Absorption and desorption rates of H/sub 2/ and D/sub 2/ for LaNi/sub 5/, LaCo/sub 5/, LaNi/sub 2/Co/sub 3/, and FeTi. Interim report

Technical Report · Tue Apr 19 04:00:00 EST 1977

OSTI ID:7299063

Meilleur, C P; Martinelli, M R; Mayer, S W

Rates of H/sub 2/ absorption and desorption were measured for LaNi/sub 5/, LaCo/sub 5/, LaNi/sub 2/CO/sub 3/, and FeTi in order to examine the limitations of these alloys for storing H/sub 2/ in high-power Ni-H/sub 2/ satellite batteries. If the H/sub 2/ absorption and desorption rates are sufficient, H/sub 2/ storage in the alloys could increase the energy density and decrease the volume of Ni-H/sub 2/ spacecraft batteries. The rate measurements showed that the quantity of H/sub 2/ absorbed or desorbed was linearly dependent on the square root of time for all four alloys. This rate law indicated that the rate-controlling step was hydrogen atom diffusion through an adherent hydride layer to the alloy surface. The activation energy for desorption from LaNi/sub 5/ was 4.5 +- 0.5 kcal. Even at 0.4 C, the H/sub 2/ absorption and desorption rates were sufficient that batteries could be charged and dishcarged in less than 30 min. Rates for D/sub 2/ were also determined and found to be lower than for H/sub 2/. The use of LaCo/sub 5/ and LaNi/sub 2/Co/sub 5/ permitted even lower pressures than those needed with LaNi/sub 5/ for H/sub 2/ storage in Ni-H/sub 2/ satellite batteries. (Author)

• Research Organization: Aerospace Corp., El Segundo, CA (USA). Chemistry and Physics Lab.
• OSTI ID: 7299063
• Report Number(s): AD-A-039518; TR-0077(2270-10)-2
• Country of Publication: United States
• Language: English

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ACTIVATION ENERGY
ADSORPTION
ALLOY SYSTEMS
ALLOYS
ANODES
BINARY ALLOY SYSTEMS
COBALT ALLOYS
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ELECTRODES
ELEMENTS
ENERGY
ENERGY STORAGE SYSTEMS
FLUIDS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROGEN STORAGE
INTERMETALLIC COMPOUNDS
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LANTHANUM COMPOUNDS
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NICKEL BASE ALLOYS
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NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SATELLITES
SORPTION
SORPTIVE PROPERTIES
STABLE ISOTOPES
STORAGE
SURFACE PROPERTIES
TERNARY ALLOY SYSTEMS
TIME DEPENDENCE
TIME DEPENDENCE BINARY ALLOY SYSTEMS
TITANIUM ALLOYS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS