期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 125, 期 -, 页码 66-78出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2017.02.005
关键词
Reduced graphene oxide; TiO2; Supercritical alcohol; Lithium secondary batteries; Anode materials
资金
- National Research Foundation of Korea (NRF) - Korea government Ministry of Science, ICT & Future Planning [2016R1A2B3008800]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20124010203270]
- Korea Institute of Science and Technology (KIST) Institutional Program [2E26330/2E26292]
TiO2-reduced graphene oxide (RGO) hybrids were prepared using one-pot, simultaneous reduction of graphene oxide (GO) to RGO and anchoring of TiO2 nanoparticles on the surface of RGO in supercritical isopropanol. Numerous anchor sites facilitating heterogeneous nucleation of TiO2 particles on GO, and extremely fast nucleation due to the supercritical alcohol led ultrafine, well-dispersed anatase TiO2 nanoparticles to anchor to the RGO sheets in a single step. The unique synthetic approach developed herein was very effective for preventing restacking of graphene sheets during reduction, and for tightly anchoring TiO2 nanoparticles to the RGO surface. When the TiO2-RGO with a TiO2 loading of 48 wt% tested as an anode in lithium-ion battery, it exhibited excellent electrochemical performance with a high reversible capacity of 229 mAh g(-1) at 50 mAg(-1) after 50 cycles and a high-rate performance of 115 mAh g(-1) at 1 A g(-1), and 95% of the initial capacity was retained even after 1000 cycles (at rate of 1 A g(-1)). (C) 2017 Elsevier B.V. All rights reserved.
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