Nitrogen-Doped Hierarchical Porous Carbon from Wheat Straw for Supercapacitors

By Wei Liu, Jie Mei, Guolong Liu, Q. Kou, Tingfeng Yi, S. Xiao. ACS Sustainable Chemistry and Engineering, 2018

148 citations recorded by the source corpus.

In this paper, wheat straw was converted into nitrogen-doped hierarchical porous carbon (N-HC) by direct pyrolysis of wheat straw with CaCl2 as an activator and melamine as a nitrogen resource. The as-prepared samples exhibit different hierarchical porous structures and nitrogen contents in a temperature range from 600 to 800 °C. Compared with other samples, the N-HC-800 displays a large amount of micropores, uniform mesopores, a high specific surface area (892 m2 g–1), and moderate nitrogen doping (5.63 wt %). Therefore, the N-HC-800-based supercapacitor exhibits a high specific capacitance of 275 F g–1 at a current density of 0.2 A g–1, a high capacitance retention ratio of 81% even at 8 A g–1, and an excellent cycling stability (over 97% retention rate after 10 000 cycles) in 6 M KOH solution. This work not only proposes a novel routine for the development of porous carbon materials for supercapacitor but also provides a new option for the processing of waste wheat straw instead of being burned in rura...

Subfields: Biomaterials, Electronic, Optical and Magnetic Materials, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/abfedc3d7d333d1b20f3e93171aa5ff4d2e1bdad