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<p>Conventional AEMs usually have the linear structure with tight chain entanglement and chain stacking that severely hinder the transport of OH<sup>−</sup>, resulting in a decrease in ionic conductivity. In this work, a series of novel poly(aromatic amine-piperidinium-aryl) AEMs (QDPTP-<i>x</i>), with the triphenylamine (TPA) of triangular cone structure, was prepared. Meanwhile, using a combination of experimental and density functional theory (DFT) calculations methods, it demonstrated that propeller-shaped, large-volume, rigid TPA structural unit can reduce the stacking density of the polymer chains, constructing more favorable micro-phase separation structure and decreasing OH<sup>−</sup> transport resistance. The QDPTP-9% (9% is the molar percentage of TPA in the monomers) AEM shows the best overall performance, with acceptable dimensional stability (water uptake of 46.2%, swelling ratio of 14.5%), suitable OH<sup>−</sup> conductivity (105.6 mS/cm, 80&#xa0;°C) and excellent microphase separation structure. Importantly, it possesses good conductivity retention ratio of 88.6% after stabilizing in 3&#xa0;M NaOH for 2200&#xa0;h. Furthermore, the H<sub>2</sub>/O<sub>2</sub> fuel cell yields a peak power density of 421 mW/cm<sup>2</sup> at 80&#xa0;°C, and the fuel cell can operate at a constant current over 98&#xa0;h without much voltage decay. Therefore, this strategy of incorporating bulk and branch structural unit in backbone could provide a new and effective exploration to reduce chain stacking and increase degrees of freedom, while improving OH<sup>−</sup> conductivity and maintaining dimensional stability and alkaline resistance.</p> Graphical abstract <p>Intercalation of triphenylamine into the polymer backbone ensures excellent ionic conductivity, providing a new and effective exploration to prepare AEMs with low cost and excellent performance.</p>

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Novel triangular pyramidal poly(arylamine-piperidine-aryl) anion exchange membranes for fuel cells

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • Linyi Deng,
  • Yi Han,
  • Wenli Ma,
  • Junkai Chai,
  • Zhiyou Zhu,
  • Shaorong Zhang,
  • Hong Zhu,
  • Zhongming Wang

摘要

Conventional AEMs usually have the linear structure with tight chain entanglement and chain stacking that severely hinder the transport of OH−, resulting in a decrease in ionic conductivity. In this work, a series of novel poly(aromatic amine-piperidinium-aryl) AEMs (QDPTP-x), with the triphenylamine (TPA) of triangular cone structure, was prepared. Meanwhile, using a combination of experimental and density functional theory (DFT) calculations methods, it demonstrated that propeller-shaped, large-volume, rigid TPA structural unit can reduce the stacking density of the polymer chains, constructing more favorable micro-phase separation structure and decreasing OH− transport resistance. The QDPTP-9% (9% is the molar percentage of TPA in the monomers) AEM shows the best overall performance, with acceptable dimensional stability (water uptake of 46.2%, swelling ratio of 14.5%), suitable OH− conductivity (105.6 mS/cm, 80 °C) and excellent microphase separation structure. Importantly, it possesses good conductivity retention ratio of 88.6% after stabilizing in 3 M NaOH for 2200 h. Furthermore, the H2/O2 fuel cell yields a peak power density of 421 mW/cm2 at 80 °C, and the fuel cell can operate at a constant current over 98 h without much voltage decay. Therefore, this strategy of incorporating bulk and branch structural unit in backbone could provide a new and effective exploration to reduce chain stacking and increase degrees of freedom, while improving OH− conductivity and maintaining dimensional stability and alkaline resistance.

Graphical abstract

Intercalation of triphenylamine into the polymer backbone ensures excellent ionic conductivity, providing a new and effective exploration to prepare AEMs with low cost and excellent performance.