Construction Of Organic Complex Nanostructures And Their Application In Supercapacitors

Carbonyl conjugates,which are typical organic molecules with high electroactivity,have attracted tremendous attention in electrochemical energy storage due to their advantages of high theoretical capacity,fast reaction kinetics,diverse structures,low cost and easy availability.However,the poor electronic conductivity and dissolution problem lead to its low capacity and severe capacity decay,greatly hindering their applications in the field of energy storage.Great challenges lie in improving the electronic conductivity,suppressing the dissolution,and therefore achieving an enhanced rate performance and cycling stability.Chloranic acid is a kind of conjugated carbonyl compound with a small molecule and a high theoretical capacity.Similar to other carbonyl conjugates,it suffers from the poor conductivity and high solubility in acidic electrolytes.In this thesis,a new kind of charge-transfer complex（CAC）is formed and constructed on carbon cloth whereby the H bonding interactions between chloranic acid and albendazole.The electrochemical performance of CAC has been studied and optimized by PPy coating.Furthermore,inspired by its electroactivity and excellent photothermal effect,the application of the CAC in bifunctional printable microsuercapacitors has been demonstrated successfully.The main research contents and results are as follows:（1）A facile wet-chemistry method was developed to construct CAC nanoarrays on carbon cloth.The factors that may influence the reaction kinetics and final morphology were studied to obtain CAC nanoarrays with an optimized morphology.Then a layer of polypyrrole（PPy）is coated on the surface of CAC by the electrochemical deposition method to improve its electrochemical performance.Electrochemical results show that CAC exhibits a typical pseudocapacitive behavior with a high specific capacity and poor cycling performance.With the coating of PPy,the initial capacity reaches 146 mF cm^-2 at a current density of 10 mA cm^-2,and a high capacity retention up to 84%is maintained after 5000 cycles.（2）A screen-printable ink was prepared by mixing the CAC nanosheets with carbon nanotubes（CNTs）,which is used to fabricate a symmetric bifunctional microsupercapacitor by screen printing.Related results show that the fabricated bifunctional microsupercapacitor has both good photothermal performance and electrochemical performance.Under 1 sun illumination,a temperature increase of 14℃can be achieved.With 4-min illumination,the areal capacitance calculated from CV curves reaches 3.6 mF cm^-2,showing an increase of33.3%compared to that without illumination,demonstrating the successful construction of the bifunctional microsupercapacitor.