Fluorinated pillared-layer metal-organic framework microrods for improved electrochemical cycling stability  

作　　者：Shasha Zheng Yue Ru Huaiguo Xue Huan Pang 

机构地区：[1]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225009,China

出　　处：《Chinese Chemical Letters》2021年第12期3817-3820,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. U1904215);the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP);Natural Science Foundation of Jiangsu Province (No. BK20200044);Excellent doctoral dissertation of Yangzhou University and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX19_2099)。

摘　　要：Developing metal-organic framework(MOF)-based materials with good cyclic stability is the key to their practical application. Fluorinated organic compounds are usually highly chemically stability due to the high electronegativity of fluorine. Also, the pillared-layer structures based on coordination bonds have better structure and thermal stability than those based on hydrogen bonds. Herein, the fluorinated pillared-layer [Ni(2,3,4,5-tetrafluorobenzoic acid)(4,4-bipyridine)]nMOF([Ni(TFBA)(Bpy)]n) materials were constructed through a facile room-temperature solution reaction and used as electrode materials for supercapacitors. Surprisingly, the size/morphology of Ni(TFBA)(Bpy)nMOFs could be adjusted by varying the synthesis time. Benefting from the short ion diffusion length, unique pillar-layer structure, and strong intercomponent synergy of organic ligands, the Ni(TFBA)(Bpy)nMOF microrods showed a higher electrochemical energy storage capability than bulk MOFs. At the same time, compared to the non-fluorinated [Ni(benzoic acid)(Bpy)]nMOFs(31.5% capacitance decay), the fluorinated Ni(TFBA)(Bpy)n MOFs have a higher cycle stability with only 2.6% capacitance loss after 5000 cycles at 3 m A/cm^(2).

关 键 词：Fluorinated metal-organic framework Pillar-layer structure Microrod Cyclic stability Electrochemical energy storage SUPERCAPACITOR 

分 类 号：O641.4[理学—物理化学]