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Title
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Water-Electrolysis Cells Using Hydrogen-Diffusion Cathodes
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Date
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1967
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Index Abstract
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Not Available
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Photo Quality
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Not Needed
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Report Number
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AMRL TR 67-65
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Creator
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Kolic, Edwin S.
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Clifford, John E.
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Corporate Author
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Battelle Memorial Institute
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Laboratory
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Aerospace Medical Research Laboratories
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Extent
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50
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Identifier
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AD0664361
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Access Rights
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Distribution of this document is unlimited. It may be relased to the Clearinghouse, Department of Commerce, for sale to the general public.
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Distribution Classification
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1
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Contract
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AF 33(615)-2954
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DoD Project
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6373
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DoD Task
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637302
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DTIC Record Exists
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No
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Distribution Change Authority Correspondence
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None
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Distribution Conflict
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No
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Abstract
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The feasibility of extended operation of palladium-silver alloy hydrogen-diffusion cathodes was demonstrated by essentially 100 percent hydrogen transmission for 486 days of operation at the following experimental conditions: 6.35-mm-OD x 0.013-mm-wall Pd-25Ag cathode tube at 37 ma/sq cm; free electrolyte cell with 22 ml of 60 percent NaOH at 145C; cell voltage of 1.74 +0.03 or -0.03 volts with solid cylindrical platinum anode. The determination of the maximum efficient current density (MECD) as a function of temperature indicated that satisfactory operation in the above run could have been obtained at temperatures as low as 112C; 53C with new cathode-activation treatments; or 30C with rhodium treatment of the cathode. In addition to platinum, platinum-10 rhodium alloy was shown to be a satisfactory anode material, but not gold. The feasibility of producing hydrogen gas at a pressure 15 psi higher than oxygen with only a slight decrease in MECD was demonstrated. New electrolyte preelectrolysis procedures were developed to counteract apparent purity variations in reagent-grade NaOH pellets. Of a number of possible matrix materials investigated, the longest satisfactory operation was obtained with fuel-cell asbestos: 280 hours at 70C and 37 ma/sq cm, but only 15 hours at 135C. The feasibility of using a free electrolyte of phosphoric acid was demonstrated in a 4-hour run at 37 ma/sq cm and 60C.
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Report Availability
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Full text available
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Date Issued
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1967-11
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Provenance
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RAF Centre of Aviation Medicine
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Type
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report
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Format
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1 online resource