Electrocatalysis of anodic oxygen-transfer reactions at modified lead dioxide electrodes

Technical Report · Fri Sep 21 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6562056· OSTI ID:6562056

Hsiao, Yun-Lin

The electrocatalytic activities were compared for pure and chloride-doped beta-PbO{sub 2} (Cl-PbO{sub 2}) films on gold and platinum substrates. Rate constants were increased significantly for oxidations of Mn{sup 2+}, toluene, benzyl alcohol, dimethylsulphoxide (DMSO) and benzaldehyde in acidic media by the incorporation of Cl{sup {minus}} into the oxide films. These reactions are concluded to occur by the electrocatalytic transfer of oxygen from H{sub 2}O to the reaction products. Results of x-ray diffraction studies indicate the Cl-PbO{sub 2} film continues to have the slightly distorted rutile structure of pure beta-PbO{sub 2}. The observed electrocatalytic phenomena are concluded to be the beneficial consequence of surface defects generated when Cl{sup {minus}} serves for charge compensation within the surface matrix and, thereby, increases the number of surface sites capable of adsorbing hydroxyl radicals which are transferred in the electrocatalytic O-transfer reactions. 91 refs., 44 figs., 10 tabs.

• Research Organization: Ames Lab., IA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6562056
• Report Number(s): IS-T-1451; ON: DE91000664
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ALCOHOLS
ALDEHYDES
ALKYLATED AROMATICS
ANIONS
AROMATICS
ARSENIC
BENZALDEHYDE
BENZYL ALCOHOL
BISMUTH
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORINE
DMSO
DOPED MATERIALS
ELECTROCATALYSTS
ELECTRODES
ELEMENTS
FILMS
HALOGENS
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
HYDROXYL RADICALS
INORGANIC ACIDS
IONS
KINETICS
LEAD COMPOUNDS
LEAD OXIDES
MANGANESE
MATERIALS
METALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RADICALS
REACTION KINETICS
SEMIMETALS
SULFOXIDES
SULFURIC ACID
SURFACE PROPERTIES
TOLUENE
TRANSITION ELEMENTS
WATER