Preparation of dispersed platinum on conductive tin oxide and its catalytic activity for oxygen reduction
An investigation was carried out to find the optimum conditions for pretreatment of SnO/sub 2/ coatings and for chemisorption from aqueous platinum solution. An alkaline pretreatment, using 10M NaOH, caused an increasin Pt uptake rate up to a limiting value that was reached after relatively short soaking at elevated temperature. A platinizing solution, containing 1000 ppm Pt(IV) + 0.135M Na/sub 2/HPO/sub 4/ + 0.5M NaCl was the most effective found so far in achievin chemisorption. Platinized electrodes were electroreduced after preheating at 200/sup 0/C. Platinum analysis by RBS showed a linear increase of Pt content with platinizing time. A monolayer equivalent Pt was reached in several hours soaking at 90/sup 0/C. Dispersion, defined as the ratio of surface Pt atoms determined electrochemically to total Pt atoms determined by RBS, reache very high values (greater than or equal to 0.9) for Pt loadings of 0.2 to 1 ..mu..g/app cm/sup 2/. The prepared electrodes showed a higher activity than that of metallic platinum electrodes in catalyzing oxygen reduction in alkaline solution.
- Research Organization:
- Department of Chemistry, University of Florida, Gainesville, Florida
- OSTI ID:
- 5682724
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 130:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
OXYGEN
REDUCTION
PLATINUM
CATALYTIC EFFECTS
CATALYSTS
CHEMISORPTION
ELECTROCHEMISTRY
ELECTRODES
PH VALUE
SODIUM HYDROXIDES
TIN OXIDES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SORPTION
TIN COMPOUNDS
TRANSITION ELEMENTS
400400* - Electrochemistry