Journal
JOURNAL OF POWER SOURCES
Volume 466, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228294
Keywords
SILAR method; High surface area; High capacitance; Battery-like behavior; Asymmetric device
Funding
- Chemistry Department, Faculty of Science, Cairo University
- Egyptian Petroleum Research Institute
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Developing new, cost-effective and high-specific-capacitance electroactive materials is the main focus of current energy storage research. Herein, we report on successful one-step fabrication of binder-free nickel-zinc-iron layered double hydroxide (Ni-Zn-Fe LDH) using the successive ionic layer adsorption and reaction (SILAR) method. Energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), N-2 adsorption/desorption, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) techniques are employed to characterize the as-prepared Ni-Zn-Fe LDH. The electrochemical performance of Ni-Zn-Fe LDH is executed by cyclic voltammetry (CV), galvanostatic charging/discharging (GCD) and electrochemical impedance spectroscopy (EIS) in 6 M KOH electrolyte. Ni-Zn-Fe LDH demonstrates high specific capacitance (1452.3 F/g) at 5 mV/s and excellent cycling stability. This can be attributed to its high specific surface area (119.79 m(2)/g) and mesoporous structure with a pore size of similar to 3.69 nm, that allow for the electrolyte ions to get in contact with the electroactive material surface to a great extent. High energy density (14.9 Wh/kg), high power density (1077.6 W/kg) and outstanding cycling stability (similar to 95% capacitance retention after 1000 GCD cycles at 1.5 A/g) are obtained from the assembled asymmetric device (AC // Ni-Zn-Fe LDH). All these features make the proposed Ni-Zn-Fe LDH material a promising candidate for supercapacitor applications.
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