School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China.
School of Materials Science and Technology, Liaocheng University, Liaocheng, 252059, PR China.
J Colloid Interface Sci. 2019 Apr 15;542:400-409. doi: 10.1016/j.jcis.2019.02.024. Epub 2019 Feb 7.
Nitrogen-doped layered porous carbon has been successfully fabricated from the biomass of porcine bladders via carbonization and KOH activation. The effects of KOH dosage on the structure, composition and capacitive property of carbon were investigated by a variety of means (SEM, HRTEM, XRD, Raman, XPS, BET and electrochemical test). Owing to the unique layered structure and rich heteroatom content of porcine bladders, the sample obtained at a KOH/carbon mass ratio of 2 were endowed with appropriate pore structure, large specific surface area (1881.7 m g) and high nitrogen content (5.38%). Meanwhile, the sample exhibits the best electrochemical performance in 6 M KOH electrolyte, including high specific capacitance (322.5 F g at a current density of 0.5 A g), desirable rate capability (79% capacitance retention when current density increases from 0.5 to 10 A g) and superior cycling stability (96% capacitance retention after 5000 cycles). Furthermore, the symmetric supercapacitor assembled with this carbon electrode can deliver 10.9 Wh kg energy density at 0.15 kW kg power density, and maintain 95% capacitance after 5000 cycles. The prominent performance of this material suggests its promising application in supercapacitor electrode.
通过碳化和 KOH 活化，成功地从猪膀胱的生物质中制备出氮掺杂层状多孔碳。通过多种手段（SEM、HRTEM、XRD、拉曼、XPS、BET 和电化学测试）研究了 KOH 用量对碳的结构、组成和电容性能的影响。由于猪膀胱具有独特的层状结构和丰富的杂原子含量，在 KOH/碳质量比为 2 时获得的样品具有合适的孔结构、大的比表面积（1881.7 m g）和高的氮含量（5.38%）。同时，该样品在 6 M KOH 电解质中表现出最佳的电化学性能，包括高比电容（在 0.5 A g 的电流密度下为 322.5 F g）、良好的倍率性能（当电流密度从 0.5 增加到 10 A g 时，电容保持率为 79%）和优异的循环稳定性（在 5000 次循环后电容保持率为 96%）。此外，由这种碳电极组装的对称超级电容器在 0.15 kW kg 功率密度下可提供 10.9 Wh kg 的能量密度，并且在 5000 次循环后保持 95%的电容。该材料的突出性能表明其在超级电容器电极中具有广阔的应用前景。
