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Int. J. Electroactive Mater. 3 (2015) 33-37

Morphology, Structural and Electrochemical Properties of Porous Chitosan Membrane

Siti Salwa Alias1, Zulkifli Mohamad Ariff1, Ahmad Azmin Mohamad2

1School of Materials and Mineral Resources Engineering , Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia
2School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia

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Abstract : Porous chitosan membrane was prepared by ultrasonic mixing porogen removal and solution-cast method. To remove SiO2 from chitosan membranes, sodium hydroxide solution (30 wt. %) was used to dissolve SiO2. The porous chitosan membrane with weight chitosan–SiO2 ratio 1:2 produced uniform pores membrane morphology and amorphous structure. Physisorption analysis confirmed this membrane was macroporous membrane with surface area (8.2 x 10-1 m2 g-1) and average pore diameter (75.1 nm). After soaking in 5.0 M NH4CH3COO electrolyte solution for 48 hours, the ionic conductivity of membrane increased (3.6 × 10-3 S cm-1) compared with dry membrane (1.0 × 10-7 S cm-1). Cyclic voltammetry analysis showed that the membrane had higher electrochemical potential stability window (3.8 V) compared with dry membrane (3.3 V). These results showed that porous chitosan membrane had good properties and suitable candidate for polymer electrolyte.

Keywords : Porous chitosan membrane,SiO2,Porogen removal,NaOH,NH4CH3COO,