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Galvanic Replacement Reactions in Metal Oxide Nanocrystals.

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Title: Galvanic Replacement Reactions in Metal Oxide Nanocrystals.
Authors: Myoung Hwan Oh, Taekyung Yu, Yu, Seung-Ho, Byungkwon Lim, Ko, Kyung-Tae, Willinger, Marc-Georg, Seo, Dong-Hwa, Byung Hyo Kim, Min Gee Cho, Park, Jae-Hoon, Kisuk Kang, Sung, Yung-Eun, Pinna, Nicola, Taeghwan Hyeon
Source: Science (pre-March 2025). 5/24/2013, Vol. 340 Issue 6135, p964-968. 5p.
Subjects: Nanocrystals, Manganese oxides, Electrochemistry, Substitution reactions, Perchlorates, Anodes, Lithium-ion batteries, Metallic oxides, Crystallography
Abstract: 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 nanocrystals as well. When manganese oxide (Mn3O4) nanocrystals were reacted with iron(ll) perchlorate, hollow box-shaped nanocrystals of Mn3O4/ɣ-Fe3O4 ("nanoboxes") were produced. These nanoboxes ultimately transformed into hollow cagelike nanocrystals of ɣ-Fe3O4 ("nanocages"). Because of their nonequilibrium 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. [ABSTRACT FROM AUTHOR]
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Database: Psychology and Behavioral Sciences Collection
Description
Abstract: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 nanocrystals as well. When manganese oxide (Mn3O4) nanocrystals were reacted with iron(ll) perchlorate, hollow box-shaped nanocrystals of Mn3O4/ɣ-Fe3O4 ("nanoboxes") were produced. These nanoboxes ultimately transformed into hollow cagelike nanocrystals of ɣ-Fe3O4 ("nanocages"). Because of their nonequilibrium 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. [ABSTRACT FROM AUTHOR]
ISSN:00368075
DOI:10.1126/science.1234751