Article Title

Heteroepitaxial growth of ZnO nanosheet bands on ZnCo₂O₄ submicron rods toward high-performance Li ion battery electrodes

Authors

Chan Woo Lee, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Seung-Deok Seo, Department of Material Science and Engineering, Ajou University, Suwon 443-749, Korea
Dong Wook Kim, Department of Chemistry, Northwestern University, 245 Sheridan Road, Evanston, IL 60208, USA
Sangbaek Park, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Kyoungsuk Jin, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Dong-Wan Kim, Department of Material Science and Engineering, Ajou University, Suwon 443-749, Korea
Kug Sun Hong, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea

Keywords

ZnCo2O4 submicron rods, ZnO nanosheets, hierarchical heterostructure, ammonia-evaporationinduced method, Li ion battery

Abstract

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.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-013-0311-0

Publisher

Tsinghua University Press

Recommended Citation

Chan Woo Lee,Seung-Deok Seo,Dong Wook Kim,Sangbaek Park,Kyoungsuk Jin,Dong-Wan Kim,Kug Sun Hong, Heteroepitaxial growth of ZnO nanosheet bands on ZnCo2O4 submicron rods toward high-performance Li ion battery electrodes. NanoRes.2013, 6(5): 348–355