沸石咪唑骨架衍生空心纳米电极材料可控制备及其电化学性能研究  

Controllable preparation of hollow nanoelectrode materials derived from zeolitic imidazolate framework and study of their electrochemical properties

作　　者：李雅月 赵斌[1] LI Yayue;ZHAO Bin(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化工学院,上海200093

出　　处：《有色金属材料与工程》2024年第2期27-38,共12页Nonferrous Metal Materials and Engineering

基　　金：上海市自然科学基金资助项目(21ZR1445700)。

摘　　要：超级电容器是介于可充电电池和传统电容器之间的一种新型储能器件。它具有高功率密度、快速充放电和环境友好等优点。在众多应用于超级电容器的电极材料中,金属有机骨架材料因具有大的比表面积,可灵活调控的组成和结构,是十分理想的电极材料之一,又由于其易于合成、独特的结构和反应特性,也是制备纳米结构电极材料的理想模板之一。以沸石咪唑骨架(zeolitic lmidazolate framework,ZIF)-67为前驱体,采用二水合钼酸钠盐溶液刻蚀的方法成功制备了空心CoMo层状双金属氢氧化物(layered double hydroxides,LDH)纳米笼结构,同时还讨论了钼酸钠的用量对最终产物形貌和性能的影响。当用作超级电容器电极材料时,所制备的空心Co1Mo5 LDH在1 A/g的时候最多可提供578 F/g的比电容,当电流密度增加到10 A/g时,比电容保持在346 F/g。与活性炭组装成非对称超级电容器后,该储能器件在功率密度750 W/kg时,能量密度最大可达到21.25 W·h/kg。在5 A/g的电流密度下,经过15000次充放电循环后,仍保持了90%的初始容量。Supercapacitor is a new type of energy storage device between rechargeable batteries and traditional electrostatic capacitors.It has the advantages of high power density,fast charging and discharging speed,and environmental friendliness.Among many electrode materials used in supercapacitors,metal organic framework material is considered as one of the most ideal electrode materials due to their large specific surface area,flexible composition and structure,and is also one of the ideal templates for preparing nanostructured electrode materials due to its easy synthesis,unique structure,and reaction characteristics.In this paper,hollow CoMo layered double hydroxides(LDH)nanocage structures were successfully prepared using zeolitic imidazolate frameworks(ZIF)-67 as a precursor by etching with sodium molybdate dihydrate solution.The effect of sodium molybdate content on the morphology and properties of the final product was also discussed.When used as an electrode material for supercapacitors,the prepared hollow Co1Mo5 LDH can provide a specific capacitance up to 578 F/g at 1 A/g,and the specific capacitance remains at 332 F/g when the current density increases to 10 A/g.After assembling an asymmetric supercapacitor with activated carbon,the energy density of the energy storage device can reach a maximum of 21.25 W·h/kg at a power density of 750 W/kg.At a current density of 5A/g,it retains almost 90%of its initial capacity after 15000 charge-discharge cycles.

关 键 词：ZIF-67 纳米材料 空心纳米笼 层状双金属氢氧化物 

分 类 号：TQ152[化学工程—电化学工业]