Jayababu Nagabandi, Jo Seungju, Kim Youngsu, Kim Daewon
Department of Electronic Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, Republic of Korea.
Department of Electronic Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, Republic of Korea.
Ultrason Sonochem. 2021 Mar;71:105374. doi: 10.1016/j.ultsonch.2020.105374. Epub 2020 Oct 22.
Supercapacitor (SC) electrodes fabricated with the combination of carbon nanotubes (CNTs) and metal oxides are showing remarkable advancements in the electrochemical properties. Herein, NiO decorated CNT/ZnO core-shell hybrid nanocomposites (CNT/ZnO/NiO HNCs) are facilely synthesized by a two-step solution-based technique for the utilization in hybrid supercapacitors. Benefitting from the synergistic advantages of three materials, the CNT/ZnO/NiO HNCs based electrode has evinced superior areal capacity of ~67 µAh cm at a current density of 3 mA cm with an exceptional cycling stability of 112% even after 3000 cycles of continuous operation. Highly conductive CNTs and electrochemically active ZnO contribute to the performance enhancement. Moreover, the decoration of NiO on the surface of CNT/ZnO core-shell increases the electro active sites and stimulates the faster redox reactions which play a vital role in augmenting the electrochemical properties. Making the use of high areal capacity and ultra-long stability, a hybrid supercapacitor (HSC) was assembled with CNT/ZnO/NiO HNCs coated nickel foam (CNT/ZnO/NiO HNCs/NF) as positive electrode and CNTs coated NF as negative electrode. The fabricated HSC delivered an areal capacitance of 287 mF cm with high areal energy density (67 µWh cm) and power density (16.25 mW cm). The combination of battery type CNT/ZnO/NiO HNCs/NF and EDLC type CNT/NF helped in holding the capacity for a long period of time. Thus, the systematic assembly of CNTs and ZnO along with the NiO decoration enlarges the application window with its high rate electrochemical properties.
由碳纳米管（CNTs）和金属氧化物组合制成的超级电容器（SC）电极在电化学性能方面展现出显著进展。在此，通过两步溶液法简便合成了用于混合超级电容器的NiO修饰的CNT/ZnO核壳杂化纳米复合材料（CNT/ZnO/NiO HNCs）。受益于三种材料的协同优势，基于CNT/ZnO/NiO HNCs的电极在3 mA cm的电流密度下表现出约67 µAh cm的优异面积容量，即使在连续运行3000次循环后仍具有112%的出色循环稳定性。高导电性的CNTs和具有电化学活性的ZnO有助于性能提升。此外，在CNT/ZnO核壳表面修饰NiO增加了电活性位点并促进了更快的氧化还原反应，这对增强电化学性能起着至关重要的作用。利用高面积容量和超长稳定性，以涂覆有CNT/ZnO/NiO HNCs的泡沫镍（CNT/ZnO/NiO HNCs/NF）作为正极，涂覆有CNTs的泡沫镍作为负极，组装了一个混合超级电容器（HSC）。所制备的HSC具有287 mF cm的面积电容、高面积能量密度（67 µWh cm）和功率密度（16.25 mW cm）。电池型CNT/ZnO/NiO HNCs/NF和双电层电容器型CNT/NF的组合有助于长时间保持容量。因此，CNTs、ZnO与NiO修饰的系统组装通过其高倍率电化学性能扩大了应用范围。
