Effect of crystallographic orientation of single-crystal RuO/sub 2/ electrodes on the hydrogen adsorption reactions

Journal Article · Sat Sep 01 04:00:00 EDT 1984 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2116026· OSTI ID:6249528

Hepel, T; O'Grady, W E; Pollak, F M

Linear potential scan and cyclic voltammetric behavior of the single-crystal RuO/sub 2/ (110), (001), (111), (101), and (100) surfaces in 0.5 mol/dm/sup -3/ H/sub 2/SO/sub 4/ solution have been studied. Significant differences in electrochemical characteristics observed in the hydrogen adsorption/desorption region have been correlated with the differences in composition and structure of the ideal, model surfaces of the RuO/sub 2/ single crystals. A cathodic/anodic pair of peaks H /SUB 2C/ , H /SUB 2A/ observed at about -0.3V (SCE) for the RuO/sub 2/ faces (110), (001), (111), and (101) has been ascribed to the reversible hydrogen adsorption/desorption on ruthenium sites. Another pair of peaks H /SUB 1C/ and H /SUB 1A/ at about E = 0 V (SCE), which appeared only on surfaces where oxygen is present, i.e., faces (110) and (001) has been attributed to the hydrogen chemisorption on oxygen sites. The adsorption Temkin coefficients g have been estimated. The correlation between the chemisorption peak currents and the surface density of the ruthenium sites is presented and discussed in detail. An interesting kinetic effect has been observed for the (100) RuO/sub 2/ surface. The peak structure for RuO/sub 2/ (100) cannot be correlated with the properties of the ideal surface, probably because of the surface restructuring effects. The best electrocatalytical properties have been found for the (101) RuO/sub 2/ surface, good ones have been found for the (111) face, and poor for (110) and (001) faces.

• Research Organization: Department of Physics, Brooklyn College of Cuny, Brooklyn, New York
• OSTI ID: 6249528
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 131:9; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080201* -- Hydrogen-- Chemisorption Storage
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ADSORPTION
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CHEMISTRY
CRYSTALLOGRAPHY
CRYSTALS
DESORPTION
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
HYDROGEN STORAGE
KINETICS
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SEPARATION PROCESSES
SORPTION
STORAGE
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VOLTAMETRY