Preparing Hematite Nanomaterials for Photo Electrochemical Water Splitting
A new nanostructured α-Fe2O3 photo electrode synthesized through chemical vapor deposition is presented. The α-Fe2O3 films consist of nano platelets strongly oriented perpendicular to the conductive glass surface. This hematite morphology was never obtained before and is strictly linked to the method being used for its production. Structural, electronic, and photocurrent measurements are employed to disclose the nano scale features of the photo anodes and their relationships with the generated photocurrent. α-Fe2O3 films have a hierarchical morphology consisting of nano branches. The process parameters mainly affect the microstructure, the density, the roughness, and the photoelectrochemical (PEC) activity. The highest photocurrent is shown by the photo anodes with the best balance between the platelets density and roughness. The so obtained hematite hierarchical morphology assures good photocurrent performance and appears to be an ideal platform for the construction of customized multilayer architecture for PEC water splitting.
Keywords - Photoanodes, α-Fe2O3 ,CVD process ,photoelectrochemical (PEC) activity.