resumo
Galvanic replacement reactions provide a simple and versatile route for producing hollow nanostructures with controllable pore structures and compositions. However, these reactions have previously been limited to the chemical transformation of metallic nanostructures. We demonstrated galvanic replacement reactions in metal oxide nanocrystats as well. When manganese oxide (Mn3O4) nanocrystals were reacted with iron(II) perchlorate, hollow box-shaped nanocrystats of Mn3O4/gamma-Fe2O3 ("nanoboxes") were produced. These nanoboxes ultimately transformed into hollow cagetike nanocrystats of gamma-Fe2O3 ("nanocages"). Because of their nonequihbrium compositions and hollow structures, these nanoboxes and nanocages exhibited good performance as anode materials for lithium ion batteries. The generality of this approach was demonstrated with other metal pairs, including Co3O4/SnO2 and Mn3O4/SnO2.
palavras-chave
LITHIUM-ION BATTERIES; CATION-EXCHANGE; ANODE MATERIAL; NANOPARTICLES; HYBRID; SILVER; NANOSTRUCTURES; NANOCAPSULES; TEMPERATURE; DISSOLUTION
categoria
Science & Technology - Other Topics
autores
Oh, MH; Yu, T; Yu, SH; Lim, B; Ko, KT; Willinger, MG; Seo, DH; Kim, BH; Cho, MG; Park, JH; Kang, K; Sung, YE; Pinna, N; Hyeon, T
nossos autores
Nicola Pinna
InvestigadorGrupos
agradecimentos
We acknowledge financial support by the Research Center Program of the IBS in Korea (T.H. and Y.-E.S.); the WCU (R31-10013) Program of the National Research Foundation (NRF) of Korea (T.H., N.P., and Y.-E.S.); Portuguese Fundacao para a Ciencia e a Tecnologia project (PTD/CTM/100468/2008 and REDE/1509/RME/2005) for TEM work (M.-G.W. and N.P.); a Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning grant funded by the Korea government Ministry of Trade, Industry and Energy (20124010203320) (K.K. and D.-H.S); and National Creative Initiative (2009-0081576), WCU (R31-2009-000-10059), and Max Plank POSTECH/KOREA Research Initiative (2011-0031558) programs though the NRF of Korea (K.-T.K. and J.-H.P.). The Pohang Accelerator Laboratory is supported by POSTECH and the Ministry of Science, ICT and Future Planning.