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New Covalent Organic Square Lattice Based on Porphyrin and Tetraphenyl Ethylene Building Blocks toward High-Performance Supercapacitive Energy Storage

Patra, BC and Bhattacharya, S (2021) New Covalent Organic Square Lattice Based on Porphyrin and Tetraphenyl Ethylene Building Blocks toward High-Performance Supercapacitive Energy Storage. In: Chemistry of Materials .

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Official URL: https://doi.org/10.1021/acs.chemmater.1c02973

Abstract

Covalent organic frameworks (COFs) are of increasing interest in the field of materials science. Polymerizations of the topologically fitted monomers into two-dimensional (2D) structures with a periodic order often make them crystalline. The existence of this structural periodicity and regular pores makes them effective for facile ion transport and storage applications. We report herein a new porphyrin-based 2D COF using Schiff base condensation reaction between 5,10,15,20-tetrakis(para-amino phenyl) porphyrin (TAPP) and 1,1,2,2-tetrakis(4-formyl-(1,1�-biphenyl))-ethane (TFBE) under solvothermal conditions. The as-prepared porphyrin-tetraphenyl ethylene COF (PT-COF) possesses high crystallinity along with a large surface area of 1998 m2 g-1. The PT-COF electrode was used as a supercapacitive energy storage system with the combination of an electrochemical double-layer capacitor and pseudocapacitor. This COF showed a maximum specific capacitance of 1443 F g-1 at a current density of 1 A g-1 in 0.5 M H2SO4 with 91 capacity retention after 3000 cycles. The presence of the porphyrin unit inside the framework causes good redox activity in the acidic media. During the cathodic scan, the porphyrin unit H2P got protonated, followed by 2e- reduction to form a 20�-electronic system H4P. Thus, the reversible proton accepting capability of the redox-active porphyrin-decorated PT-COF could allow for use as an energy storage material as a supercapacitor under acidic conditions. A high power density of 7.3 kW kg-1 was observed at a high scan rate, which outperforms most of the other COF-based electrode materials used for high storage performance. © 2021 American Chemical Society.

Item Type: Journal Article
Publication: Chemistry of Materials
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to American Chemical Society
Keywords: Condensation reactions; Crystallinity; Energy storage; Ethylene; Porphyrins; Storage (materials); Supercapacitor, Building blockes; Covalent organic frameworks; Lattice-based; Material science; Organics; Performance; Periodic ordering; Square lattices; Tetrakis; Two dimensional (2D) structure, Redox reactions
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 18 Nov 2021 10:56
Last Modified: 18 Nov 2021 10:56
URI: http://eprints.iisc.ac.in/id/eprint/70574

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