**2.1 Preparation of TiO2/Zn electrode by spray pyrolysis**

In general the experimental procedure recommended by Beck and Co-workers was adopted for the preparation of TiO2/Zn electrode by spray pyrolysis of TiCl3 by the following procedure [26]. The TiO2 coating was done on zinc substrate which was cleaned well and sand blasted to make the surface adherent for the coating. Etching was done for the same purpose using etchants (5% Oxalic acid in water) at 60o C for 1 hour. The surface was then washed properly with water, rinsed using triple distilled water.

Then it was coated with the precursor solution TiCl3 (0.05 N) 4 ml, 1:1 HNO3 water (2.5 ml). The precursor solution was cooled to 5°C to which isopropyl alcohol (15 ml) was added maintaining the temperature 5 to 10o C.
