Improved photocathodic performance in Pt catalyzed ferroelectric BiFeO3 films sandwiched by a porous carbon layer

A porous carbon layer was inserted between a BiFeO3 film and a Pt catalyst for efficient solar water splitting. A photocathodic current density of −235.4 μA cm−2 at 0 V versus RHE and an onset potential of 1.19 V versus RHE were obtained under 100 mW cm−2 Xe-lamp illumination.