One-step synthesis of N, S-codoped porous graphitic carbon derived from lotus leaves for high-performance supercapacitors
The development of high-performance biomass-derived porous graphitic carbon materials is in high demand for applications in supercapacitors. Herein, a novel N, S self-codoped porous graphitic carbon is synthesized by one-step carbonization of lotus leaves together with urea and ferric chloride. Due to the combination of urea as a nitrogen doping agent and ferric chloride as both activating agent and graphitization catalyst, the obtained lotus leaf–derived porous graphitic carbon material possesses a high specific surface area of 975.7 m2 g−1, appropriate pore structure with interconnected macropores, suitable graphitization level, and high N, S contents. The resultant porous graphitic carbon electrode shows a high specific capacitance of 385.0 F g−1 at 0.5 A g−1 (based on a three-electrode system in 6 M KOH electrolyte), and good rate capability (140.0 F g−1 at 100 A g−1). Furthermore, the assembled carbon-based symmetric supercapacitor delivers a high energy density of 29.5 Wh kg−1 at a power density of 545.6 W kg−1 and excellent long-term cycling stability (95.3% of the initial capacitance after 20,000 cycles at 5 A g−1). This work provides a general method to synthesize porous graphitic carbon from biomass for electrochemical energy storage and conversion.
KeywordsPorous graphitic carbon Lotus leaves Nitrogen Sulfur codoped Supercapacitor
This work was financially supported by the Hubei Province Education Scientific Research Project (D20182903 and Q20182902).
- 26.Lai F, Miao YE, Zuo L, Lu H, Huang Y, Liu T (2016) Biomass-derived nitrogen-doped carbon nanofiber network: a facile template for decoration of ultrathin nickel-cobalt layered double hydroxide nanosheets as high-performance asymmetric supercapacitor electrode. Small 12:3235–3244CrossRefGoogle Scholar
- 29.Estevez L, Prabhakaran V, Garcia AL, Shin Y, Tao J, Schwarz AM, Darsell J, Bhattacharya P, Shutthanandan V, Zhang JG (2017) Hierarchically porous graphitic carbon with simultaneously high surface area and colossal pore volume engineered via ice templating. ACS Nano 11:11047–11055CrossRefGoogle Scholar