类沸石咪唑酯骨架化合物ZIF-67的超声波辅助快速合成及其超级电容性能研究

Research on ultrasonic assisted rapid synthesis of zeolitic imidazolate framework-67(ZIF-67) and its supercapacitor performance

通过超声波辅助的方法,在较短时间内合成大量粒径可控的ZIF-67材料.利用XRD和SEM对合成的ZIF-67进行结构表征和形貌分析,并对其进行氮气等温吸脱附测试,结果表明:该方法制备的ZIF-67具有更高的结晶度、规整的菱形十二面体形貌,以及较高的孔隙度和比表面积.将其作为超级电容器电极材料,利用循环伏安、恒流充放电等电化学测试方法研究其电化学性能,结果表明:当电流密度为0.5 A/g时,超声波辅助合成的ZIF-67比电容为93 F/g,大于静置条件下合成的ZIF-67;当电流密度为1 A/g时,超声波辅助合成的ZIF-67充放电循环1000次后,其电容保持率为98.6%,具有优异的循环稳定性.

A large amount of size tunable zeolitic imidazolate framework-67（ZIF-67） was synthesized in a shot time with ultrasonic assisted method.The structure and morphology of synthesized materials were characterized with XRD and SEM.Nitrogen adsorption-desorption technique was also used to characterize the synthesized ZIF-67.Results showed that the ZIF-67 prepared by this method had higher crystallinity,regular rhombic dodecahedral morphology,and higher porosity and specific surface area.As supercapacitor electrode materials,cyclic voltammetry（CV） and galvanostatic charge/discharge（GCD） measurements were carried out to test the electrochemical performance of synthesized materials.The results showed that ZIF-67 synthesized by ultrasonic assisted method delivered a specific capacitance of 93 F/g at 0.5 A/g,which was much higher than that of ZIF-67 synthesized under static condition.When current density was 1 A/g,the specific capacitance of ZIF-67 synthesized by ultrasonic assisted mehtod could be retained to 98.6% of the initial value after 1000 cycles,demonstrating the excellent cycling stability.