Liu Jinghua, He Xiong, Cai Jiayang, Zhou Jie, Liu Baosheng, Zhang Shaohui, Sun Zijun, Su Pingping, Qu Dezhi, Li Yudong
Liuzhou Key Laboratory of New Energy Vehicle Power Lithium Battery, Guangxi Engineering Research Center for Characteristic Metallic Powder Materials, School of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou 545000, China.
Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.
Polymers (Basel). 2023 Aug 28;15(17):3565. doi: 10.3390/polym15173565.
Three-dimensional porous carbon materials with moderate heteroatom-doping have been extensively investigated as promising electrode materials for energy storage. In this study, we fabricated a 3D cross-linked chitosan-dicyandiamide-VOSO hydrogel using a polymerization process. After pyrolysis at high temperature, 3D porous VO/N-doped carbon nanosheet hybrids (3D VNCN) were obtained. The unique 3D porous skeleton, abundant doping elements, and presence of VO 3D VNCN pyrolyzed at 800 °C (3D VNCN-800) ensured excellent electrochemical performance. The 3D VNCN-800 electrode exhibits a maximum specific capacitance of 408.1 F·g at 1 A·g current density and an admirable cycling stability with 96.8% capacitance retention after 5000 cycles. Moreover, an assembled symmetrical supercapacitor based on the 3D VNCN-800 electrode delivers a maximum energy density of 15.6 Wh·Kg at a power density of 600 W·Kg. Our study demonstrates a potential guideline for the fabrication of porous carbon materials with 3D structure and abundant heteroatom-doping.
具有适度杂原子掺杂的三维多孔碳材料作为有前景的储能电极材料已被广泛研究。在本研究中，我们通过聚合过程制备了一种三维交联的壳聚糖-双氰胺-VOSO水凝胶。在高温热解后，获得了三维多孔VO/N掺杂碳纳米片杂化物（3D VNCN）。独特的三维多孔骨架、丰富的掺杂元素以及在800℃热解的VO 3D VNCN（3D VNCN-800）的存在确保了优异的电化学性能。3D VNCN-800电极在1 A·g电流密度下表现出408.1 F·g的最大比电容以及令人钦佩的循环稳定性，在5000次循环后电容保持率为96.8%。此外，基于3D VNCN-800电极组装的对称超级电容器在600 W·Kg的功率密度下提供15.6 Wh·Kg的最大能量密度。我们的研究为制备具有三维结构和丰富杂原子掺杂的多孔碳材料提供了潜在的指导方针。
