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Tailored Textural and Morphology for Tunable Charge Storage Capacity in Supercapacitor Application

Porous organic polymers are now emerging materials of interest for various fields like gas storage and sepa-ration, optoelectric application, catalysis and also for the energy storage system. Supercapacitors are such type of system which can store energy with high specific capacitance as well as high energy density. In this context, tuning the internal porosity by changing functionality in the polymer material for targeted energy storage remains a challenge. Herein we discussed a series of truxene based novel covalent organic polymers (Me-DAB, Et-DAB, But-DAB and Pent-DAB) with a wide range of available surface area, obtained by tailoring the length of the alkane chain (methyl to n-pentyl) attached with the truxene moiety. A maximum specific capacitance for Pent-DAB of 634 F g-1 was observed at 1 A g-1 with 91% ca-pacitance retention after 3000 charge-discharge cycles. The observed change in specific capacitance along the series is due to the change in surface area of the polymers. A high specific capacitance for the Pent-DAB was observed due to the de-localization of large number of electrolytes throughout the highly accessible surface area.