Fabrication and Performance of Metal Organic Framework Zn-BTC/rGO Nanocomposites
As electrode material for supercapacitors,graphene-supported Zn-BTC metal-organic framework materials(Zn-BTC/rGO)with different morphologies were synthesized via a simple ultrasonic vibration method.The prepared Zn-BTC/rGO materials were characterized by means of TG,SEM,XRD,BET,Raman and electrochemical workstation in terms of the structure,morphology and electrochemical property.Their capacitance performance was examined by a three-electrode system.The results show that the synthesized one-dimensional rod-like Zn-BTC is uniformly anchored to the wrinkled layer of gra-phene nanosheets,and the material exhibits excellent capacitance performance,with a specific capaci-tance of 182.4 C·g-1(1 A·g-1),which is better than the graphene-supported two-dimensional sheet-like Zn-BTC(139.3 C·g-1),graphene(97.9 C·g-1)and simple one-dimensional rod-like Zn-BTC(62.8 C·g-1).A symmetrical supercapacitor was assembled with the graphene supported one-dimensional rod-shaped Zn-BTC,which presents excellent performance:the specific capacity of 57.7 F·g-1 at a current density of 1 A·g-1,the maximum energy density of 1.99 Wh·kg-1 at a power density of 1390 W·kg-1,and the specific capacity retention rate of 90.3％ after 2000 charge-discharge cycles.
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