Understanding the role of Co 3 O 4 on stability between active hierarchies and scaffolds: An insight into NiMoO 4 composites for supercapacitors
| Autor: | Xiaojun Pan, Jian Li, Erqing Xie, Wenbin Fu, Xiangwen Ma, Yuanyuan Zhao, Jinyuan Zhou, Peng Zhang, Xiaojuan Zhang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Sonication High capacitance General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Capacitance 0104 chemical sciences Surfaces Coatings and Films Mechanical stability Electrode Composite material 0210 nano-technology Current density Nanosheet |
| Zdroj: | Applied Surface Science. 416:160-167 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.04.171 |
| Popis: | It is often reported that pseudocapacitive electrodes' mechanical stability seriously limited their cycling performances in supercapacitors due to their quick fall off the electrode matrix during frequent fast charge/discharge process. In this work, we have demonstrated the mechanical enhancement in hierarchical NiMoO4 nanosheet arrays (NSAs) on free-standing substrates after introducing Co3O4 hierarchies. Under sonication vibration environment, the mechanical stability of Co3O4@NiMoO4 NSAs was enhanced by similar to 70% compared to that of the pure NiMoO4 ones. Moreover, the Co3O4@ NiMoO4 NSAs can display a high specific capacitance of 1476 F g(-1) at the current density of 1 A g(-1), and an excellent rate capability (keeping 81% at 20 A g(-1)). And after 2000 cycles, high capacitance retention of 96% was achieved for the Co3O4@ NiMoO4 core/ shell NSAs, while only 70% for the pure NiMoO4 ones. (C) 2017 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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