首页|High-performance and robust high-temperature polymer electrolyte membranes with moderate microphase separation by implementation of terphenyl-based polymers
High-performance and robust high-temperature polymer electrolyte membranes with moderate microphase separation by implementation of terphenyl-based polymers
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Acid loss and plasticization of phosphoric acid(PA)-doped high-temperature polymer electrolyte mem-branes(HT-PEMs)are critical limitations to their practical application in fuel cells.To overcome these barriers,poly(terphenyl piperidinium)s constructed from the m-and p-isomers of terphenyl were synthe-sized to regulate the microstructure of the membrane.Highly rigid p-terphenyl units prompt the forma-tion of moderate PA aggregates,where the ion-pair interaction between piperidinium and biphosphate is reinforced,leading to a reduction in the plasticizing effect.As a result,there are trade-offs between the proton conductivity,mechanical strength,and PA retention of the membranes with varied m/p-isomer ratios.The designed PA-doped PTP-20m membrane exhibits superior ionic conductivity,good mechanical strength,and excellent PA retention over a wide range of temperature(80-160 ℃)as well as satisfactory resistance to harsh accelerated aging tests.As a result,the membrane presents a desirable combination of performance(1.462 W cm-2 under the H2/O2 condition,which is 1.5 times higher than that of PBI-based membrane)and durability(300 h at 160 ℃ and 0.2 A cm-2)in the fuel cell.The results of this study pro-vide new insights that will guide molecular design from the perspective of microstructure to improve the performance and robustness of HT-PEMs.
Jinyuan Li、Congrong Yang、Haojiang Lin、Jicai Huang、Suli Wang、Gongquan Sun
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Division of Fuel Cells and Battery,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China
Key Laboratory of Fuel Cells & Hybrid Power Sources,Chinese Academy of Sciences,Dalian 116023,Liaoning,China
University of Chinese Academy of Sciences,Beijing 100039,China
National Key Research and Development Program of ChinaNational Natural Science Foundation of China
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