期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 33, 页码 18679-18688出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05154
关键词
phase control; gallium oxide; reduced graphene oxide; nanocomposite; electrode materials
资金
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2014R1A2A1A10052809]
- Global Frontier R&D Program - Ministry of Science [2013-073298]
- MOST POSTECH
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据