State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi׳an 710072, China.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi׳an 710072, China.
J Colloid Interface Sci. 2018 Nov 15;530:233-242. doi: 10.1016/j.jcis.2018.06.077. Epub 2018 Jun 27.
Coupling Co-Ni bimetallic oxides with carbon nanotubes (CNTs) is recognized an effective strategy to enhance the performance of supercapacitors. In this work, porous NiCoO/CNTs nanocomposites are prepared through in situ growth of ZIF-67 precursor onto CNTs followed by subsequent annealing. The obtained NiCoO/CNTs combine the promising high storage performance of porous NiCoO with the excellent conductivity of CNTs. When test in three-electrode system, the electrode materials exhibit a high specific capacitance of 668 F/g at 1 A g, a good rate capability of 91.60% retention from 1 to 10 A g and good cycling stability of 91.20% retention after 3500 cycles in 2.0 M KOH electrolyte. Furthermore, the NiCoO/CNTs are tested in two-electrode configuration, showing a high energy density of 23.56 Wh kg at power density of 800.15 W kg and outstanding cycling stability of 93.75% retention after 3000 cycles. The excellent electrochemical performance of the designed nanomaterials can be ascribed to the synergy between the CNTs and NiCoO.
将 Co-Ni 双金属氧化物与碳纳米管 (CNTs) 耦合被认为是提高超级电容器性能的有效策略。在这项工作中，通过将 ZIF-67 前体原位生长到 CNTs 上，然后进行后续退火，制备了多孔 NiCoO/CNTs 纳米复合材料。所获得的 NiCoO/CNTs 结合了多孔 NiCoO 的高存储性能和 CNTs 的优异导电性。在三电极系统中进行测试时，该电极材料在 1 A/g 时表现出 668 F/g 的高比电容，在 1 至 10 A/g 时具有良好的倍率性能，在 2.0 M KOH 电解质中循环 3500 次后保持 91.20%的循环稳定性。此外，将 NiCoO/CNTs 用于两电极配置，在 800.15 W/kg 的功率密度下表现出 23.56 Wh/kg 的高能量密度和 3000 次循环后 93.75%的出色循环稳定性。设计的纳米材料具有优异的电化学性能，可归因于 CNTs 和 NiCoO 之间的协同作用。
