将玉米芯转化为用于超级电容器应用的活性多孔碳。

Yang Shaoran, Zhang Kaili

Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.

Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China.

Nanomaterials (Basel). 2018 Mar 21;8(4):181. doi: 10.3390/nano8040181.

Carbon materials derived from biomass are promising electrode materials for supercapacitor application due to their specific porosity, low cost and electrochemical stability. Herein, a hierarchical porous carbon derived from corncob was developed for use as electrodes. Benefitting from its hierarchical porosity, inherited from the natural structure of corncob, high BET surface area (1471.4 m²·g) and excellent electrical conductivity, the novel carbon material exhibited a specific capacitance of 293 F·g at 1 A·g in 6 M KOH electrolyte and maintained at 195 F·g at 5 A·g. In addition, a two-electrode device was assembled and delivered an energy density of 20.15 Wh·kg at a power density of 500 W·kg and an outstanding stability of 99.9% capacitance retention after 4000 cycles.

源自生物质的碳材料因其特定的孔隙率、低成本和电化学稳定性，是用于超级电容器应用的有前景的电极材料。在此，开发了一种源自玉米芯的分级多孔碳用作电极。受益于其从玉米芯天然结构继承而来的分级孔隙率、高比表面积（1471.4 m²·g）和优异的导电性，这种新型碳材料在6 M KOH电解液中1 A·g时的比电容为293 F·g，在5 A·g时保持在195 F·g。此外，组装了一个两电极装置，在功率密度为500 W·kg时能量密度为20.15 Wh·kg，在4000次循环后电容保持率高达99.9%，具有出色的稳定性。