Correlation between silane concentration and temperature operated toward conductivity of well-synthesized chitosan-fly ash composite membrane

Composite membrane is synthesized using well-synthesized chitosan as matrix crosslink with fly ash as filler and modified using 3-glicydyloxypro-pyltrimetoxy silane coupling agent. XRD analysis is carried out to characterize fly ash. While, FTIR characterization is conducted to determine the interaction between chitosan matrix and fly ash that has been modified using silane. The emergence of a new absorption at wave numbers 1118.64 cm-1 shows the inter-action between silane and fly ash. In addition, the widening of OH absorption shows that hydrogen bonds are formed between the silane and chitosan. The interaction is also demonstrated by the evenly distributed hills and valleys on AFM topography analysis. Characterizing the composite membrane with TGA analysis is done to determine thermal stability. While, proton conductivity of the composite membranes are measured using EIS. The highest conductivity values are obtained with the addition of 5 % silane concentration of 2.75x10-4 S cm-1 at room temperature, 3.995x10-4 S cm-1 at 40?C, and 3.909x10-4 S cm-1 at 60?C. On the contrary, measurements at 80?C, decomposition in all composite membranes occur. Thus, the crosslinked composite membrane chitosan - fly ash prepared by silane-crosslinking technique has potential to be applied with polymer electrolyte membrane fuel cell (PEMFC).

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Preparation and Characterization of Nafion-Zirconia Composite Membrane for PEMFC

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.263 ◽

2011 ◽

Vol 239-242 ◽

pp. 263-268 ◽

Cited By ~ 1

Author(s):

Siti Rahmah Mokhtaruddin ◽

Abu Bakar Mohamad ◽

Loh Kee Shyuan ◽

Abdul Amir Hassan Kadhum ◽

Mahreni Akhmad

Keyword(s):

Polymer Electrolyte ◽

Composite Membrane ◽

Polymer Electrolyte Membrane ◽

Composite Membranes ◽

Scanning Calorimetry ◽

Medium Temperature ◽

Electrolyte Membrane ◽

Low Humidity ◽

Ft Ir ◽

Physical And Chemical

Polymer electrolyte membrane based on Nafion and zirconium oxide (ZrO2) was developed via film casting method. The content of ZrO2 (1.0, 2.0, and 3.0 wt.%) was incorporated with Nafion solution to prepare Nafion-ZrO2 composite membranes. Recast Nafion membrane was used as reference material. All of the prepared membranes have been subjected to both physical and chemical characterizations such as Fourier transform infra-red (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) analysis, water uptake rate (WUR) and conductivity measurements. The Nafion-ZrO2 composite membranes were found to possess high thermal stability (Tg= 188 - 192°C) and conductivity (0.30 – 0.93 S cm-1). This study demonstrates the possibility of developing Nafion-ZrO2 composite membrane as promising polymer electrolyte membrane for fuel cell operated at medium temperature and low humidity.

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Fabrication and Characterization of Chitosan/N-Phthaloyl Composite Membrane for DMFC Application

Jurnal Riset Kimia ◽

10.25077/jrk.v12i2.408 ◽

2021 ◽

Vol 12 (2) ◽

Author(s):

Christine Dyta Nugraeni ◽

Lukman Atmaja ◽

Nur Hayati ◽

Mochammad Purwanto ◽

Mardi Santoso ◽

...

Keyword(s):

Proton Conductivity ◽

Composite Membrane ◽

Polymer Electrolyte Membrane ◽

Composite Membranes ◽

Mechanical Analysis ◽

Sem Analysis ◽

Methanol Permeability ◽

Electrolyte Membrane ◽

Modified Chitosan ◽

Chitosan Membrane

Modified chitosan membrane is one of the promising membranes for polymer electrolyte membrane. Chitosan/N-phthaloyl chitosan composite membranes were fabricated to obtain high proton conductivity and low methanol permeability. Membranes were fabricated by casting method and solvent evaporation. Surface morphology, mechanical analysis, methanol permeability, and proton conductivity were used to characterize the overall properties. FT-IR spectra exhibited the presence of interaction of chitosan and n-phthaloyl/chitosan. SEM analysis showed that the surface roughness of composite membrane increases as the n-phthaloyl loading increases. The highest proton conductivity of synthesized membrane is at 2.4 mS.cm-1 and is higher than pristine chitosan membrane at 1.6 mS.cm-1. Moreover, with n-phthaloyl/chitosan addition, the methanol permeability was also improved. The correlation between proton conductivity and methanol permeability in composite membranes suggests that the blend has its potential in DMFC application.

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