Oriented construction of efficient intrinsic proton transport pathways in MOF-808,Journal of Materials Chemistry A

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Oriented construction of efficient intrinsic proton transport pathways in MOF-808
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-08 , DOI: 10.1039/d2ta04572a
Xiao-Min Li ₁ , Yameng Wang ₂ , Yongbiao Mu ₂ , Junkuo Gao ₁ , Lin Zeng _{2,

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Affiliation

The development of advanced materials needs to be continuously promoted by the cyclic process of mastering the structure–activity relationship, designing the experimental scheme, measuring the performance and feeding back the design ideas. Therefore, understanding the proton conduction mechanism and orientally constructing efficient intrinsic proton transport pathways are very important for the research and development of proton conductors. Herein, we propose an effective and feasible strategy of replacing the formates and hydroxide groups coordinated with Zr in MOF-808 with 1H-imidazole-4-carboxylic acid (IMC) and 4,5-imidazoledicarboxylic acid (IMDC) containing imidazole groups to synthesize MOF-808-IMC and MOF-808-IMDC. The proton conduction performances of MOF-808-IMC and MOF-808-IMDC are much higher than that of the original MOF-808. Specifically, MOF-808-IMDC exhibits an intrinsic proton conductivity of 1.11 × 10⁻² S cm⁻¹ at 80 °C and 98% RH, which can be comparable with the performances of commercial perfluorosulfonic acid resin and other MOF-based proton conductors. It is also noted that the proton conductivity of MOF-808-IMDC has good cycling stability and durability, which suggests that it has the potential to be used as a PEM. Furthermore, the proton transfer mechanism has been clarified in detail, which can provide a theoretical basis for the preparation of excellent proton conductors.

中文翻译：

MOF-808中高效内在质子传输路径的定向构建

先进材料的发展需要通过掌握构效关系、设计实验方案、测量性能、反馈设计思路的循环过程不断推动。因此，了解质子传导机制，定向构建高效的本征质子传输通路，对于质子导体的研究和开发具有重要意义。在此，我们提出了一种有效且可行的策略，用含有咪唑基团的 1 H-咪唑-4-羧酸 (IMC) 和 4,5-咪唑二羧酸 (IMDC)取代 MOF-808 中与 Zr 配位的甲酸盐和羟基，以合成MOF-808-IMC和MOF-808-IMDC. MOF-808-IMC和MOF-808-IMDC的质子传导性能远高于原MOF-808。具体而言，MOF-808-IMDC在 80 °C 和 98% RH 下表现出 1.11 × 10 ^-2 S cm ^-1的本征质子电导率，可与商业全氟磺酸树脂和其他基于 MOF 的质子导体的性能相媲美. 还值得注意的是，MOF-808-IMDC的质子传导性具有良好的循环稳定性和耐久性，这表明它具有用作 PEM 的潜力。此外，详细阐明了质子转移机理，可为制备优良的质子导体提供理论依据。

更新日期：2022-08-08

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