Solar energy storage materials

Details Solar energy storage materials Solar energy storage materials

1983-04-29

1985-02-05

Lieberman, Paul

Compositions

Frost-preventing, ice-thawing, thermostatic, thermophoric,...

126452, 126900, C09K 500

Patent

active

044977247

ABSTRACT:
This invention relates to a solar energy storage material comprising N,N'-bis(phenylacetyl)indigo dissolved in a polar solvent. Of the indigo derivatives capable of storing the solar energy by the photoisomerization from trans-isomer to cis-isomer of the molecule, all of the compounds obtained so far had an energy storage capacity of only 30 cal or less per 1 g of the compound and also a high thermal isomerization rate from cis form to trans form in solution. Thus, they cannot be called a solar energy storage material of practical value.
In the case of the present invention, on the other hand, when N,N'-bis(phenylacetyl)indigo is dissolved in a polar solvent such as acetonitrile, it is possible to store about 60 cal of energy per 1 g of N,N'-bis(phenylacetyl)indigo, and the half-life period of isomerization from cis to trans from in acetonitrile at 17.degree. C. is 1,264 minutes, which is also a satisfactory value for practical application.

REFERENCES:
patent: 3715212 (1973-02-01), Ross
patent: 4105014 (1978-08-01), Schwerzel et al.
Scharf et al., "Criteria for Efficiency, Stability and Capacity of an Abiotic Photochemical Solar Energy Storage System", Angew. Chem. 1979, 91(9), 696-707.

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