کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6466506 | 1422966 | 2017 | 13 صفحه PDF | دانلود رایگان |
- Chemical blowing synthesized N-doped porous graphitized carbon sheets (N-PGCNS).
- This strategy is cost-efficient, facile and industrial-scale than other synthesis routes.
- N-PGCNS own sheet-like morphology, developed porosity, highly graphitized framework.
- It exhibits a high capacitance of 337.6Â FÂ gâ1 at 0.5Â AÂ gâ1 and superior rate capacity.
- It shows an excellent energy/power density for symmetric cell in 1Â M TEABF4/AN.
Herein, we proposed a cost-efficient strategy to prepare nitrogen-doped porous graphitized carbon nanosheets, i.e. urea-assisted chemical blowing via foaming starch into the bubble networks of starch-derived polymers combining catalytic graphitization and subsequent KOH activation. In this synthesis route, starch acts as carbon precursor and foaming agent to build a bubble network of polymer, urea acts as nitrogen source and blowing agent to further blow bubble to form N-doped sheet-like carbons with ultrathin structure, γ-Fe2O3 serves as a graphitization catalyst precursor to generate highly graphitized framework. Importantly, the thickness of sheets, the nitrogen content and the graphitization degree can be simply tuned by adjusting the mass ratio of urea/γ-Fe2O3/KOH. The optimal sample exhibited uniform sheet-like morphology with a thickness of â¼80 nm, a high surface area of 2129.8 m2 gâ1, and a large pore volume of 0.97 cm3 gâ1. Acting as an electrode for supercapacitor in 6 M KOH electrolyte, it presented a high specific capacitance of 337.6 F gâ1 at 0.5 A gâ1. Moreover, the two-electrode symmetric cell was assembled in 1 M TEABF4/AN, and displayed a high energy density of 27.5 Wh kgâ1 as well as an excellent cycling stability with 87.6% retention after 5000 cycles.
Journal: Chemical Engineering Journal - Volume 312, 15 March 2017, Pages 191-203