Hydrothermal synthesis of heterostructured SnO_2/Sn_3O_4 film and its application in corrosion protection of stainless steel

摘要

We report the synthesis and characterization of an immobilized and heterostructured SnO_2/Sn_3O_4 semiconductor film as a photoanode for corrosion protection of 403 stainless steel (403SS) in a NaCI solution. The film was successfully prepared on FTO conductive glass substrates in an ethanol aqueous solution with SnCl_2, Na_3C_6H_5O_7 and NaOH via a facile hydrothermal method. For the preparation of the film, the solution was transferred to a Teflon-lined stainless steel autoclave after the FTO substrate was placed with the conducting side facing down in the autoclave. The autoclave was sealed and placed in an oven at 180°Cfor 12 h. After the hydrothermal reaction, the autoclave was naturally cooled down to room temperature, and then the FTO substrate attached with SnO_2/Sn_3O_4 film was taken out and rinsed with de-ionized water. The film was characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, UV-visible spectroscopy and photoelectrochemical measurements.