Preparation and Properties of Phosphonic Acid-Functionalized Ionomeric Binder for High-Temperature Proton Exchange Membrane Fuel Cells
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내용
The utilization of phosphoric acid (PA) in HT-PEMFC presents challenges, such as leakage and instability at temperatures around 200°C. These issues can compromise the membrane's integrity and reduce the fuel cell's efficiency and lifespan. To address these problems, our study investigates phosphonated aromatic polymers as a potential solution. We have developed a novel binder to replace the PA-polybenzimidazole system in high-temperature PEMFCs. The synthetic process involves meticulous chloromethylation, phosphonation, and acidification steps, resulting in polymers with various ion exchange capacities (IECs). The exceptional thermal stability of the polymer, up to ~400°C, demonstrates its potential as a binder in catalyst layers in fuel cell applications. Additionally, we present the ion conductivity, water uptake, and other electrochemical data of the synthesized binder polymer, highlighting its suitability and performance in HT-PEMFCs.