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<p>A coordination polymer, {[Cd<sub>3</sub>L<sub>2</sub>(bipy)<sub>3</sub>(H<sub>2</sub>O)]·2H<sub>2</sub>O}<sub>n</sub> (Cd-L, H<sub>3</sub>L = 2-(3′,5′-dicarboxyphenyl)- 4-carboxypyridine, bipy = 2,2′-bipyridine), was synthesized and doped into Nafion to fabricate the Cd-L/Nafion-<i>x</i> (<i>x</i> = 1, 2, 3) composite membrane for use as the proton exchange membrane in fuel cells. Scanning electron microscope images revealed that the optimal doping concentration of Cd-L was 2%, suggesting good compatibility between the amphiphilic Cd-L and Nafion. Thermogravimetric analysis (TGA) and water uptake measurements indicated that despite the presence of hydrophobic regions in Cd-L, it still enhanced the water absorption capacity of the composite membrane. Alternating current (AC) impedance results demonstrated that even in the absence of acidic functional groups and continuous hydrogen bonds in Cd-L, the proton conductivity of this composite membrane increased by approximately 1.2 times. These enhancements were ascribed to the unique amphiphilic structure of Cd-L, which could simultaneously penetrate into the hydrophilic micelles and hydrophobic carbon backbone of Nafion, thereby expanding the inter-chain spacing of Nafion and enhancing its water absorption ability. The additional adsorbed water molecules and the hydrophilic regions of Cd-L together established more proton transfer pathways.</p>

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An Amphiphilic Coordination Polymer as a Filler for Proton Exchange Membrane: Synthesis, Structure and Proton Conductivity

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Jing Lu,
  • Huiqi Zou,
  • Houting Liu

摘要

A coordination polymer, {[Cd3L2(bipy)3(H2O)]·2H2O}n (Cd-L, H3L = 2-(3′,5′-dicarboxyphenyl)- 4-carboxypyridine, bipy = 2,2′-bipyridine), was synthesized and doped into Nafion to fabricate the Cd-L/Nafion-x (x = 1, 2, 3) composite membrane for use as the proton exchange membrane in fuel cells. Scanning electron microscope images revealed that the optimal doping concentration of Cd-L was 2%, suggesting good compatibility between the amphiphilic Cd-L and Nafion. Thermogravimetric analysis (TGA) and water uptake measurements indicated that despite the presence of hydrophobic regions in Cd-L, it still enhanced the water absorption capacity of the composite membrane. Alternating current (AC) impedance results demonstrated that even in the absence of acidic functional groups and continuous hydrogen bonds in Cd-L, the proton conductivity of this composite membrane increased by approximately 1.2 times. These enhancements were ascribed to the unique amphiphilic structure of Cd-L, which could simultaneously penetrate into the hydrophilic micelles and hydrophobic carbon backbone of Nafion, thereby expanding the inter-chain spacing of Nafion and enhancing its water absorption ability. The additional adsorbed water molecules and the hydrophilic regions of Cd-L together established more proton transfer pathways.