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This paper reports the investigations on the optimization of nanostructured TiO₂ with respect to optimum photoelectrode area for modular design of photoelectrolysis cell. This was done for determining the electrode area for optimum electrical output and hydrogen production rate. The nanostructured TiO₂ has been formed by hydrolysis of titanium tetraisopropoxide Ti[OCH(CH₃)₂]₄ followed by the deposition with spin on technique. The photoelectrochemical cell having nanostructured TiO₂ photoanode of several geometric areas, namely, 0.21, 0.50, 0.72, 1.47 and 1.85 cm ², were fabricated and characterized. It has been found that the photoanode area corresponding to optimum electrical output and hydrogen production rate corresponds to ∼0.5 cm ².