<sup>The photogalvanic effect was studied in a photogalvanic cell containing ethylene diamine tetra-acetic acid [EDTA] as reductant, Toluidine blue and Thionine as photosensitizers. The photopotential and photocurrent generated were 695.0 mV and 105.0 mA, respectively. The observed conversion efficiency was 0.16 percent, the fill-factor was 0.16 and the maximum output of the cell was 72.9mW. The photogalvanic cell can be used at this power level for 42.0 minutes in the dark due to the storage capacity of the cell. The effects of different parameters on electrical output of the cell were observed and a mechanism for the generation of photocurrent in photogalvanic cells has also been proposed.

With the help of current-potential curve, the fill factor and conversion efficiency were determined using the formula:
Vpp x ipp
Fill-factor (n) = ----------- (1)
Voc x isc

Vpp x ipp
Conversion efficiency = ---------- x 100% (2)
10.4 (mW/cm2)

Where Vpp, ipp, Voc and isc are the potential at power point, current at power point, open circuit voltage and short circuit current, respectively.

The observed convesion effinciency (0.16 percent) was determind with a tungsten lamp of 200 W (as light source), which has light intensity around 15 times less than direct sunlight. Therefore, convesion efficiency has experimentally been observed as 2.4 percent.
The investigated electrochemical device is advantageous with respect to charging time (2 hrs), storage capacity (42.0 min) and better electrical output than devices reported so far.</sup>