Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1689543 | Vacuum | 2016 | 8 Pages |
Abstract
A low-temperature oxidation-reduction process was used to modify the surface of a Cu current collector (foil) for a Si film electrode. The surfaces of the modified Cu foils were investigated under various oxidation-reduction conditions, and the electrochemical properties of Si film electrodes containing the surface modified foils were evaluated. Various nanostructures were found to have formed on the surface; for example, Cu(OH)2 needles, CuO flowers, and CuO plates formed on Cu-foil surfaces oxidized at 313Â K for 1, 10, and 30Â min, respectively. Furthermore, these nanostructures were transformed to coral-like Cu2O structures after reduction at 673Â K. The amount of Cu2O and the surface roughness decreased on increasing reduction time. The Si film electrode containing a Cu foil reduced for 6Â h showed the best electrochemical performance (83.5% of the initial efficiency and 74.8% of capacity retention) due to the small amount of Cu2O and the formation of coral-like structures.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Gyu-Bong Cho, Jae-Seung Jeong, Yeon-Min Im, Hyon-Kwang Choi, Jung-Pil Noh, Jae-Kwang Kim, Hyo-Jun Ahn, Tae-Hyun Nam, Ki-Won Kim,