Controllable Preparation Of Coordination Polymer Frameworks And Their Applications In Supercapacitors

With the growth of global energy demand,in recent years,the development of environmentally friendly and sustainable energy storage devices has aroused widespread research interest.Supercapacitors(SCs)have the advantages of fast charge/discharge rate,high power density,and long cycle life,and are considered to be excellent energy storage devices.Coordination polymer frameworks(CPFs)have broad application prospects in the field of supercapacitors due to their outstanding characteristics,e.g.,stable structure,inherent porosity,etc.Therefore,it is particularly critical to prepare new CPF materials for supercapacitors.In this thesis,firstly,coordination polymer framework materials are prepared by polymerization of organic ligands and metal ion centers.The application of these materials in supercapacitors is explored.The main research contents and results are as follows,(1)Using liquid-liquid interfacial polymerization,9,9'-(1,4-phenylene)bis(2,3,6,7-tetrahydroxyanthracene)is used as the organic ligand to coordinate with copper ions to prodcue a new type of coordination polymer framework.Its structure was characterized and tested.The film was then laser scribed into a planar micro-supercapacitor,which exhibits a volumetric specific capacitance as high as 121 F cm^-3.The maximum energy density and maximum power density of the device reached 52.6m Wh cm^-3 and 13.1 W cm^-3,respectively.More importantly,it shows AC line filtering performance(the phase angle is-84.2°at 120 Hz)and a short resistance-capacitance time constant of 0.08 ms.(2)Using the tube sealing method,chloranilic acid is used as an organic ligand to coordinate with Fe ions to form a metal-organic framework.Then,the material is used as electrode to made supercapacitor.After testing,it is found that the gravimetric specific capacitance of the device reached 162 F g^-1.And the maximum energy density and maximum power density of the device reached 22.5 Wh kg^-1 and 880 W kg^-1,respectively.The capacitance retention of the device is 88.5%after 3000 cycles.