10.1021/jp500427t.s001
Manuel
A. Méndez
Manuel
A.
Méndez
Pekka Peljo
Pekka
Peljo
Micheál D. Scanlon
Micheál D.
Scanlon
Heron Vrubel
Heron
Vrubel
Hubert H. Girault
Hubert H.
Girault
Photo-Ionic
Cells: Two Solutions to Store Solar Energy
and Generate Electricity on Demand
American Chemical Society
2014
electricity
Store Solar Energy
leucothionine
redox pair
electrochemical flow cell
Co
solution
EDTA
thionine
energy conversion concept
phase
2014-07-31 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Photo_Ionic_Cells_Two_Solutions_to_Store_Solar_Energy_and_Generate_Electricity_on_Demand/2269864
A solar energy conversion concept
based on the photoinduced separation
of a pair of redox species in a biphasic liquid cell is presented.
The redox pair is subsequently discharged in an electrochemical flow
cell to generate electricity. To illustrate this generic concept,
we have revisited the thionine/cobalt EDTA system where, upon light
excitation, the excited thionine dye is quenched in the aqueous solution
by the [Co(II)EDTA]<sup>2–</sup> complex to form both [Co(III)EDTA]<sup>−</sup> and reduced thionine, namely leucothionine, that partitions
to the organic phase. As a result, solar energy is converted to a
redox pair, leucothionine/[Co(III)EDTA]<sup>−</sup>. The two
immiscible liquid phases are separated, and the redox energy is stored
in the respective electrolyte solutions. These two solutions can then
be electrochemically discharged in a flow cell to generate electricity
on demand. The electrode reactions involved are the reoxidation of
leucothionine to thionine in the organic solvent and the reduction
of the Co(III) complex in water.