钴基金属有机框架-聚吡咯复合材料电化学性能研究  

Electrochemical properties of composites cobalt-based metal-organic frameworks and polypyrrole

作　　者：李毅 杨亚杰 LI Yi;YANG Yajie(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学光电科学与工程学院,成都611731

出　　处：《电子科技大学学报》2025年第2期184-190,共7页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(61971112)。

摘　　要：具有丰富多孔结构金属有机框架(MOF)在超级电容器领域拥有巨大潜力,但其固有的低导电性严重制约了其在电极材料方面的应用。通过将MOF晶粒嵌入至石墨烯(GE)的三维立体网络内部,并通过共轭聚合物聚吡咯(PPy)的长链结构,共同构筑起集3D分级多孔特性和高度稳定、高效导电性于一体的MOF/PPy/GE三元复合骨架。研究结果证实小比例掺杂PPy的钴(Co)基MOF能在三维网格中更加均匀地分散镶嵌,协同石墨烯纳米片层与导电性优异的PPy链段形成稳定的多级孔隙三维网络结构,有效缓解了石墨烯层间的堆砌效应。电化学性能测试数据显示,制备的复合电极材料显示了出色的电化学储能能力,比电容高达403.56 F/g,并在经过10 000圈循环测试后仍能保持高达98.25%的电容稳定性,体现了优良的超电容性能。Although metal-organic frameworks(MOF)possess a rich porous structure and have greatpotential in the field of supercapacitors,their inherent low electrical conductivity severely limits their practical useas electrode materials.To this end,by embedding MOF grains into the three-dimensional(3D)network of graphene(GE),and through the long-chain structure of the conjugated polymer polypyrrole(PPy),the MOF/PPy/GE ternarycomposite skeleton is constructed,which combines the 3D hierarchical porous properties and highly stable andefficient electrical conductivity.The results confirmed that cobalt-based MOFs doped with PPy in a smallproportion can be more uniformly dispersed and embedded into the 3D lattice,thus synergizing the graphene nano-sheets with the PPy chain segments with excellent electrical conductivity to form a stable multilevel pore 3Dnetwork structure,effectively alleviating the stacking effect between the graphene layers.The electrochemicalperformance test data show that the prepared ternary composite electrode material displays excellentelectrochemical energy storage capability,with a specific capacitance as high as 403.56 F/g,and maintains acapacitance stability of as high as 98.25%after 10000 cycles,which fully reflects the excellent supercapacitanceperformance.

关 键 词：超级电容器 金属有机框架 聚吡咯 石墨烯 三维骨架 

分 类 号：TQ035[化学工程]