Nitrogen-rich Porous Carbon Derived from Biomass as High Performance Electrode Materials for Supercapacitors

摘要

In situ nitrogen doped porous carbon materials (NC) has been architectured vis hydrothermal -carbonization coupling method by the nitrogen-rich biomass, black garlic (BG). The resulting NCperforms a high specific surface area, above 2000 m2 g?1 with abundant mesoporous and microporoushierarchical structure, as well as a high graphitization degree demonstrated by XRD and Raman.Further electrochemical measurements revealed that the corresponding electrode prepared by these NCcan lead to a significantly high specific capacitance of 331 F g?1 in a 6 M KOH aqueous electrolyte,which is higher than other porous carbon materials obtained by most biomass. Furthermore, thecorresponding electrode shows a high degree of cycling stability. This contribution shows that the NCderived from nitrogen-rich biomass are more environmental-friendly and less energy consuming thanthat of nitrogen doped carbon materials obtained from other conventional methods. Also, the effect ofhydrothermal treatment has been discussed relative to the conventional one-step carbonization.