tailieunhanh - Báo cáo hóa học: " Hydrothermally Processed Oxide Nanostructures and Their Lithium–ion Storage Properties"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hydrothermally Processed Oxide Nanostructures and Their Lithium–ion Storage Properties | Nanoscale Res Lett 2010 5 1841-1845 DOI s11671-010-9722-y NANO EXPRESS Hydrothermally Processed Oxide Nanostructures and Their Lithium-ion Storage Properties Jung-Ho Ahn Yong-Jin Kim Guoxiu Wang Received 22 June 2010 Accepted 26 July 2010 Published online 13 August 2010 The Author s 2010. This article is published with open access at Abstract Y- and Si-based oxide nanopowders were synthesized by a hydrothermal reaction of Y or Si powders with NaOH or LiOH aqueous solution. Nanoparticles with different morphology such as elongated nanospheres flower-like nanoparticles and nanowires were produced by a control of processing parameters in particular the starting composition of solution. The preliminary result of electrochemical examination showed that the hydrother-mally processed nanowires exhibit high initial capacities of Li-ion storage 653 mAh g for Y2O3 nanowires as anode materials and 186 mAh g for Li2Si2O5 nanowires as cathode materials in a Li secondary cell. Compared to the powder with elongated sphere or flower-like shapes the nanowires showed a higher Li-ion capacity and a better cycle property. Keywords Hydrothermal reaction Nanowires Li-ion cell Nanopowders Crystal growth . Ahn School of Material Engineering Andong National University 388 Songchun-dong Andong Gyungbuk 760-010 Korea e-mail jhahn@ . Kim Functional Materials Division Korea Institute of Materials Science Sangnan-dong Changwon Gyungnam 641-010 Korea G. Wang Department of Chemistry and Forensic Science University of Technology Sydney NSW 2007 Australia Introduction Nano-sized metal oxides have interesting properties which cannot be expected in conventional microcrystalline materials 1-5 . Due to high specific surface area and unique structures they have attracted much attention among scientists for potential applications in electronic devices chemical and physical sensors photocatalysts materials for energy conversion and energy storage etc. In .