Mechanisms of electrocatalytic kinetics of oxidation of hydrocarbons on solid-oxide electrolyte-electrode surfaces. Final report
This report presents highlights of the results obtained to date on an ongoing investigation of the electrocatalytic mechanisms involved in the anodic oxidation of selected hydrocarbons derivable from coal gas, and the cathodic reduction of O/sub 2/ in a fuel cell employing Sc/sub 2/O/sub 3/-or Y/sub 2/O/sub 3/-stabilized ZrO/sub 2/. The particular focus of the work has been to perform definitive experiments to show that the solid electrolyte plays an important role in electrocatalysis compared to the porous metallic electrode. It has been observed that great enhancement in reaction-rates and current drawn at a given overpotential occurs when the electrolyte is blackened by electrolysis, forming a stable suboxide of zirconia, ZrO/sub 2-x/. Simple potentiometric measurements with pure H/sub 2/, CO, CH/sub 4/, CH/sub 3/OH and C/sub 2/H/sub 5/OH, as the fuel and air oxidant have been made on both the ZrO/sub 2/-Sc/sub 2/O/sub 3/ system in both the unblackened and blackened state. The general kinetic information resulting from this study is being used for optimal modeling and design of practical tubular shaped solid-electrolyte fuel cells employing air and hydrocarbons. A laboratory scale tubular electrochemical reactor has been constructed to provide experimental data of value in modeling.
- Research Organization:
- Stanford Univ., CA (USA)
- DOE Contract Number:
- AT03-79ER10492
- OSTI ID:
- 5260880
- Report Number(s):
- DOE/ER/10492-T1; ON: DE84008048
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HIGH-TEMPERATURE FUEL CELLS
ELECTROCHEMISTRY
HYDROCARBON FUEL CELLS
HYDROCARBONS
OXIDATION
OXYGEN
REDUCTION
COAL GAS
ELECTROCATALYSTS
GOLD
OVERVOLTAGE
PLATINUM
SCANDIUM OXIDES
SOLID ELECTROLYTES
ZIRCONIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELECTROLYTES
ELEMENTS
FLUIDS
FUEL CELLS
GASES
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SCANDIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
300505* - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics