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<p>Metal-organic frameworks (MOFs) based on anion exchange membranes (AEMs) have garnered considerable interest, particularly for their potential to enhance ion conductivity by pre-introducing anions into MOFs. This approach is recognized as straightforward and effective for improving ion conductivity. However, developing high-performance AEMs is limited by the inherent instability and low resistance of MOFs. This study presents a novel 1,3,5-triazine <i>μ</i><sub>3</sub>-bridged neutral Cu(I) framework, designated <b>SXU-120</b> (where <b>SXU</b> represents Shanxi University). This framework is synthesized using melamine, a widely available industrial product, as the starting material, achieving a high space-time yield exceeding 1.1 kg m<sup>−3</sup> day<sup>−1</sup>. The organic ligands and metal ions in <b>SXU-120</b> are 3-connected, forming a rare <b>eta</b> topology with the point symbol 8<sup>3</sup>. <b>SXU-120</b> exhibits exceptional stability, even in a 10 M KOH solution, due to its high density of uncoordinated–NH<sub>2</sub> and carbonyl groups. Furthermore, the framework’s unique one-dimensional channels, characterized by their electronegativity, interact electrostatically with OH<sup>−</sup> ions, thereby accelerating OH<sup>−</sup> ion transfer along these channels. Consequently, the OH<sup>−</sup> conductivity of this material reaches an impressive 0.49 S cm<sup>−1</sup> at 90 °C under full humidity for 100 h, representing the highest OH<sup>−</sup> conductivity reported for MOF-based conductors to date. These properties make <b>SXU-120</b> a promising candidate for efficient AEM materials in next generation industrial applications.</p>

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Enhancing anion conductivity in a highly alkali-stable eta topologic Cu(I) framework via strong electrostatic repulsion

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Xiao-Lu Wang,
  • Shaohui Guo,
  • Chao Suo,
  • Fu-Qiang Zhang,
  • Jun-Hao Wang,
  • Wenjing Wang,
  • Daqiang Yuan,
  • Linfeng Liang,
  • Xian-Ming Zhang

摘要

Metal-organic frameworks (MOFs) based on anion exchange membranes (AEMs) have garnered considerable interest, particularly for their potential to enhance ion conductivity by pre-introducing anions into MOFs. This approach is recognized as straightforward and effective for improving ion conductivity. However, developing high-performance AEMs is limited by the inherent instability and low resistance of MOFs. This study presents a novel 1,3,5-triazine μ3-bridged neutral Cu(I) framework, designated SXU-120 (where SXU represents Shanxi University). This framework is synthesized using melamine, a widely available industrial product, as the starting material, achieving a high space-time yield exceeding 1.1 kg m−3 day−1. The organic ligands and metal ions in SXU-120 are 3-connected, forming a rare eta topology with the point symbol 83. SXU-120 exhibits exceptional stability, even in a 10 M KOH solution, due to its high density of uncoordinated–NH2 and carbonyl groups. Furthermore, the framework’s unique one-dimensional channels, characterized by their electronegativity, interact electrostatically with OH− ions, thereby accelerating OH− ion transfer along these channels. Consequently, the OH− conductivity of this material reaches an impressive 0.49 S cm−1 at 90 °C under full humidity for 100 h, representing the highest OH− conductivity reported for MOF-based conductors to date. These properties make SXU-120 a promising candidate for efficient AEM materials in next generation industrial applications.