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High-performance asymmetric supercapacitors based on MOF-derived nanoporous carbon

Mengyao Yao  Lei Jin  赵昕  Qinghua Zhang  
【摘要】:Metal-organic frameworks(MOFs) have received a lot of attention as promising electrode materials in supercapacites(SCs) because of their high specific surface area and high porosity. Nanoporous carbon(NPC) materials with high specific surface area also have attracted increasing attention for electrochemical energy storage application. In the present work, MOF-derived nanoporous carbon(MOF-NPC) was fabricated by direct carbonization of zine-based MOFs and asymmetric SCs was developed successfully using MOF-NPC/MnO_2 as the positive electrode and MOF-NPC as the negative electrode in a neutral aqueous Na_2SO_4 electrolyte. Due to the excellent structure of MOF-NPC as a matrix, the optimized asymmetric SCs can be cycled reversely in the voltage range of 0-2.2V, and exhibit a maximum energy density of 76.1 Wh kg-1, demonstrating a good potential for the practical applications of energy storage devices.

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