Multiphase and Double-Layer NiFe2O4@NiO-Flollow-NanosphereDecorated Reduced Graphene Oxide Composite Powders Prepared by Spray Pyrolysis Applying Nanoscale Kirkendall Diffusion
- Authors
- Park, Gi Dae; Cho, Jung Sang; Kang, Yun Chan
- Issue Date
- 5-8월-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Kirkendall effect nanostructure; reduced graphene oxide; lithiurn on batteries; spray pyrolysis
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.7, no.30, pp.16842 - 16849
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 7
- Number
- 30
- Start Page
- 16842
- End Page
- 16849
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92775
- DOI
- 10.1021/acsami.5b04891
- ISSN
- 1944-8244
- Abstract
- Multicomponent metal oxide hollow-nanosphere decorated reduced graphene oxide (rGO) composite powders are prepared by spray pyrolysis with nanoscale Kirkendall diffusion. The double-layer NiFe2O4@NiO-hollow-nanosphere decorated rGO composite powders are prepared using the first target material. The NiFe-alloy-nanopowder decorated rGO powders are prepared as an intermediate product by post-treatment under the reducing atmosphere of the NiFe2O4/NiO-decorated rGO composite powders obtained by spray pyrolysis. The different diffusion rates of Ni (83 pm for Ni2+) and Fe (76 pm for Fe2+, 65 pm for Fe3+) cations with different radii during nanoscale Kirkendall diffusion result in multiphase and double-layer NiFe2O4@NiO hollow nanospheres. The mean size of the hollow NiFe2O4@NiO nanospheres decorated uniformly within crumpled rGO is 14 nm. The first discharge capacities of the nanosphere-decorated rGO composite powders with filled NiFe2O4/NiO and hollow NiFe2O4@NiO at a current density of 1 A g(-1) are 1168 and 1319 mA h g(-1), respectively. Their discharge capacities for the 100th cycle are 597 and 951 mA h g(-1), respectively. The discharge capacity of the NiFe2O4@NiO-hollow-nanosphere-decorated rGO composite powders at the high current density of 4 A g(-1) for the 400th cycle is 789 mA h g(-1).
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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