Accession Number : AD0691844

Title :   A SOLID ELECTROLYTE CARBON DIOXIDE REDUCTION SYSTEM.

Descriptive Note : Final rept. Dec 67-Sep 68,

Corporate Author : ISOMET CORP PALISADES PARK N J

Personal Author(s) : Chandler,Horace W. ; Howell,Lawrence J.

Report Date : APR 1969

Pagination or Media Count : 80

Abstract : An investigation of solid electrolyte cells utilizing a 90 mole % ZrO2-10 mole % Y2O3 electrolyte and platinum electrodes for the reduction of carbon dioxide to carbon monoxide and oxygen was carried out. At 1000 C, oxygen production efficiency is less than 50% when the cell is operated at a current density greater than 0.040 amp/cu cm on a dry CO/CO2 mixture as cathode feed. Reduction of the solid electrolyte because of insufficiently rapid transfer of oxygen from the cathode feed gas to the cathode is the direct cause of low current efficiency. Reduction of the electrolyte can lead to formation of a two-phase region in the electrolyte which can, in turn, result in permanent damage to the electrolyte. The presence of water vapor in the feed mixture of CO and CO2 decreases cell polarization, decreases electrolyte reduction and increases oxygen production efficiency. (Author)

Descriptors :   (*CARBON DIOXIDE, REDUCTION(CHEMISTRY)), (*OXYGEN, *GAS GENERATING SYSTEMS), (*CONTROLLED ATMOSPHERES, CARBON DIOXIDE), ELECTROLYTES, ZIRCONIUM OXIDES, OXIDES, YTTRIUM COMPOUNDS, CARBON MONOXIDE, ELECTROCHEMISTRY

Subject Categories : Industrial Chemistry and Chemical Processing
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE