Trends in activity and stability of electrodeposited 3d transition metals on gold revealed by operando soft X-ray absorption spectroscopy during water splitting
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.
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語言 en_US
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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
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111832 )