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Phase Tuning of Nanostructured Gallium Oxide via Hybridization with Reduced Graphene Oxide for Superior Anode Performance in Li-Ion Battery: An Experimental and Theoretical Study

Title
Phase Tuning of Nanostructured Gallium Oxide via Hybridization with Reduced Graphene Oxide for Superior Anode Performance in Li-Ion Battery: An Experimental and Theoretical Study
Authors
Patil, Sharad B.Kim, In YoungGunjakar, Jayavant L.Oh, Seung MiEom, TaedaehyeongKim, HyungjunHwang, Seong-Ju
Ewha Authors
황성주Gunjakar Jayavant Laxman
SCOPUS Author ID
황성주scopus; Gunjakar Jayavant Laxmanscopus
Issue Date
2015
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link
Citation
vol. 7, no. 33, pp. 18679 - 18688
Keywords
phase controlgallium oxidereduced graphene oxidenanocompositeelectrode materials
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The crystal phase of nanostructured metal oxide can be effectively controlled by the hybridization of gallium oxide with reduced graphene oxide (rGO) at variable concentrations. The change of the ratio of Ga2O3/rGO is quite effective in tailoring the crystal structure and morphology of nanostructured gallium oxide hybridized with rGO. This is the first example of the phase control of metal oxide through a change of the content of rGO hybridized. The calculations based on density functional theory (DFT) clearly demonstrate that the different surface formation energy and Ga local symmetry of Ga2O3 phases are responsible for the phase transition induced by the change of rGO content. The resulting Ga2O3 rGO nanocomposites show promising electrode performance for lithium ion batteries. The intermediate Li-Ga alloy phases formed during the electrochemical cycling are identified with the DFT calculations. Among the present Ga2O3 rGO nanocomposites, the material with mixed alpha-Ga2O3/beta-Ga2O3/gamma-Ga2O3 phase can deliver the largest discharge capacity with the best cyclability and rate characteristics, highlighting the importance of the control of Ga2O3/rGO ratio in optimizing the electrode activity of the composite materials. The present study underscores the usefulness of the phase-control of nanostructured metal oxides achieved by the change of rGO content in exploring novel functional nanocomposite materials.
DOI
10.1021/acsami.5b05154
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자연과학대학 > 화학·나노과학전공 > Journal papers
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