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Preparation of nitrogen-doped porous carbons for high-performance supercapacitor using biomass of waste lotus stems
- Yan, Song, Lin, Jingjing, Liu, Ping, Zhao, Zhicheng, Lian, Jun, Chang, Wei, Yao, Lu, Liu, Yueran, Lin, Hualin, Han, Sheng
- RSC advances 2018 v.8 no.13 pp. 6806-6813
- X-ray photoelectron spectroscopy, activated carbon, biomass, capacitance, electrochemistry, nitrogen, pyridines, stems, surface area, total nitrogen, wastes
- In this study, advanced nitrogen-doped porous carbon materials for supercapacitor was prepared using low-cost and environmentally friendly waste lotus stems (denoted as LS-NCs). Nitrogen in the surface functionalities of LS-NCs was investigated using X-ray photoelectron spectroscopy analysis. The sum of pyridine nitrogen (N-6) and pyrrolic/pyridinic (N-5) contents accounted for 94.7% of the total nitrogen and significantly contributed to conductivity. Pore structure and surface area of activated carbons were measured using the Brunauer–Emmett–Teller method. A maximum specific surface area of 1322 m² g⁻¹ was achieved for LS-NCs. The porous carbons exhibited excellent electrochemical properties with a specific capacitance of 360.5 F g⁻¹ at a current density of 0.5 A g⁻¹ and excellent cycling stability (96% specific capacitance retention after 5000 cycles). The above findings indicate that taking advantage of the unique structure of abundant waste lotus stem provides a low-cost and feasible design for high-performance supercapacitors.