Facile Synthesis of Nickel Cobalt Layered Double Hydroxide Nanosheets Intercalated with Sulfate Anion for High-Performance Supercapacitor
Nickel-cobalt layered double hydroxide nanosheets intercalated with sulfate anion were fabricated via a facile hydrothermal method and investigated as high-performance electrode materials for supercapacitors. The morphology and electrochemical properties of the obtained samples could
be controlled by changing molar ratios of the Ni and Co precursors. NiCo-LDHs with Ni/Co molar ratio of 0.35:0.65 exhibited high specific capacitance of 1551.1 F/g at the current density of 1 A/g and good cycling stability of 84.0% retention after 1000 charge/discharge cycles. On this basic,
aqueous asymmetric supercapacitor (AAS) was successfully constructed by using the Ni0.35Co0.65-LDHs as the positive electrode and the activated carbon as the negative electrode. The as-built AAS was able to work in a working voltage window of 0~1.4 V and exhibited outstanding
electrochemical performance. The Ni0.35Co0.65-LDHs//KOH activated cotton-derived carbon (ACDC) AAS showed the highest specific capacitance of 157.5 F/g, the satisfactory capacitance retention of 78.62% after 5000 cycles, the maximum energy density of 42.88 Wh/kg, and
preferable combination of energy density of 30.63 Wh/kg with power density of 4.9 kW/kg at a current density of 7 A/g.
Keywords: Asymmetric Supercapacitor; Electrochemical Properties; Hydrothermal Method; NiCo Layered Double Hydroxides
Document Type: Research Article
Affiliations: Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, Department of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
Publication date: 01 February 2020
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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