Highly Stable and Crystalline Covalent Organic Framework Capable for a High-Performance Electrical Double-Layer Supercapacitor
Supercapacitors (SCs) are strong candidates for electrical energy storage. However, their widespread use is limited by their low energy storage density and relatively high effective series resistance. To advance the energy density without losing stability and power density, designing the superior electrode materials is critical. Covalent organic frameworks (COFs) have the enormous potential in this area, although the preparation of COFs for high performance SCs still remains a challenge. Considering the favorable structural features for electrical double-layer supercapacitors (EDLCs), we anticipated and prepared a state-of-the-art two-dimensional covalent organic framework (2D COF) with well-defined composition and molecular structure by solvothermal synthesis and heat treatment. This conjugated 2D COF has a continuous crystalline two-dimensional network with 1-nanometer-width pores, exhibiting high specific surface area of 2743 m 2 /g and excellent thermal stability (up to 1000 °C). Two-electrode double-layer supercapacitor cells fabricated with this 2D material yielded high values of gravimetric capacitance (258 F/g at 0.5 A/g), energy density (110 Wh/kg at 250 W/kg, 73.2 Wh/kg at 50 kW/kg), power density (up to 50 kW/kg) and stability (achieving 81% capacity retention at a current density of 2 A/g after 100,000 charge-discharge cycles) with ionic liquid electrolytes. This work provides an excellent active material for supercapacitors and highlights the association amongst the structure of electrode materials and the performance of supercapacitors and improve the application of COFs in SCs
Year of publication: |
[2022]
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Authors: | Iqbal, Rashid ; Saleem, Adil ; Majeed, Muhammad K. ; Ali, Sajjad ; Akbar, Abdul Rehman ; Naeem, M. Shahzaib ; Hussain, Arshad ; Rauf, Sajid ; Zhao, Wei |
Publisher: |
[S.l.] : SSRN |
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