Journal
ULTRASONICS SONOCHEMISTRY
Volume 71, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2020.105374
Keywords
Ultrasonication; Hybrid supercapacitor; NiO decoration; Carbon nanotubes; ZnO; Core-shell nanostructures
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1A6A1A03025708]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF2018R1C1B5045747]
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The combination of carbon nanotubes (CNTs), zinc oxide (ZnO), and nickel oxide (NiO) in supercapacitor electrodes showed significant improvements in performance, enhancing areal capacity and cycling stability.
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 similar to 67 mu Ah cm(-2) at a current density of 3 mA cm(-2) 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(-2) with high areal energy density (67 mu Wh cm(-2)) and power density (16.25 mW cm(-2)). 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.
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