A dialytic battery (
DB) with ion-exchange membranes can convert the mixing free energy into the electric energy. The solar membrane cell (
SMC) which was proposed by one of the present authors consists of
DB and a solar still. The seawater is separated into the fresh water and the concentrated seawater by flowing through the solar still. Therefore, in order to seek a feasibility of
SMC it needs to make a performance test of
DB at higher concentration than the seawater. In the present study, an experimental study has been made on the concentration dependence of the
DB-performance. The dialytic battery constructed consists of 101 compartments and has an effective area of 475cm
2 per a sheet of ion-exchange menbrane. The carbon plate electrodes were used, which would produce not only an electric power, but also useful materials such as Cl
2-, H
2-gas as a result of the electrode reaction. The saline water concentration c
c ranged from 3.5-17
wt%. The open circuit potential decreased from 9 to 7
V with increasing c
c. The power output, however, increased considerably with the increase in c
c due to the decrease in the internal resistance: The maximum power of about 1100
mW was obtained at the concentration of 17
wt%. The Weinstein-Leitz model has been modified so as to be applicable to the present case. An good agreement was obtained between the calculated and the measured.
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