Li Li, Xie Fengting, Wu Heyu, Zhu Yuanyuan, Zhang Pinghua, Li Yanjiang, Li Hengzheng, Zhao Litao, Zhu Guang
Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Suzhou 234000, China.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics Chinese Academy of Sciences, Dalian 116023, China.
Molecules. 2023 Jul 30;28(15):5751. doi: 10.3390/molecules28155751.
Exploring anode materials with an excellent electrochemical performance is of great significance for supercapacitor applications. In this work, a N-doped-carbon-nanofiber (NCNF)-supported FeC/FeO nanoparticle (NCFCO) composite was synthesized via the facile carbonizing and subsequent annealing of electrospinning nanofibers containing an Fe source. In the hybrid structure, the porous carbon nanofibers used as a substrate could provide fast electron and ion transport for the Faradic reactions of FeC/FeO during charge-discharge cycling. The as-obtained NCFCO yields a high specific capacitance of 590.1 F g at 2 A g, superior to that of NCNF-supported FeC nanoparticles (NCFC, 261.7 F g), and NCNFs/FeO (NCFO, 398.3 F g). The asymmetric supercapacitor, which was assembled using the NCFCO anode and activated carbon cathode, delivered a large energy density of 14.2 Wh kg at 800 W kg. Additionally, it demonstrated an impressive capacitance retention of 96.7%, even after 10,000 cycles. The superior electrochemical performance can be ascribed to the synergistic contributions of NCNF and FeC/FeO.
探索具有优异电化学性能的阳极材料对于超级电容器的应用具有重要意义。在这项工作中，通过对含Fe源的静电纺丝纳米纤维进行简单碳化和后续退火，合成了一种N掺杂碳纳米纤维（NCNF）负载的FeC/FeO纳米颗粒（NCFCO）复合材料。在这种混合结构中，用作基底的多孔碳纳米纤维可为充放电循环过程中FeC/FeO的法拉第反应提供快速的电子和离子传输。所制备的NCFCO在2 A g时具有590.1 F g的高比电容，优于NCNF负载的FeC纳米颗粒（NCFC，261.7 F g）和NCNFs/FeO（NCFO，398.3 F g）。使用NCFCO阳极和活性炭阴极组装的不对称超级电容器在800 W kg时具有14.2 Wh kg的高能量密度。此外，即使经过10000次循环，它仍表现出令人印象深刻的96.7%的电容保持率。优异的电化学性能可归因于NCNF和FeC/FeO的协同作用。
