School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China.
Int J Biol Macromol. 2020 Dec 1;164:4095-4103. doi: 10.1016/j.ijbiomac.2020.09.011. Epub 2020 Sep 5.
The development of porous carbon materials from sustainable natural sources is an attractive topic in the field of energy storage materials. This study proposed the production of nitrogen-doped porous carbon (NPC) materials from the renewable cellulose nanocrystal (CNC) as carbon source and water-soluble urea as nitrogen source without any external activation. The liquid compounding treatment and subsequent carbonization provided the NPC materials a uniform and stable N-doping (7.4% nitrogen content), high specific surface area (366.5 m/g) and various superior electrochemical properties. The fabricated NPC sample (CU-3, with the weight ratio of 1:10 for CNC and urea) exhibited a high specific capacitance of 570.6 F/g at a current density load of 1 A/g and good cycling stability (91.2% capacitance retention after 1000 cycles at a current density of 10 A/g) in the 6 M KOH electrolyte. Applying this NPC material as the electrode component in the assembled symmetric supercapacitor demonstrated the promising electrochemical stability with the specific capacitances of 88.2 F/g at the current density of 1 A/g and capacitance retention of 99.8% after 5000 cycles. The developed N-doped porous carbon material from CNCs and urea is expected to be a sustainable electrode component for the supercapacitor materials.
从可持续的天然资源中开发多孔碳材料是储能材料领域中一个很有吸引力的课题。本研究提出了一种以可再生纤维素纳米晶体（CNC）为碳源，水溶性尿素为氮源，无需任何外部活化剂，制备氮掺杂多孔碳（NPC）材料的方法。液体复合处理和随后的碳化过程使 NPC 材料具有均匀稳定的 N 掺杂（氮含量为 7.4%）、高比表面积（366.5 m/g）和各种优异的电化学性能。所制备的 NPC 样品（CNC 和尿素的重量比为 1:10 的 CU-3）在 6 M KOH 电解液中，在电流密度为 1 A/g 时具有 570.6 F/g 的高比电容，在 10 A/g 的电流密度下循环 1000 次后具有 91.2%的电容保持率，表现出良好的循环稳定性。将这种 NPC 材料作为组装的对称超级电容器中的电极组件，在电流密度为 1 A/g 时具有 88.2 F/g 的比电容，经过 5000 次循环后电容保持率为 99.8%，表现出良好的电化学稳定性。这种由 CNC 和尿素制备的氮掺杂多孔碳材料有望成为超级电容器材料的可持续电极组件。
