Wang Teng, Lei Jiaqi, Wang You, Pang Le, Pan Fuping, Chen Kai-Jie, Wang Hongxia
Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China.
School of Chemistry and Physics, Faculty of Science, Queensland University of Technology, Brisbane, QLD, 4001, Australia.
Small. 2022 Aug;18(32):e2203307. doi: 10.1002/smll.202203307. Epub 2022 Jul 17.
Metal-organic frameworks (MOFs), known as porous coordination polymers, have attracted intense interest as electrode materials for supercapacitors (SCs) owing to their advantageous features including high surface area, tunable porous structure, structural diversity, etc. However, the insulating nature of most MOFs has impeded their further electrochemical applications. A common solution for this issue is to transform pristine MOFs into more stable and conductive metal compounds/porous carbon materials through pyrolysis, which however losses the inherent merits of MOFs. To find a consummate solution, recently a surge of research devoted to improving the electrical conductivity of pristine MOFs for SCs has been carried out. In this review, the most related research work on pristine MOF-based materials is reviewed and three effective strategies (chemical structure design of conductive MOFs (c-MOFs), composite design, and binder-free structure design) which can significantly increase their conductivity and consequently the electrochemical performance in SCs are proposed. The conductivity enhancement mechanism in each approach is well analyzed. The representative research works on using pristine MOFs for SCs are also critically discussed. It is hoped that the new insights can provide guidance for developing high-performance electrode materials based on pristine MOFs with high conductivity for SCs in the future.
金属有机框架材料（MOFs），即多孔配位聚合物，因其具有高比表面积、可调节的多孔结构、结构多样性等优势特性，作为超级电容器（SCs）的电极材料引起了广泛关注。然而，大多数MOFs的绝缘性质阻碍了它们进一步的电化学应用。解决这个问题的一个常见方法是通过热解将原始MOFs转化为更稳定且导电的金属化合物/多孔碳材料，不过这会损失MOFs的固有优点。为找到一个完美的解决方案，最近开展了大量致力于提高原始MOFs用于SCs时导电性的研究。在这篇综述中，对基于原始MOF材料的最相关研究工作进行了综述，并提出了三种有效策略（导电MOFs（c-MOFs）的化学结构设计、复合设计和无粘合剂结构设计），这些策略可以显著提高其导电性，进而提高SCs中的电化学性能。对每种方法中导电性增强机制进行了深入分析。还对使用原始MOFs用于SCs的代表性研究工作进行了批判性讨论。希望这些新见解能够为未来开发基于具有高导电性的原始MOFs用于SCs的高性能电极材料提供指导。
