Abstract
We report the direct synthesis of ZnCo2O4 and ZnO/ZnCo2O4 submicron rod arrays grown on Ni foil current collectors via an ammonia-evaporation-induced method by controlling the ratio of Zn to Co. These three-dimensional (3D) hierarchical self-supported nanostructures are composed of one-dimensional (1D) ZnCo2O4 rods and two-dimensional (2D) ZnO nanosheet bands perpendicular to the axis of the each ZnCo2O4 rod. We carefully deal with the heteroepitaxial growth mechanisms of hexagonal ZnO nanosheets from a crystallographic point of view. Furthermore, we demonstrate the ability of these high-surface-area ZnO/ZnCo2O4 heterostructured rods to enable improved electrolyte permeability and Li ion transfer, thereby enhancing their Li storage capability (∼900 mA·h·g-1 at a rate of 45 mA·h·g-1) for Li ion battery electrodes. [Figure not available: see fulltext.]
| Original language | English |
|---|---|
| Pages (from-to) | 348-355 |
| Number of pages | 8 |
| Journal | Nano Research |
| Volume | 6 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2013 May |
| Externally published | Yes |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2012-0008669 (RIAM), 2009-0094046, 2012M1A2A2671802, and 2012R1A2A2A01045382). This work was also supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Education, Science and Technology, Korea (0420-20110156).
Keywords
- Li ion battery
- ZnO nanosheets
- ammonia-evaporation-induced method
- heterostructure
- hierarchical
ASJC Scopus subject areas
- General Materials Science
- Electrical and Electronic Engineering