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

Sharad B. Patil, In Young Kim, Jayavant L. Gunjakar, Seung Mi Oh, Taedaehyeong Eom, Hyungjun Kim, Seong Ju Hwang

Research output: Contribution to journalArticle

22 Citations (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 α-Ga2O3/β-Ga2O3/γ-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. (Graph Presented).

Original languageEnglish
Pages (from-to)18679-18688
Number of pages10
JournalACS Applied Materials and Interfaces
Volume7
Issue number33
DOIs
Publication statusPublished - 2015 Aug 26

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Gallium
Oxides
Graphene
Anodes
Tuning
Nanocomposites
Phase control
Metals
Density functional theory
Lithium-ion batteries
gallium oxide
Electrodes
Functional materials
Crystal structure
Phase transitions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Patil, Sharad B. ; Kim, In Young ; Gunjakar, Jayavant L. ; Oh, Seung Mi ; Eom, Taedaehyeong ; Kim, Hyungjun ; Hwang, Seong Ju. / 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. In: ACS Applied Materials and Interfaces. 2015 ; Vol. 7, No. 33. pp. 18679-18688.
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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. / Patil, Sharad B.; Kim, In Young; Gunjakar, Jayavant L.; Oh, Seung Mi; Eom, Taedaehyeong; Kim, Hyungjun; Hwang, Seong Ju.

In: ACS Applied Materials and Interfaces, Vol. 7, No. 33, 26.08.2015, p. 18679-18688.

Research output: Contribution to journalArticle

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T2 - An Experimental and Theoretical Study

AU - Patil, Sharad B.

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AU - Gunjakar, Jayavant L.

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