An investigation of ultrathin nickel-iron layered double hydroxide nanosheets grown on nickel foam for high-performance supercapacitor electrodes
| Autor: | Yi Lu, Haimei Zheng, Kai-Yang Niu, Feng Lin, Fanming Meng, Liang Fang, Faling Ling, Baoshan Hu, Fang Wu, Bin Jiang |
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| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Mechanical Engineering Metals and Alloys chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance 0104 chemical sciences Nickel chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Electrode Pseudocapacitor Materials Chemistry Hydroxide 0210 nano-technology Nanosheet |
| Zdroj: | Journal of Alloys and Compounds. 714:63-70 |
| ISSN: | 0925-8388 |
| Popis: | Layered double hydroxide materials with sheet-like morphologies (i.e., LDH nanosheets) have been proposed to use in supercapacitors. However, the practical application of LDH nanosheets has been inhibited by the notorious inter-particle aggregation and poor charge transport between active materials and current collectors. In this work, 3D nickel-iron layered double hydroxide (NiFe-LDH) nanosheet films with porous nanostructures were synthesized using a hydrothermal method. The ultrathin nanosheets are homogeneously and vertically aligned on the surface of Ni foam. The pseudocapacitors assembled using NiFe-LDH nanosheets exhibit a superior specific capacitance of 2708 F g −1 at 5 A g −1 , higher than the previously reported LDHs. The effect of growth concentration and Ni/Fe mole ratio on the electrochemical properties was also investigated. Asymmetric supercapacitors with the NiFe-LDH nanosheets film as the positive electrode and active carbon as the negative electrode display a high energy density of 52 Wh kg −1 at an average power density of 800 W kg −1 . When two aqueous asymmetric supercapacitors were assembled in series and charged for only 1 min, the stored energy was capable of powering two green light-emitting-diodes for more than 5 min, indicating the great potential of these 3D NiFe-LDH nanosheets for high-performance energy storage. |
| Databáze: | OpenAIRE |
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