Bai Qiuhong, Li Huimin, Zhang Luwei, Li Cong, Shen Yehua, Uyama Hiroshi
Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, College of Chemistry and Materials Science, National Demonstration Center for Experimental Chemistry Education, Northwest University, Xi'an 710127, China.
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan.
ACS Appl Mater Interfaces. 2020 Dec 16;12(50):55913-55925. doi: 10.1021/acsami.0c16752. Epub 2020 Dec 3.
Energy shortage and wasting of resources are two main challenges for human society. To solve these problems, nitrogen-doped porous carbon was synthesized through a simple thermally induced phase separation (TIPS) method with subsequent carbonization and activation with biomass konjac/polyacrylonitrile composites as the raw materials and nitrogen source for the first time. The obtained composite carbon with hierarchical porosity, large specific surface areas, and high content of nitrogen doping shows promise due to its desirable electrochemical performance. Nitrogen-doped porous carbon exhibits a high specific capacitance of 390 F g in a three-electrode system and a good rate characteristic with 70% capacitance retention at 20 A g. Excellent stabilization was observed with only a 4.5% capacitance decay under 10 000 cycles at 5 A g. The practical application of the composite porous carbon on flexible symmetrical supercapacitors was evaluated, showing a maximum energy density of 9.0 W h kg when the power density was 250.2 W kg. More importantly, the fabricated flexible supercapacitor could still keep an excellent supercapacitor performance under bending and shows only a slight capacitance loss of 9% even after 1000 cycles (180°) of repetitive bending. The current study promotes the development of nitrogen-doped carbon materials on flexible energy storage devices.
能源短缺和资源浪费是人类社会面临的两大主要挑战。为了解决这些问题，首次以生物质魔芋/聚丙烯腈复合材料为原料和氮源，通过简单的热诱导相分离（TIPS）方法，随后进行碳化和活化，合成了氮掺杂多孔碳。所制备的具有分级孔隙率、大比表面积和高氮掺杂含量的复合碳，因其理想的电化学性能而展现出应用前景。氮掺杂多孔碳在三电极体系中表现出390 F g的高比电容和良好的倍率特性，在20 A g时电容保持率为70%。在5 A g下10000次循环中，仅观察到4.5%的电容衰减，具有优异的稳定性。评估了复合多孔碳在柔性对称超级电容器上的实际应用，当功率密度为250.2 W kg时，最大能量密度为9.0 W h kg。更重要的是，所制备的柔性超级电容器在弯曲状态下仍能保持优异的超级电容器性能，即使在1000次（180°）重复弯曲后，电容损失也仅为轻微的9%。当前的研究推动了氮掺杂碳材料在柔性能源存储器件方面的发展。
