Gel Electrolytes of Covalent Network Polybenzimidazole and Phosphoric Acid by Direct Casting
Andreas Kirkebæk
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
Search for more papers by this authorCorresponding Author
David Aili
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
E-mail: [email protected]Search for more papers by this authorDirk Henkensmeier
Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), 39-1, Hwarangno 14gil5, Seongbukgu, 02792 Seoul, Republic of Korea
ET-GT, University of Science and Technology, Seoul, 02792 Republic of Korea
Green School, Korea University, Anam-ro 145, Seongbukgu, Seoul, 02841 Republic of Korea
Search for more papers by this authorJens Oluf Jensen
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
Search for more papers by this authorQingfeng Li
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
Search for more papers by this authorAndreas Kirkebæk
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
Search for more papers by this authorCorresponding Author
David Aili
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
E-mail: [email protected]Search for more papers by this authorDirk Henkensmeier
Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), 39-1, Hwarangno 14gil5, Seongbukgu, 02792 Seoul, Republic of Korea
ET-GT, University of Science and Technology, Seoul, 02792 Republic of Korea
Green School, Korea University, Anam-ro 145, Seongbukgu, Seoul, 02841 Republic of Korea
Search for more papers by this authorJens Oluf Jensen
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
Search for more papers by this authorQingfeng Li
Department of Energy Conversion and Storage, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
Search for more papers by this authorAbstract
Polybenzimidazole membranes imbibed with phosphoric acid can support high proton conductivity at 120–200 °C, and have therefore emerged as the state-of-the-art electrolytes for fuel cells operating in this temperature range. This work presents a novel and operationally simple methodology for preparing mechanically robust covalent network polybenzimidazole membranes containing up to 95 wt% phosphoric acid. Diamino-terminal pre-polymers of different chain lengths are first prepared, followed by addition of a trifunctional carboxylic acid. The crude solutions are cast and subsequently heat treated at up to 230 °C, yielding free-standing membranes of networked polybenzimidazole with high proton conductivity at up to 180 °C and encouraging fuel cell performance.
Conflict of Interest
The authors declare no conflict of interest.
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