金属有机框架化合物Zn<sub>4</sub>O(BDC)<sub>3</sub>材料的制备、结构及电容性能

doi:10.11896/cldb.18040289

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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.

Key words： metal-organic frameworks Zn₄O(BDC)₃ specific capacitance pseudocapacitor supercapacitor

Published: 31 May 2019

CLC number:

O646

About author:: Ming Liureceived her B.S. degree in organic chemistry from Sichuan University and Ph.D. degree in materials science and engineering from Dalian Jiaotong University. She was appointed to the faculty upon graduation, and is currently a associate professor of the DJTU. She has published more than 30 journal papers, applied 5 national invention patents and 3 of them were autho-rized. Her research interests focus on the surface modification of metal materials, the preparation of fuel cell key component, and design & preparation & property control about MOFs as electrode materials for supercapacitors.

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	LIU Ming
	XU Hongfeng
	ZHOU Yanan
	HAO Yu

Cite this article:

LIU Ming,XU Hongfeng,ZHOU Yanan, et al. Preparation, Structure and Capacitance Property of Zn₄O(BDC)₃ Crystals ofMetal-Organic Frameworks[J]. Materials Reports, 2019, 33(12): 1955-1958.

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http://www.mater-rep.com/EN/10.11896/cldb.18040289 OR http://www.mater-rep.com/EN/Y2019/V33/I12/1955

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