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Synthesis of Uniquely Structured SnO 2 Hollow Nanoplates and Their Electrochemical Properties for Li‐Ion Storage
Author(s) -
Park Gi Dae,
Lee JungKul,
Kang Yun Chan
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201603399
Subject(s) - kirkendall effect , materials science , chemical engineering , amorphous solid , nanotechnology , electrochemistry , metal , ion , electrode , metallurgy , crystallography , chemistry , physics , quantum mechanics , engineering
A new mechanism for the transformation of nanostructured metal selenides into uniquely structured metal oxides via the Kirkendall effect, which results from the different diffusion rates of metal and Se ions and O 2 gas, is proposed. SnSe nanoplates are selected as the first target material and transformed into SnO 2 hollow nanoplates by the Kirkendall effect. SnSe‐C composite powder, in which SnSe nanoplates are attached or stuck to amorphous carbon microspheres, transforms into several tens of SnO 2 hollow nanoplates by a thermal oxidation process under an air atmosphere. Core–shell‐structured SnSe‐SnSe 2 @SnO 2 , SnSe 2 @SnO 2 , Se‐SnSe 2 @SnO 2 , and Se@SnO 2 and yolk–shell‐structured Se@void@SnO 2 intermediates are formed step‐by‐step during the oxidation of the SnSe nanoplates. The uniquely structured SnO 2 hollow nanoplates have superior cycling and rate performance for Li‐ion storage. Additionally, their discharge capacities at the 2nd and 600th cycles are 598 and 500 mA h g ‐1 , respectively, and the corresponding capacity retention measured from the 2nd cycle is as high as 84%.