Left: The article was selected as the inside cover of Advanced Functional Materials; Right: The performance and structural diagram of solid supercapacitors based on conductive MOF nanoarrays.
Metal-organic frameworks (MOFs) are crystalline porous materials (like porous sponges) that have a large specific surface area of â€‹â€‹over 7,000 square meters per gram and are expected to be extremely promising electrode materials for electrochemical energy storage. At present, more than 20,000 types of MOF materials have been synthesized. However, the low conductivity has severely limited its application in the field of energy storage. The use of pure MOF materials directly as electrodes for energy storage is rarely reported.
Recently, the Xu Gang Group of the State Key Laboratory of Structural Chemistry of the Institute of Structure Research of the Chinese Academy of Sciences and the Wang Yaobing Research Group of the Key Laboratory of Functional Nanostructure Design and Assembly of the Chinese Academy of Sciences cooperated with the use of conductive MOFs nano-array as the sole electrode material to construct a high Area capacitance symmetric solid super capacitor. Solid supercapacitors based on conductive MOFs nanoarrays exhibit an area capacitance of ~22Î¼Fcmâˆ’2, which is higher than most carbon materials (less than 10Î¼Fcmâˆ’2) and even comparable to graphene-based symmetric solid supercapacitors (18.9â€“25Î¼Fcmâˆ’2) . Compared with powder materials, these nanostructured electrodes can significantly reduce the resistance of the system and the charge transfer resistance between the interfaces, effectively increasing the charge transfer rate between the nano-array and the electrolyte. The above structural advantages can greatly improve the overall performance of the device, in particular, can obtain a high rate of capacitance. It is noteworthy that, in terms of synthesis, graphene is usually harsh (strong acids, strong oxidants, and time-consuming) compared to conductive MOF materials that are synthesized at temperatures slightly above room temperature in a matter of hours. Efficient.
This work is a breakthrough in the application of conductive MOF materials in the field of energy, and provides a good starting point for the future development of conductive MOF electrode materials, and was published in Advanced Functional Materials. 2017, DOI: 10.1002/adfm. 201702067) was selected by the magazine as the inside cover. This work was supported by the National Natural Science Foundation of China (Nos.51402293, 21501173 and 21550110194), the Chinese Academy of Sciences Strategic Leading Science and Technology Project (Class B) Project (No.XDB20000000), and the Frontier Science and Education Bureau of the Chinese Academy of Sciences Frontier Science Research Project (No.QYZDB- SSW-SLH023) and the Natural Science Foundation of Fujian Province (Nos.2016J06006, 2015J01230 and 2014J05027) support.
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