Preparation and characterization of a polyvinyl alcohol grafted bis-crown ether anion exchange membrane with high conductivity and strong alkali stability |
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Affiliation: | 1. Center of Excellence for Power Systems Automation and Operation, School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran;2. Department of Electrical and Computer Engineering, Urmia University, Urmia, Iran |
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Abstract: | A new type of symmetrical bis-crown ether is prepared by connecting dibenzo-18-crown-6 ether on both sides of the chromotropic acid, and then grafting the aforementioned bis-crown ether onto polyvinyl alcohol matrix to prepare a series of anion exchange membranes (AEMs), which their have high conductivity and strong alkali stability. These synthesized membranes were named B-CX%-P AEMs (x is the mass percentage of the symmetrical bis-crown ether (B–C)). Then, the chemical structure of aforementioned AEMs were verified by means of 1H NMR, FT-IR and UV. Meanwhile, the OH? conductivity, alkaline stability and single cell performance of the synthesized membrane were also investigated. The results revealed that the conductivity of B–C30%-P membrane is the highest at 80 °C (235 mS cm?1), and the power density is also the highest (197 mW cm?2), and the alkali stability of the membrane synthesized in this paper was also improved. The conductivity at 80 °C was only reduced by 4%, which was obtained by immersing the B–C30%-P membrane immersed in 6 mol L?1 KOH solution for 168 h, which the aforementioned results proved that the synthesized membrane in this research had excellent OH? conductivity and alkaline stability. |
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Keywords: | Fuel cell Bis-crown ether Anion exchange membrane Conductivity Alkaline stability |
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