Preparation and Characterization of Novel Poly(2, 6-dimethyl-1, 4-phenylene oxide) Anion-exchange Membranes for Alkaline Fuel Cells

doi:10.7503/cjcu20130371

Abstract

Abstract:

Alkaline anion exchange membrane(AEM) is one of the key materials for anion exchange membrane fuel cells(AEMFC). In this work, starting from poly(2,6-dimethyl-1,4-phenylene oxide)(PPO), the brominated PPO(BrPPO) was synthesized and characterized by FTIR and ¹H NMR spectra. Then an alkaline imidazolium-type resin(PPO-Im) was fabricated via functionalization of BPPO with N-methylimidazole, and the corresponding blending membranes with polyvinylalcohol(PVA) in different content percentages were prepared and characterized by FTIR and ¹H NMR spectra. The SEM images show the prepared membranes are smooth and homogenous. The ion exchange capacity, water uptake, swelling ratio of all prepared membranes were also measured. The ion exchange capacity ranges from 0.47 mmol/g to 1.52 mmol/g. The water uptake is in the range of 50.4%—151.2%. The swelling ratio is in the range of 79.2%—164.2% after being immersed in water at 60℃. The M4 membrane exhibits the highest hydroxide conductivity(49.1 mS/cm at 90℃) by AC-impedance spectroscopy. The tensile strength result shows elongation at break increased to 128%. The thermal gravimetric analyses indicate that the membranes have high thermal stability, which the initial decomposition temperature of imidazolium cation is 170℃, higher than that of quaternary ammonium(120℃). After being immersed in 2 mol/L NaOH for 192 h, the membrane conductivity still keeps their original 81%. All these properties indicate that PPO-Im/PVA membrane is promising for potential applications in alkaline membrane fuel cells.

Key words: Poly(2,6-dimethyl-1,4-phenylene oxide), N-methylimidazole, Blending, Cross-linking, Anion exchange membrane, Fuel cell

CLC Number:

O631.5

TrendMD:

HAN Ke-Fei, YANG Qi-Tao, YU Shu-Ping, YU Jing-Hua, ZHU Hong, WANG Zhong-Ming. Preparation and Characterization of Novel Poly(2, 6-dimethyl-1, 4-phenylene oxide) Anion-exchange Membranes for Alkaline Fuel Cells[J]. Chem. J. Chinese Universities, 2013, 34(10): 2437.

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