Liu Jinghua, He Xiong, Guo Fei, Liu Baosheng, Sun Zijun, Zhang Li, Chang Haixin
School of Microelectronics and Materials Engineering, Guangxi University of Science and Technology Liuzhou 545000 China.
Quantum-Nano Matter and Device Lab, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology Wuhan 430074 China.
RSC Adv. 2022 May 19;12(24):15354-15360. doi: 10.1039/d2ra02789e. eCollection 2022 May 17.
Owing to the wide negative potential window (∼1.2 V) along with high specific capacitance (1340 F g) in alkaline electrolyte, vanadium nitride (VN) has been served as promising negative supercapacitor electrode material. However, VN is easy to dissolve during cycling process and shows low capacitance retainability. Herein, a hybrid electrode (marked as VN/NCNT/NCN), featuring VN nanoparticles and N-doped carbon nanotube inserted in N-doped carbon nanosheets, has been fabricated with a facile CN self-sacrificing method. The porous structure and high conductive carbon skeleton, as well as the uniform distribution of VN nanoparticles give VN/NCNT/NCN a great amount of active site and fulfill excellent electrochemical performance for VN/NCNT/NCN-based electrode. The as-fabricated hybrid electrode exhibits a maximum specific capacitance of 232.9 F g at 1 A g. Moreover, the cycling performance has been greatly improved and the specific capacitance remains 91% after 5000 cycles.
由于在碱性电解质中具有较宽的负电位窗口（约1.2V）以及高比电容（1340F/g），氮化钒（VN）已成为一种有前景的负极超级电容器电极材料。然而，VN在循环过程中容易溶解，且电容保持率较低。在此，通过一种简便的CN自牺牲方法制备了一种混合电极（标记为VN/NCNT/NCN），其具有插入氮掺杂碳纳米片中的VN纳米颗粒和氮掺杂碳纳米管。多孔结构和高导电碳骨架，以及VN纳米颗粒的均匀分布，赋予VN/NCNT/NCN大量的活性位点，并使其基于VN/NCNT/NCN的电极具有优异的电化学性能。所制备的混合电极在1A/g时表现出232.9F/g的最大比电容。此外，循环性能得到了极大改善，在5000次循环后比电容仍保持91%。
