کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10224468 | 1701107 | 2018 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical solid-state amorphization in the immiscible Cu-Li system
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
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چکیده انگلیسی
As a typical immiscible binary system, copper (Cu) and lithium (Li) show no alloying and chemical intermixing under normal circumstances. Here we show that, when decreasing Cu nanoparticle sizes into ultrasmall range, the nanoscale size effect can play a subtle yet critical role in mediating the chemical activity of Cu and therefore its miscibility with Li, such that the electrochemical alloying and solid-state amorphization will occur in such an immiscible system. This unusual observation was accomplished by performing in-situ studies of the electrochemical lithiation processes of individual CuO nanowires inside a transmission electron microscopy (TEM). Upon lithiation, CuO nanowires are first electrochemically reduced to form discrete ultrasmall Cu nanocrystals that, unexpectedly, can in turn undergo further electrochemical lithiation to form amorphous CuLix nanoalloys. Real-time TEM imaging unveils that there is a critical grain size (ca. 6â¯nm), below which the nanocrystalline Cu particles can be continuously lithiated and amorphized. The possibility that the observed solid-state amorphization of Cu-Li might be induced by electron beam irradiation effect can be explicitly ruled out; on the contrary, it was found that electron beam irradiation will lead to the dealloying of as-formed amorphous CuLix nanoalloys.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science Bulletin - Volume 63, Issue 18, 30 September 2018, Pages 1208-1214
Journal: Science Bulletin - Volume 63, Issue 18, 30 September 2018, Pages 1208-1214
نویسندگان
Muhua Sun, Jiake Wei, Zhi Xu, Qianming Huang, Yu Zhao, Wenlong Wang, Xuedong Bai,