Pal M, Pal P, Nandi M. B/N-Codoped Porous Carbons as Metal-Free and Binder-Free Electrode Material for Supercapacitors.
Chemistry 2025:e202500800. [PMID:
40351145 DOI:
10.1002/chem.202500800]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2025] [Revised: 04/25/2025] [Accepted: 05/07/2025] [Indexed: 05/14/2025]
Abstract
A facile, cost-effective, and eco-friendly approach for the synthesis of B/N-codoped porous carbon materials has been developed for metal-free and binder-free supercapacitors. A set of samples, CPFD-B/N-5, CPFD-B/N-10, and CPFD-B/N-15 have been synthesized by carbonization of a phloroglucinol-formaldehyde-dopamine (PFD) polymer and tetraethyl orthosilicate (TEOS). Boric acid has been used to introduce different amounts of boron and an undoped sample, CPFD-N, has been synthesized for comparison. The CPFD materials function as binder-free electrodes and display excellent electrochemical behavior. The optimization of boron as a heteroatom with a rational distribution of pores enables CPFD-B/N-10 electrode to achieve a high capacitance of 962 F/g at a current density of 1 A/g in 1 M H2SO4 electrolyte. It demonstrates excellent rate capability and exceptional cycling stability, retaining over 120% of its capacitance after 5000 cycles at a current density of 30 A/g. It has a specific energy density of 108.22 Wh/kg and a power output of 450.00 W/kg at 1 A/g, effectively bridging the gap between supercapacitors and batteries. A solid-state symmetric supercapacitor made from the material achieves a capacitance of 622 F/g at a current density of 1 A/g, Coulombic efficiency of 89% after 1,500 cycles and powers a 3 V LED bulb.
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