Zhang Xu, Fan Qiuyu, Qu Ning, Yang He, Wang Man, Liu Anmin, Yang Juan
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin 124221, China.
Nanoscale. 2019 Apr 25;11(17):8588-8596. doi: 10.1039/c9nr01290g.
Ultrathin 2D nitrogen-doped carbon nanosheets with a thickness of about 5 nm have been facilely synthesized from potato starch by using graphene oxides (GO) as the structure-directing agent. The pore structures and surface properties can be feasibly and rationally tailored by addition of a certain amount of GO in the precursor. The addition of GO to the potato starch can increase the surface areas and the pyridinic-N and pyrrolic-N ratios of the as-prepared 2D carbon nanosheets. The as-obtained ultrathin nitrogen-doped carbon nanosheets with the optimized amount of GO in potato starch (3 wt%) possess a unique 2D structure, a high N content, and high ratios of pyridinic-N and pyrrolic-N, exhibiting a high capacitance of 301 F g-1 at 0.5 A g-1, superior rate capability of 81% at 50 A g-1, and good cycling stability in 6 M KOH electrolyte. Experimental and theoretical results show that high pyridinic-N and pyrrolic-N ratios in the NCNSs are beneficial for improving the electrochemical performance. This work may provide helpful guidance for understanding the effect of the addition of GO to biomass precursors on the electrochemical performance of the 2D nitrogen-doped carbon electrodes for supercapacitors.
以氧化石墨烯（GO）为结构导向剂，已通过马铃薯淀粉简便地合成了厚度约为5nm的超薄二维氮掺杂碳纳米片。通过在前体中添加一定量的GO，可以合理且可行地调整孔结构和表面性质。向马铃薯淀粉中添加GO可以增加所制备的二维碳纳米片的表面积以及吡啶氮和吡咯氮的比例。在马铃薯淀粉中具有优化量的GO（3wt%）所获得的超薄氮掺杂碳纳米片具有独特的二维结构、高氮含量以及高比例的吡啶氮和吡咯氮，在0.5A g-1下表现出301F g-1的高电容、在50A g-1下81%的优异倍率性能以及在6M KOH电解液中的良好循环稳定性。实验和理论结果表明，NCNSs中高比例的吡啶氮和吡咯氮有利于改善电化学性能。这项工作可能为理解向生物质前体中添加GO对用于超级电容器的二维氮掺杂碳电极的电化学性能的影响提供有益指导。
