Effects of anions on the electrodeposition of cobalt on Pt(111) electrode

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題名:	Effects of anions on the electrodeposition of cobalt on Pt(111) electrode
作者:	姚學麟;Kuo, Yenchung;Liao, Weicheng;Yau, ShuehLin
貢獻者:	理學院化學學系
關鍵詞:	anions;cobalt;electrodes;hydrogen production;potassium sulfate;scanning tunneling microscopy;silver;silver chloride;sulfuric acid
日期:	2014-11-25
上傳時間:	2026-04-21 14:30:38 (UTC+8)
出版者:	American Chemical Society;United States: American Chemical Society
摘要:	摘要： Voltammetry and in-situ scanning tunneling microscopy (STM) were used to examine electrodeposition of cobalt (Co) on a stationary Pt(111) electrode in 0.1 M K2SO4 + 1 mM H2SO4 + 10 mM CoSO4 (or the sulfate solution) without and with 10 mM chloride (the chloride solution). Under- and overpotential deposition (UPD and OPD) of Co resulted in reduction peaks at −0.52 and −0.74 V (vs Ag/AgCl), respectively. Hydrogen evolution was the major obstruction to Co2+ reduction, which limited the efficiency of Co deposition at ∼63% in both solutions. UPD of Co resulted in a highly ordered honeycomb structure in the sulfate solution, whereas that formed in the chloride solution was clearly disordered. Multilayer Co deposit formed by OPD at −0.74 V in the sulfate medium was crystalline, forming moiré structures for the first eight layers, followed by pyramids made of stacked triangles. These results suggested face-centered cubic stacking of the Co deposit. Co film produced in the chloride solution was also layered, except perimeters of Co layers were mostly rugged. Distinct screw dislocations and spiral defects were seen in the Co thin films produced in both solutions. 其他題名： Langmuir 出版者： United States: American Chemical Society 出版日期： 2014-11-25 出處： Langmuir, 2014-11, Vol.30 (46), p.13890-13897 資源來源： American Chemical Society Journals 版權： Copyright © 2014 American Chemical Society 識別號： ISSN: 0743-7463 識別號： ISSN: 1520-5827 識別號： EISSN: 1520-5827 識別號： DOI: 10.1021/la503513s 識別號： PMID: 25372652
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