Ultrathin NiFe-layered double hydroxide decorated NiCo2O4 arrays with enhanced performance for supercapacitors
| Autor: | Yong Chen, Jinchun Tu, Zheng Liu, Junlei Qi, Yang Cao, Shujiang Ding, Haixing Gao, Mingliang Guo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Nanostructure Materials science Shell (structure) Nanowire General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Capacitance 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Chemical engineering chemistry Electrode Hydroxide 0210 nano-technology |
| Zdroj: | Applied Surface Science. 465:929-936 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2018.09.180 |
| Popis: | Designing and synthesizing core/shell nanostructures materials as binder-free electrodes is an effective strategy to enhance the electrochemical performance of supercapacitors. In this work, the hierarchical NiCo2O4@NiFe-layered double hydroxide core/shell arrays are successfully constructed via a stepwise hydrothermally grow method and investigated for application in supercapacitors. With the assistance of the hierarchical core/shell structures and the synergetic effect between NiCo2O4 and NiFe-layered double hydroxide nanosheets, the hybrid electrode discloses significant melioration in property, including the improvement in number of the electrochemically active sites and short transport path lengths for both electrons and ions. Thus, the core/shell electrode exhibits remarkable electrochemical performance, such as a high areal capacity (12.3 F cm−2) and good cycling stability (83.1% capacitance retention after 2000 cycles). Our trials testify that the hierarchical NiCo2O4@NiFe-layered double hydroxide core/shell nanowire arrays are advantageous for potential applications in energy storage devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect