Preparation, Structure and Capacitance Property of Zn4O(BDC)3 Crystals ofMetal-Organic Frameworks
LIU Ming1, XU Hongfeng1, ZHOU Yanan1,2, HAO Yu1
1 College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028 2 Faculty of Science, Beijing University of Chemical Technology, Beijing 100029
Abstract: Specific capacitance and energy storage mechanism of Zinc-based metal-organic frameworks in 6 mol·L-1 KOH aqueous solutions, consisting of the secondary building units Zn4O(BDC)3 synthesized in a solvothermal process, were studied by cyclic voltammetry and electrochemical impedance spectroscopy analysis. The results demonstrated that the prepared Zn4O(BDC)3 grains with cubic hexahedron structure were 0.5—1 μm in size. The results for the capacitive performance from cyclic voltammetry revealed that Zn4O(BDC)3 samples had gravimetric capacitance up to 217.39 F·g-1 at a scan rate of 5 mV·s-1. The electrode materials retained about 82.58 F·g-1 capacitance, and CV curves kept their initial redox shape unchanged even at high scan rate of 200 mV·s-1, indicating pseudocapacitor energy storage mechanism and excellent rate capability for Zn4O(BDC)3 electrode. From Nyquist plot of Zn4O(BDC)3 materials, the smaller semicircle in the high-frequency region revealed the lower internal resistance of electrode materials, and the incomplete larger semicircle in the middle- and low-frequency region represented the higher charge-transfer resistance values during the charge-discharge process of active Zn2+ species, both of which implied that Zn4O(BDC)3 materials produced a better capacitance property.
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2019, Vol. 33 
