Journal
DIAMOND AND RELATED MATERIALS
Volume 138, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2023.110258
Keywords
B; N co -doping; Resin-derived carbon; Supercapacitors; Energy storage and conversion
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In this study, B, N co-doped porous carbon materials (PRNB) were synthesized through a two-step carbonization process using self-made phenolic resin. Urea, boric acid, and potassium oxalate were used as heteroatom dopants and activator, respectively. The co-doping of boron and nitrogen and the addition of potassium oxalate resulted in a unique electronic structure, high specific capacitance, excellent rate performance, and stability of the PRNB material. The symmetric electrode based on PRNB achieved a high energy density, providing a novel approach for improving the electrochemical performance of resin-derived carbon.
In this study, we present the synthesis of porous carbon materials designated as B, N co-doped porous carbon materials (PRNB), co-doped with boron and nitrogen through a two-step carbonization process of self-made phenolic resin. Among them, urea, boric acid, and potassium oxalate were used as the heteroatom dopants and activator, respectively. The co-doping of boron and nitrogen induced a unique electronic structure, resulting in improved capacitance performance compared to single-doped materials. Moreover, the addition of potassium oxalate as an activator facilitated the etching of the carbon framework during pyrolysis. Owing to the co-doping effect of boron and nitrogen and the abundant micropores, the PRNB material exhibited a remarkably high specific capacitance of 330 F g-1 at 1 A g-1. It also displayed excellent rate performance (70 %) and stability, with only a 6 % loss after 10,000 cycles compared to other materials. The symmetric electrode based on PRNB achieved an energy density of up to 29.7 Wh kg-1 in a neutral electrolyte, which provides a novel approach for resin-derived carbon to improve electrochemical performance.
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