La-Mo oxides were synthesised by heating the powder, obtained from the reaction of lanthanum nitrate with molybdenum carbonyl in organic media, at 573 K for 2 h. The structure, morphology and chemical composition were determined by oxygen determination, atomic absorption spectrometry, X-ray diffraction and scanning electron microscopy. The results showed an amorphous structure. After heating the compound in vacuum, we obtained the X-ray diffraction pattern of La-2(MoO4)(3). The electrochemical behaviour of the La-Mo oxides was determined in KOH 0.5 M. In the range 700-1000 mV vs Hg/HgO/KOH 0.5 M electrode, the results showed a very good performance for the oxygen evolution reaction.