The evaluation of surface diffusion coefficients of gold and platinum atoms at electrochemical interfaces from combined STM-SEM imaging and electrochemical techniques

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Journal of the Electrochemical Society; (USA)

DOI:https://doi.org/10.1149/1.2086904· OSTI ID:6530619

Alonso, C; Salvarezza, R C; Vara, J M; Arvia, A J ^[1]; Vazquez, L; Bartolome, A; Baro, A M ^[2]

---

1. Dept. de Quimica, Universidad Autonoma de Madrid, 28049 Madrid (ES)
2. Dept. de Fisica de la Materia Condensada, Univ. Autonoma de Madrid, 28049 Madrid (ES)

A simple method is presented for measuring the surface diffusion coefficients of Au and Pt atoms at electrodispersed electrodes of the same metals in contact with 0.5{ital M} H{sub 2}SO{sub 4}. The technique is based upon the time dependence of the surface roughness factor of electrodispersed metal overlayers. The method requires a model for the surface roughness of the metal structure. The model is deduced from microscopic measurements by a STM integrated into a conventional SEM microscope. This allows the relationship between the roughness factor and the area of the surface structure to be obtained. For Au and Pt in contact with an electrolyte solution, the values of our diffusion coefficients are higher than those reported in vacuum at the same temperature.

• OSTI ID: 6530619
• Journal Information: Journal of the Electrochemical Society; (USA), Vol. 137:7; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ELECTRODEPOSITED COATINGS
SCANNING ELECTRON MICROSCOPY
GOLD
DIFFUSION
PLATINUM
CHEMICAL REACTION KINETICS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
SULFURIC ACID
TIME DEPENDENCE
CHEMISTRY
COATINGS
ELECTRON MICROSCOPY
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
METALS
MICROSCOPY
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENTS
400400* - Electrochemistry
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
360602 - Other Materials- Structure & Phase Studies