A new quaternary oxide, Li2CuMo2O8, was synthesized by the solid-state reaction between corresponding oxides and characterized by chemical analysis, X-ray diffraction, electrical conductivity, diffuse reflectance spectra and magnetic study. It crystallizes in tetragonal symmetry with lattice parameters, a(0) = 16.658 Angstrom and c(0) = 26.914 Angstrom. It is an n-type semiconducting material having bandgap of 1.54 eV. Magnetic susceptibility measurement indicate that the compound is anti-ferromagnetic having C-m = 3.707 and q(a) = -15. The material in the form of hydrogen-annealed pellet was used as a photoanode in electrochemical photovoltaic (ECPV) cell. Flat band potential was located at -0.43 V. ECPV cell parameters such as conversion efficiency (eta) and fill factor were found to have values as 0.81% and 0.397, respectively. (C) 2002 Elsevier Science B.V. All rights reserved.