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The three spinels ZnFe₂O₄, ZnFeGaO₄ and ZnGa₂O₄ were synthesised by conventional solid state reaction method. ZnFeGaO₄ has unit cell parameter between the parent spinels and shows appreciable absorption in visible light range with a band gap ∼1.9eV. Photocatalytic experiments show that ZnFeGaO₄ has a reasonable hydrogen production rate (∼9μmolh⁻¹/g catalyst) under visible light irradiation (λ≥420nm) but exhibits an improved performance (hydrogen production rate ∼971μmolh⁻¹/g catalyst) compared with parent ZnFe₂O₄ compound (hydrogen production rate ∼861μmolh⁻¹/g catalyst) under full range irradiation (λ≥250nm). The photo-electrodes prepared by electrophoretic deposition of spinel powders onto the fluorine doped tin oxide glass showed a clear impedance response under irradiation. Introducing Ga into the ZnFe₂O₄ structure seems to enhance the light absorbance in the UV …