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Preparation and Properties of Phosphonated Polysiloxane Proton Exchange Membrane
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DOI：10.11777/j.issn1000-3304.2025.25186.png)
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Abstract
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The phosphonyl groups were covalently grafted onto 3-aminopropyl (diethoxymethyl)silane (3-APDEMS) via a phosphonylation reaction. A phosphonated polysiloxane network was prepared by dehydration condensation, and the network was subsequently blended with chitosan to fabricate the phosphonated polysiloxane/chitosan composite proton exchange membrane (PBS-PA/CTS). The microstructure, surface morphology, and elemental distribution of membrane were characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS). The effect of phosphoric acid loading on the proton conductivity of membrane was systematically investigated. The results confirmed the successful -1 grafting of phosphoric acid onto 3-APDEMS via N-C-P bonds, with uniform phosphorus distribution throughout the membrane. The composite membrane demonstrated excellent thermal stability (about 6% mass loss at 200 degrees C) and moderate water uptake (<15% at 25 degrees C). Under anhydrous conditions at 140 degrees C, the proton conductivity achieved 63 mS/cm, while single-cell tests yield an open-circuit voltage of 0.88 and a maximum power density of 420.2 mW/cm & sup2;, indicating excellent performance under high-temperature, low-humidity conditions. [GRAPHICS]
Keywords:
High-temperature proton exchange membrane
Polysiloxane
Phosphorization reaction
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