Abstract: The BiVO4 film electrode exhibited enhanced efficiency and stability in alkali ne solution compared with those in the neutral electrolyte. The cyclic voltammog rams for the intermediates analysis showed that the accumulation of peroxide in terme diates is less in higher pH alkaline solution. However, the water photooxidation mechanism is more complex when a higher bias is applied in the alkaline solutio n.

Key words: bismuth vanadate, water photooxidation, photoelectrochemistry, cyclic voltammogram, photocurrent