期刊論文
學年 | 105 |
---|---|
學期 | 1 |
出版(發表)日期 | 2016-09-01 |
作品名稱 | Trends in activity and stability of electrodeposited 3d transition metals on gold revealed by operando soft X-ray absorption spectroscopy during water splitting |
作品名稱(其他語言) | |
著者 | 14. J. Velasco Velez; T. Jones; V. Pfeifer; C. L. Dong; Y. X. Chen; C. M. Chen; H. Y. Chen; Y. R. Lu; J. Chen; R. Schlogl; A. Knop-Gericke; C. H. Chuang |
單位 | |
出版者 | |
著錄名稱、卷期、頁數 | Journal of Physics D: Applied Physics 50, 024002 |
摘要 | We activated gold electrodes for their use as electrocatalyst for water splitting by electrodepositing Cu, Ni and Co. A combination of operando x-ray absorption spectroscopy and potentiometric control under aqueous conditions revealed the trends in reactivity yielded by these electrodes, which are directly associated with the cross- and overpotentials as well as the occupancy of the 3d orbitals. It was found that under anodic polarization the materials electrodeposited on gold suffer from a lack of stability, while under cathodic polarization they exhibit stable behavior. The observed activity is strongly related to the lack of stability shown by these composites under anodic polarization revealing a dynamic process ruled by corrosion. By operando x-ray absorption, we established that the overall enhancement of the activity for the oxygen evolution reaction is directly attributable to the cross-potential and corrosion process of the electrodeposited materials. It is associated with the high potential deposition, which is the origin of the incipient oxidation-corrosion resistance of the lattice. We conclude that the observed trends in the total current are directly associated with the loss of oxygen in the metal-oxide lattice and the subsequent dissolution of metallic ions in the electrolyte under anodic polarization. |
關鍵字 | |
語言 | en_US |
ISSN | |
期刊性質 | 國外 |
收錄於 | SCI |
產學合作 | |
通訊作者 | |
審稿制度 | 否 |
國別 | TWN |
公開徵稿 | |
出版型式 | ,電子版 |
相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111832 ) |