Preparation And Performance Study Of PVA-based Benzimidazole Organic Gel Supercapacitor

Organogel is often used as electrolytes for supercapacitors because of its excellent flexibility,good environmental tolerance,high ionic conductivity,and suitable solvent-locking properties.Supercapacitors are used in portable electronic equipment,the new energy automobile industry,the military industry.Supercapacitors demonstrated excellent electrochemical performance as a new energy storage,such as fast charging rate,long cycle life,high power density,and wide operating temperature.Therefore,various types of organogel have been used in fields such as supercapacitors.However,the development and application of supercapacitors are limited by the properties of organogel because of the poor physical properties and low energy density.Athough remarkable achievements have been made in the raw materials and process design of organogel preparation,achieving excellent physical and electrochemical properties of organogel is still a significant challenge.Therefore,it is of great practical significance to prepare organogel with excellent physical and electrochemical properties for application in supercapacitors.（1）A PDBA organogel was successfully prepared by introducing it into DMSO.The PDBA organogel was made with DBA of synthetic,PVA,and H₂SO₄.The tensile stress-strain measurement further demonstrates PDBA organogel possesses an ultrahigh stretchable strain of up to～629%at room temperature.PDBA-SCs were obtained by assembling PDBA organogel with carbon electrodes,and the electrochemical performance was tested.The supercapacitor with PDBA demonstrated excellent electrochemical performance in a large potential window of-1V to 1 V,such as high ionic conductivity of 40 m S cm^-1,lower inner resistance of1.247Ω,high electrode specific capacitance of 232 F g^-1at a current density of 0.1 A g^-1,reaching an energy density as high as 16.16 W h kg^-1at a power density of 35.66k W kg^-1.More importantly,the supercapacitor with PDBA shown that LED bulbs of138 could be illuminated,which were illuminated for more than 3 min.（2）A PDBE organic gel with strong mechanica solid properties was successfully prepared by adding DBE into the PVA-soluble DMSO with H₂SO₄as a catalyst and conductive agent.The tensile stress-strain measurement further demonstrates PDBE organogel possesses an ultrahigh stretchable strain of up to～685%,and it can lift about a 2 kg reactor at room temperature.In offenes system,PDBE organogels and carbon electrodes were assembled into PDBE-SCs,and the electrochemical performance was tested.PDBE-SCs have good multiplier performance in a large potential window of-0.9 V to 0.9 V,such as lower inner resistance of 1.1Ω,high electrode specific capacitance of 187.5 F g^-1at a current density of 0.1 A g^-1.More importantly,the supercapacitor with PDBE shown that a LED bulbs could be illuminated,which were illuminated for more than 8 min.（3）A PBCBP-2-HQ organogel with excellent electrochemical performance was designed and prepared by adding HQ.The tensile stress-strain measurement further demonstrates PBCBP-2-HQ organogel possesses an ultrahigh stretchable strain of up to～480%at room temperature.PBCBP-2-HQ-SCs were obtained by assembling PBCBP-2-HQ organogel with carbon electrodes,and the electrochemical performance was tested.The supercapacitor with PBCBP-2-HQ demonstrated excellent electrochemical performance in a large potential window of-0.9 V to 0.9 V,such as high ionic conductivity of 30.67 m S cm^-1,lower inner resistance of 1.63Ω,highelectrode specific capacitance of 657.5 F g^-1at a current density of 1 A g^-1,reaching an energy density as high as 36.98 W h kg^-1at a power density of 436.68 k W kg^-1.More importantly,the supercapacitor with PDBA shown that LED bulbs of 72 could be illuminated,which were illuminated for more than 30 s.