Graphene oxide (GO) was prepared using a modified Hummers approach, and deposited by electrostatically assembly technique onto protonated indium-tin oxide (ITO) coated glass substrate. The thus-formed GO thin film was characterized by using UV-visible absorption spectroscopy and scanning electron microscopy. The GO coated ITO electrode in 0.1 mol•L^－1 Na₂SO₄ was also subjected to photoelectrochemical studies, and was found to exhibit stable cathodic photocurrent density of 3.72 μA/cm² under white light irradiance of 100 mW/cm² and －0.4 V bias voltage.

Key words: graphene oxide, self-assembled film, photoelectrochemical property