Engineering n-p junction for photo-electrochemical hydrogen production

The generation of hydrogen from water and sunlight offers a promising approach for producing scalable and sustainable carbon free fuels. One of the challenges of solar-to-fuel technology is the design of efficient, long-lasting and low-cost photocathodes, which are responsible for absorbing sunlight and driving catalytic hydrogen evolution. We report on the protection of a Cu/Cu₂O/CuO photoelectrode against photocorrosion by a 200-300 nm-thick BaTiO₃ perovskite layer, deposited using the sol-gel method. This photoelectrode mediates H₂ production with a current density of ∼3.1 mA cm^-2 at 0 V versus RHE under 3 Sun irradiation and in a pH = 6 aqueous electrolyte. While the unprotected Cu/Cu₂O/CuO photoelectrodes show a rapid decay of activity, the BaTiO₃-protected photoelectrodes exhibit ∼10% current decay over 20 min.