Fabrication of thermally cross-linked polybenzimidazole membranes using a di-azide cross-linker for high temperature proton exchange membrane fuel cells
Hyejin Kim , Junghwan Kim , Jungha Kim , So Young Lee , Seongwoo Kim , Jong-Chan Lee
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引用次数: 0
Abstract
Cross-linked poly (4,4′-(diphenyl ether)-5,5′-bibenzimidazole) (OPBI) membranes are fabricated via an in-situ casting process using Ethynyl-grafted OPBI as the matrix and 4,4′-diazido-2,2′-stilbenedisulfonic acid disodium salt tetrahydrate (DSDAD) as the cross-linker, for high temperature proton exchange membrane fuel cell applications. The Ethynyl-grafted OPBI is synthesized through an N-substitution reaction with propargyl bromide to introduce cross-linkable sites into the OPBI backbone. Cross-linking is achieved through azide-alkyne click reactions and the dimerization of ethynyl groups, resulting in membranes that exhibit enhanced oxidative stability and mechanical properties compared to the linear OPBI membrane. Additionally, these membranes demonstrate increased proton conductivity, attributed to the unique characteristics of DSDAD as the cross-linker, which forms multiple hydrogen bonds within the polymer matrix and generates triazole linkages through the cross-linking reaction. With these improvements in various properties, the C_E-OPBI-2, featuring an optimum degree of cross-linking attains a power density 27 % higher than that of the unmodified OPBI membrane.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems