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<p>The rapid growth of nuclear energy has led to the annual production of thousands of tons of high-level liquid waste, with radioactive iodine being a major and dangerous component. However, efficient capture and conversion of radioactive iodine remains a critical challenge in the field of materials science. Here, to address the issue, we constructed two nitrogen-rich cage-based covalent organic frameworks (Cage-COF-TB and Cage-COF-NTBA) via rapid amino-alkyne click polymerization between amine-functionalized organic cages and alkyne monomers, affording crystalline β-ketoenamine-linked frameworks within 6 h. Both Cage-COFs exhibit exceptional iodine vapor uptake capacities, with values of 6.35 and 4.65 g g<sup>−1</sup>, respectively. Upon iodine loading, the electronic conductivity of the Cage-COFs increases significantly, enabling their application as cathode materials in lithium-iodine batteries. The I<sub>2</sub>@Cage-COF-NTBA electrode delivers an initial discharge capacity of 147 mAh g<sup>−1</sup> at 0.3 A g<sup>−1</sup> and exhibits long-term cycling stability with an ultralow capacity fading rate of 0.018% per cycle over 1000 cycles at 1 A g<sup>−1</sup>. This work presents the first β-ketoenamine-linked Cage-COF platform for high-temperature iodine vapor capture and energy conversion, offering a promising strategy for the immobilization and reutilization of radioactive iodine from high-level nuclear waste.</p>

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Click chemistry for efficient preparation of cage-based covalent organic frameworks featuring high iodine uptake for lithium-iodine battery

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Xuelong He,
  • Wenxiao Bi,
  • Feng Chen,
  • Ju Duan,
  • Tiejun Chen,
  • Baokang Lyu,
  • Xinghao Li,
  • Xiaofu Liu,
  • Minglei Wang,
  • Weiyi Zhang,
  • Yaozu Liao

摘要

The rapid growth of nuclear energy has led to the annual production of thousands of tons of high-level liquid waste, with radioactive iodine being a major and dangerous component. However, efficient capture and conversion of radioactive iodine remains a critical challenge in the field of materials science. Here, to address the issue, we constructed two nitrogen-rich cage-based covalent organic frameworks (Cage-COF-TB and Cage-COF-NTBA) via rapid amino-alkyne click polymerization between amine-functionalized organic cages and alkyne monomers, affording crystalline β-ketoenamine-linked frameworks within 6 h. Both Cage-COFs exhibit exceptional iodine vapor uptake capacities, with values of 6.35 and 4.65 g g−1, respectively. Upon iodine loading, the electronic conductivity of the Cage-COFs increases significantly, enabling their application as cathode materials in lithium-iodine batteries. The I2@Cage-COF-NTBA electrode delivers an initial discharge capacity of 147 mAh g−1 at 0.3 A g−1 and exhibits long-term cycling stability with an ultralow capacity fading rate of 0.018% per cycle over 1000 cycles at 1 A g−1. This work presents the first β-ketoenamine-linked Cage-COF platform for high-temperature iodine vapor capture and energy conversion, offering a promising strategy for the immobilization and reutilization of radioactive iodine from high-level nuclear waste.