Title

Photon energy storage in organic materials- The case of linked anthracenes

Document Type

Article

Publication Date

1-1-1978

Abstract

Criteria for the photochemical conversion of solar energy are reviewed in terms of utilization of photoactive organic materials. Endoergic valence isomerizations which may be driven by visible light are proposed for study. These isomerizations store electronic excitation energy as chemical potential energy. Products of the proposed photoreactions are kinetically stable for energy storage over controllable periods. Stored energy is retrieved by thermal or catalytic recycling to the original photoactive substance. Such organic materials are potentially useful as additives to working fluids of conventional solar-thermal conversion units. Photon energy storage is illustrated in several examples which utilize 300-500 nm radiation for isomerizations with storage capacities of about 400 J/g (about 100 cal/g). New data including quantum efficiencies, storage capacities and conditions for recycling are presented for a series of linked anthracenes. A photocalorimeter capable of direct measurement of storage enthalpies is described. The economic and physical requirements of a photochemical storage material are outlined, and several systems for the conversion of solar energy on an appropriate scale are suggested. © 1978.

Publication Name

Solar Energy

Volume Number

20

First Page

241

Last Page

248

Issue Number

3

DOI

10.1016/0038-092X(78)90103-2

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