Novel cobalt oxide-nanobubble-decorated reduced graphene oxide sphere with superior electrochemical properties prepared by nanoscale Kirkendall diffusion process
- Authors
- Park, Gi Dae; Cho, Jung Sang; Kang, Yun Chan
- Issue Date
- 10월-2015
- Publisher
- ELSEVIER
- Keywords
- Kirkendall diffusion; Graphene composite; Lithium ion battery; Spray pyrolysis
- Citation
- NANO ENERGY, v.17, pp.17 - 26
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 17
- Start Page
- 17
- End Page
- 26
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92245
- DOI
- 10.1016/j.nanoen.2015.07.026
- ISSN
- 2211-2855
- Abstract
- In this study, a novel metal oxide-reduced graphene oxide (RGO) composite structure, denoted as a "nanobubble-decorated RGO sphere," was fabricated and characterized for potential use in Li-ion batteries. The nanobubble-decorated RGO sphere consists of an RGO sphere uniformly decorated with hollow metal oxide nanopowder. Reduction of the composite powder prepared by spray pyrolysis under H-2/Ar gas mixture formed RGO spheres decorated with metal nanopowders. The metal nanopowders were transformed into hollow metal oxide nanopowders, or nanobubbles, by the nanoscale Kirkendall diffusion process. Cobalt oxide nanobubble-decorated RGO spheres, prepared as the first target material, showed excellent Li-storage properties. The cobalt oxide-RGO composite powders, tested at the current density of 2 A g(-1) for 200 cycles before and after the nanoscale Kirkendall diffusion, showed discharge capacities of 932 and 1156 mA h g(-1), respectively; their capacity retentions measured from the second cycle onward were 89% and 99%, respectively. (C) 2015 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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