HKUST-1衍生Cu类普鲁士蓝的超电容性能

Supercapacitive performance of HKUST-1-derived copper Prussian blue

由于传统方法制备规整的中空纳米颗粒条件较难掌控,本文借用了HKUST-1六面体模板来合成目标纳米Cu类普鲁士蓝(CuHCF)作为超级电容正极材料。首先通过添加PVP辅助水热合成Cu-MOF前驱物,然后用K3[Fe(CN)6]对Cu-MOF处理得到CuHCF。用X射线衍射仪(XRD)和钨灯丝扫描电镜(SEM)探究了处理前后的形貌和结构差异,并用氮气吸脱附法表征了CuHCF孔径及比表面积差异,使用循环伏安法、恒流充放电法和交流阻抗法等手段研究了CuHCF的电化学性能,同时探究了合成中表面活性剂PVP对普鲁士蓝结构形貌和电化学性能的影响。结果表明:在0.5 mol/L Na2SO4中性溶液中,1 A·g^-1的电流密度下,PVP辅助合成有微孔结构的CuHCF表现出254 F·g^-1的比电容,容量有显著提升,并具有优异的倍率性能。

It is difficult for traditional methods to control the synthetic conditions of hollow nanoparticles.Here HKUST-1 hexahedral templates were used to fabricate nano-CuHCF for anode materials for supercapacitors.CuMOF was first synthesized by hydrothermal method and then treated by K3[Fe(CN)6]to obtain CuHCF.The crystal structure and morphology of the CuMOF and CuHCF were characterized by XRD and SEM.The pore size and specific surface area of the two samples were measured by BET N2 adsorption/desorption experiment.The electrochemical properties of the CuHCF were studied by cyclic voltammetry,galvanostatic charge-discharge and EIS method.The effect of PVP on CuHCF􀆳s morphology and electrochemical properties was also investigated.The results show that in 0.5 mol/L Na2SO4 neutral solution the microporous CuHCF exhibits a specific capacitance of 254 F·g^-1 at 1 A·g^-1,which is significantly increased,and manifested excellent rate performance.