Article

Dynamics of Au (001) Surface in Electrolytes: In-Situ Coherent X-ray Scattering and Scanning Tunneling Microscopy

10/2011;
Source: arXiv

ABSTRACT We studied dynamics of Au (001) surface in situ in 0.1 M HClO4 electrolyte
solution using both coherent x-ray scattering and scanning tunneling microscopy
(STM). The surface of Au (001) is known to reconstruct at cathodic potentials;
the reconstruction lifts at anodic potentials. In our in-situ STM experiments,
the measurements focus on time-dependent progressions of surface morphology
during slow potential sweep. In our in-situ coherent x-ray scattering
measurements, we demonstrate that the equilibrium surface dynamics are directly
measurable and the measured dynamics are consistent with morphological
evolution of the STM images. These experiments represent the first successful
application of coherent x-ray scattering to the study of electrochemical
interfaces in situ.

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Keywords

anodic potentials
 
Au
 
cathodic potentials
 
coherent x-ray scattering
 
dynamics
 
equilibrium surface dynamics
 
in-situ STM experiments
 
measurable
 
measured dynamics
 
measurements focus
 
reconstruction lifts
 
slow potential sweep
 
STM images
 
surface morphology
 
time-dependent progressions