Metal organic framework-templated hollow Co3O4 nanosphere aggregate/N-doped graphitic carbon composite powders showing excellent lithium-ion storage performances
- Authors
- Park, Seung-Keun; Kim, Jin Koo; Kim, Jong Hwa; Kang, Yun Chan
- Issue Date
- 10월-2017
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Metal-organic framework; Cobalt oxide; Kirkendall effect; Hollow structure; Graphitic carbon; Lithium-ion batteries
- Citation
- MATERIALS CHARACTERIZATION, v.132, pp.320 - 329
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 132
- Start Page
- 320
- End Page
- 329
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82104
- DOI
- 10.1016/j.matchar.2017.08.026
- ISSN
- 1044-5803
- Abstract
- Hollow Co3O4 nanosphere aggregate/N-doped graphitic carbon (HCO/NGC) composite powders, exhibiting excellent Li-ion storage performances, were prepared by applying metal-organic frameworks (MOFs). Zeolitic imidazolate framework (ZIF)-67 cubes were reduced to produce Co/NGC composite powders. The Co/NGC composite powders were oxidized to produce cubic HCO/NGC composite powders, in which the hollow Co3O4 nanospheres were uniformly covered with a NGC layer. The Co nanocrystals transformed into hollow nano spheres during oxidation via the nanoscale Kirkendall diffusion process. The unique composite structure accommodates mechanical stress owing to the void spaces within the Co3O4 nanospheres; it also prevents structure collapse during cycling owing to the presence of the NGC matrix. Thus, the cubic hollow powders exhibited excellent electrochemical performances when used as an anode material in Li-ion batteries (LIBs). Following 250 cycles, the HCO/NGC composite powders with 11 wt% NGC delivered a discharge capacity of 1030 mA h g(-1) at a current density of 1 A g(-1). In addition, the composite powders delivered a discharge capacity of 738 mA h g(-1) even at a high current density of 10 A g(-1).
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.