Porous carbon derived from metal-organic framework@graphene quantum dots as electrode materials for supercapacitors and lithium-ion batteries.
Porous carbon derived from metal-organic framework@graphene quantum dots as electrode materials for supercapacitors and lithium-ion batteries.
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金属有机框架多孔碳@石墨烯量子点作为超级电容器和锂离子电池的电极材料
作者：
通过一种简单的方法将金属有机骨架（ZIF-8）衍生的多孔碳与石墨烯量子点（GQD）结合，制备了C@GQD复合材料。所得复合材料具有668 m2 g-1的高比表面积，并包含许多微孔和中孔。作为超级电容器电极，该材料显示出优异的双层电容和在2 A g-1下130 F g-1的高容量保持率。即使在10000次充放电循环后也观察到优异的长期稳定性。此外，该复合物作为锂离子电池的负极材料表现出良好的可逆容量和出色的循环稳定性（在100 mA g-1下，200次循环后为493 mA h g-1）。MOF衍生的多孔碳和GQD的协同效应是改善电化学性能的原因。通过一种简单的方法将金属有机骨架（ZIF-8）衍生的多孔碳与石墨烯量子点（GQD）结合，制备了C@GQD复合材料。
The C@GQD composite was prepared by the combination of metal–organic framework (ZIF-8)-derived porous carbon and graphene quantum dots (GQDs) by a simple method. The resulting composite has a high specific surface area of 668 m2 g−1 and involves numerous micro- and mesopores. As a supercapacitor electrode, the material showed an excellent double-layer capacitance and a high capacity retention of 130 F g−1 at 2 A g−1. The excellent long-term stability was observed even after ∼10 000 charge–discharge cycles. Moreover, the composite as an anode material for a lithium-ion battery exhibited a good reversible capacity and outstanding cycle stability (493 mA h g−1 at 100 mA g−1 after 200 cycles). The synergistic effect of a MOF-derived porous carbon and GQDs was responsible for the improvement of electrochemical properties. The C@GQD composite was prepared by the combination of metal–organic framework (ZIF-8)-derived porous carbon and graphene quantum dots (GQDs) by a simple method.
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