At present, many research efforts focus on addressing this issue with Si-based photoanodes, which take advantage of silicon earth-abundance, industrial maturity , and high theoretical current density up to 43.7 mA cm -2 . Recent work reported diverse engineering strategies to enhance photoanodes charge separation kinetics, including surface texturing , interface engineering , and co-catalysts loading . Buried homojunction-free photoanodes attracted considerable interest in research as they are an ideal candidate for the renewable hydrogen industry due to a lower manufacturing cost . In this field, the highest reported ABPE value is 3.91% on metal-insulator-semiconductor (MIS) photoanodes, with a stability of 30 hours . Stability is a problem for all Si-based photoanodes, originated by the chemical degradation of Si in alkaline electrolytes and the photo-corrosion of the co-catalyst layer .