Cu₂O is an intrinsic p-type semiconductor with a direct bandgap of 2 eV and its conduction band edge lies 0.7 V negative of hydrogen reduction potential which makes it a promising photocathode for water splitting. This study emphasizes the modification of the surface of Cu₂O thin films to facilitate the separation of photogenerated charge carriers as well as increase the electrode-electrolyte contact area. Mesoporous Cu₂O is realized by holding a thin film of electrodeposited Cu₂O at a positive potential (0.4 V ‒ 1 V vs. Ag/AgCl) in buffered Na₂SO₄ (pH 5) . The treated films are found to have mesoporous structure with 10-30 nm thick flakes on its surface. No phase change is observed in electrochemically treated Cu₂O thin films although the XRD intensities of all peaks are slightly lower indicating material loss. This morphological conversion is attributed to Cu₂O dissolution in acidic media as trace copper ions are detected in the solution. The modified Cu₂O photocathode can lead to a better device performance due to increased surface area and improved charge transport.