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Highly conductive, methanol resistant fuel cell membranes fabricated by layer-by-layer self-assembly of inorganic heteropolyacid |
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| Authors: | Chengji Zhao Haidan Lin Xianfeng Li Wei Xing |
| Affiliation: | a Alan G. MacDiarmid Institute, College of Chemistry, Jilin University, Qianjin Street 2699#, Changchun 130012, Jilin, PR China b Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China c Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China |
| Abstract: | Layer-by-layer (LBL) self-assembly is a simple and elegant method of constructing organic-inorganic composite thin films from environmentally benign aqueous solutions. In this paper, we utilize this method to develop proton-exchange membranes for fuel cells. The multilayer film is constructed onto the surface of sulfonated poly(arylene ether ketone) (SPAEK-COOH) membrane by LBL self-assembly of polycation chitosan (CTS) and negatively charged inorganic particle phosphotungstic acid (PTA). The highly conductive inorganic nanoparticles ensure SPAEK-COOH-(CTS/PTA)n membranes to maintain high proton conductivity values up to 0.086 S cm−1 at 25 °C and 0.24 S cm−1 at 80 °C, which are superior than previous LBL assembled electrolyte systems. These multilayer systems also exhibit extremely low water swelling ratio and methanol permeability. The selectivity of SPAEK-COOH-(CTS/PTA)8 is 2 orders of more than Nafion® 117, which is attractive in direct methanol fuel cells (DMFCs). |
| Keywords: | Sulfonated poly(arylene ether ketone) Proton-exchange membrane Layer-by-layer Chitosan Phosphotungstate |
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