Atomic Structure of Cu(111) Surfaces in Dilute Sulfuric Acid Solution
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- 作者：Peter Broeckmann ; Michael Wilms ; Matthias Arenz ; Alexander Sp?nig ; Klaus Wandelt
- 刊名：Topics in Applied Physics
- 出版年：2003
- 出版时间：2003
- 年：2003
- 卷：85
- 期：1
- 页码：pp.141-197
- 全文大小：3,242 KB
- 刊物类别：Springer Berlin / Heidelberg
- 刊物主题：Physics
Magnetism and Magnetic Materials
Optical and Electronic Materials
Laser Technology and Physics and Photonics
Quantum Computing, Information and Physics
Applied Optics, Optoelectronics and Optical Devices
Solid State Physics and Spectroscopy
Condensed Matter - 出版者：Springer Berlin / Heidelberg
文摘
The whole range of processes occurring at a single crystal Cu(111) electrode in a sulfuric acid electrolyte (5mMH2SO4) between hydrogen evolution and copper dissolution has been studied using a combination of Cyclic Voltammetry (CV), in situ Scanning Tunneling Microscopy (STM), and in situ Fourier Transform Infrared Spectroscopy (FTIR) as well as ex situ characterization by means of Auger Electron Spectroscopy (AES), X-ray Photoelectron Spectroscopy (XPS) and Low Energy Electron Diffraction (LEED). In particular, in situ STM measurements with atomic resolution, carried out under various conditions, namely in the poten-tiostatic, potentiodynamic and quasi-spectroscopic mode, provide very detailed and direct information about the following interfacial properties and processes: the adsorption and desorption kinetics of the sulfate anions; the structure of the sulfate adlayer and the reconstruction of the copper surface underneath including drastic morphological changes of the electrode surface; the absolute adsorption geometry of individual SO4/2- anions; the anodic copper corrosion and redeposition as well as the formation of cationic adsorbate (probably hydronium) layers in the regime of hydrogen evolution. Altogether the results demonstrate that already a relatively simple system such as Cu(111) in sulfuric acid solution may exhibit a surprisingly high degree of complexity.