柯肯德尔效应
材料科学
化学工程
无定形固体
电化学
金属
纳米技术
离子
电极
冶金
结晶学
量子力学
物理
工程类
物理化学
化学
作者
Gi Dae Park,Jung-Kul Lee,Yun Chan Kang
标识
DOI:10.1002/adfm.201603399
摘要
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%.
科研通智能强力驱动
Strongly Powered by AbleSci AI