Abstract
Nanostructured thin films of hematite doped with different concentrations of ruthenium were grown on fluorine doped tin oxide glass substrates using the aqueous chemical growth method. On further heat treatment at 500 ∘C the structures morphed into hematite nanorods (NRs). The Ru concentration in the NRs was controlled by varying the Ru concentration in the RuCl 3⋅H2O precursors. Scanning Electron Microscopy confirmed the formation of the hematite nanorods, while. X-ray diffraction and Mossbauer spectroscopy (MS) data provided clear evidence of the crystallinity of the nanorods and incorporation of ruthenium in the hematite nanorod structure. The band gap of the Ru-doped hematite NRs, estimated from UV-Vis optical absorption intensity vs photon energy curves, were found to be directly related to the Ru concentration. For concentrations in the range 6–30 mg the band gaps are in the range well suited to drive the water splitting process in a photoelectrochemical cell without application of an external bias.
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