Triazine-functionalized Nitrogen-rich Covalent Organic Framework as an electrode material for Aqueous Symmetric Supercapacitor.

Abstract

Covalent triazine frameworks, with their ordered pores and crystalline structure that exhibit heteroatom impacts, demonstrate outstanding chemical stability, making them designable for charge storage applications. In this study, the TPT@BDA-COF was synthesized using 4',4''',4'''''-(1,3,5-Triazine-2,4,6-triyl)tris(([1,1'-biphenyl]-4-amine)) (TPT) and 4,4'-Oxydibenzaldehyde (BDA) following polycondensation process. Interestingly, these resulted in the fabrication of a well-connected, orderly porous crystalline structure, redox-active moiety, and high doping N (~13.6%). The three-electrode electrochemical study, showed a stable electrochemical potential window of 1.8 V (-0.45 to +1.35) in 1 M NaClO4 electrolyte, it exhibited a high specific capacitance of 92.6 mF/cm2 with a high energy density 41.7 Wh/kg respectively. The symmetric supercapacitor designed using TPT@BDA-COF as both anode and cathode exhibited high specific capacitance (F/g) and gravimetric energy density (Wh/kg):17.8, 36.9, 43.7, 47.7 and 3.5, 16.6, 13.7, 21.6 in 1 M CH3COONa, 1 M Na2SO4, 1 M NaNO3, 1 M NaClO4 electrolyte respectively. It showed excellent cyclic stability (105.2%), and Coulombic efficiency (97.5%) even after 10k GCD cycles in 1 M NaClO4 at 2 A/g. Interestingly, ClO4- anions exhibited a better chaotropic nature (water structure breaker) as compared to CH3COO-, SO4-2, and NO3-.