In-situ surface x-ray scattering studies of electrochemical metal growth and dissolution

• Applicant: Professor Dr. Olaf Magnussen
• Subject Area: Physical Chemistry of Solids and Surfaces, Material Characterisation
• Term: from 2005 to 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5453665

• Final Report Year: 2017

Final Report Abstract

In this project we further developed experimental approaches for in operando studies of growth and restructuring processes at metal electrode surfaces in electrochemical environment. In particular, we demonstrated in situ Grazing Incidence Small-angle X-ray Scattering as a technique for detailed quantitative studies of the nanoscale evolution of the electrode morphology. Studies of Au(001) homoepitaxial growth and Pt(111) surface restructuring via oxidation/reduction cycles by this method provided detailed insights into the potential-dependent microscopic mechanisms of these interface processes. Furthermore, we complemented our previous surface X-ray diffraction studies of Au and Cu electrodeposition by studies of Ag(001) homoepitaxy, the heteroepitaxial growth of Co and Co/Pd on Au(111), and the oxidation/reduction of Co and Pt. In the latter cases fruitful collaborations with other groups were started, where the methods and experimental setups developed in this project were applied to more complex phenomena that are of considerable current interest.

Publications

• In situ surface X-ray diffraction studies of the influence of the PEG-Cl-complex on homoepitaxial electrodepositionon Cu(001), J. Electrochem. Soc. 160, D3165-D3170 (2013)
  F. Golks, Y. Gründer, A. Drünkler, J. Roy, J. Stettner, J. Zegenhagen, O.M. Magnussen
  
• In operando GISAXS studies of mound coarsening in electrochemical homoepitaxy, Phys. Rev. Lett. 112, 055503-1-055503-5 (2014)
  M. Ruge, F. Golks, J. Zegenhagen, O.M. Magnussen, J. Stettner
  
• J. Electroanal. Chem. 712, 74-81 (2014)
  Y. Gründer, A. Drünkler, F. Golks, G. Wijts, J. Stettner, J. Zegenhagen, O.M. Magnussen
  
• In situ surface X-ray diffraction studies of homoepitaxial growth on Cu(001) from aqueous acidic electrolyte, Surf. Sci. 631, 112-122 (2015)
  F. Golks, Y. Gründer, J. Stettner, K. Krug, J. Zegenhagen, O.M. Magnussen
  
• In situ surface X-ray diffraction study of ultrathin epitaxial Co films on Au(111) in alkaline solution, Electrochim. Acta 197, 273-281 (2016)
  F. Reikowski, F. Maroun, P. Allongue, M. Ruge, J. Stettner, O.M. Magnussen
  
• Initial stages of Pt(111) electrooxidation: dynamic and structural studies by surface X-ray diffraction, Electrochim. Acta 224, 220-227 (2017)
  J. Drnec, M. Ruge, F. Reikowski, Björn Rahn, F. Carlà, R. Felici, J. Stettner, O. M. Magnussen, D. A. Harrington