.my/41774/1/Preparation_And_Characterization_Of_Porous_Chitosan_Membrane_Soaked_In_Ammonium_Acetate_Electrolyte_For_Proton_Batteries.pdf; http://eprints.usm.my/41774/

Membran berliang mendapat banyak perhatian untuk aplikasi bateri kerana keupayaan untuk mengekalkan elektrolit dalam membran. Kesan nisbah berat kitosan:SiO2 dalam penyediaan membran kitosan berliang telah dikaji dalam kajian ini. Membran kitosan berliang disediakan melalui gabungan ultrasonik dan pengacuan larutan diikuti kaedah fasa balikan dengan nisbah berat SiO2 penyingkir porogen 0.4-4.0. Membran kitosan berliang dengan nisbah berat kitosan-SiO2 1:2.0 (PC5) menghasilkan saiz liang optimum 8.5 ± 0.4 μm dengan struktur amorfus, penyerapan air tertinggi 146.4 ± 7.3%, interaksi kimia, kestabilan haba dan sifat tegangan yang baik. Proses rendaman lanjutan membran dalam 5.0 M larutan elektrolit NH4CH3COO selama 48 jam (PC5-5A48H) menghasilkan kekonduksian tertinggi (4.5 ± 1.7) × 10-3, penyerapan elektrolit tertinggi 308.6 ± 15.4%, tenaga pengaktifan terendah 0.04 ± 0.002 eV, voltan pecahan optimum 1.8 V, interaksi kimia, morfologi, struktur amorfus, kestabilan haba dan sifat tegangan yang baik. Fabrikasi sel syiling bateri proton menggunakan PC5-5A48H menunjukkan voltan litar terbuka 1.5 V selama 7 hari, ketumpatan kuasa maksimum 6.7 mW cm-2 dan rintangan dalaman yang kecil 0.03 Ω. Kapasiti nyahcas tertentu yang diperolehi dari profil nyahcas meningkat (23.4, 41.0 44.6 and 47.7 mA h g-1) berkadar terus dengan arus nyahcas (0.1, 0.5, 1.0 and 5.0 mA). Voltan keluaran eksperimen dan simulasi dua sel syiling bateri proton yang digabungkan secara sesiri dengan diod pemancar cahaya warna hijau adalah antara 2.0-2.6 V. ________________________________________________________________________________________________________________________ Porous membrane received much attention for batteries application due to the ability to retain electrolyte inside membrane. The effects of chitosan:SiO2 weight ratio in preparation of porous chitosan-SiO2 membranes were investigated in this study. Porous chitosan membranes were prepared via ultrasonic mix solution-cast and phase inversion method using different SiO2 porogen removal weight ratio from 0.4-4.0. Porous chitosan membrane with chitosan:SiO2 weight ratio 1:2.0 (PC5) produced optimum pores with size of 8.5 ± 0.4 μm, as well as with an amorphous structure, the highest water uptake of (146.4 ± 7.3) %, good chemical interaction, thermal stability and tensile properties. Further soaking this membrane in 5.0 M NH4CH3COO electrolyte solution for 48 hours (PC5-5A48H) produced the highest conductivity ((4.5 ± 1.7) × 10-3), highest electrolyte uptake (308.6 ± 15.4 %), lowest activation energy (0.04 ± 0.002 eV), optimum breakdown voltage (1.8 V), good chemical interaction, morphology, amorphicity, thermal stability and tensile properties. Fabrication of coin cell proton battery using PC5-5A48H displayed an open circuit potential of 1.5 V for 7 days, maximum power density (6.7 mW cm-2), and small current resistance (0.03 Ω). Specific discharge capacities were obtained from discharge profile increment (23.4, 41.0, 44.6, and 47.7 mA h g-1) as the discharge currents increased (0.1, 0.5, 1.0, and 5.0 mA). The output voltage of experimental and simulation of the two coin cell proton batteries combined in series connected with green light emitting diode was between 2.0-2.6 V.