Highly corrosion resistant platinum-rhodium alloy coating and its photocatalytic activity

• Published in: Inorganic chemistry communications Vol. 134; p. 109065
• Main Authors: Devendra, Bharath K., Praveen, B.M., Tripathi, V.S., Nagaraju, G., Nagaraju, D.H., Nayana, K.O.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2021
• Subjects: Corrosion; Dye degradation; Platinum-Rhodium; SEM; SS304; XRD; Dye degradation; SEM; XRD; Corrosion; Platinum-Rhodium; SS304
• DOI: 10.1016/j.inoche.2021.109065
• ISSN: 1387-7003

[Display omitted] •The Platinum-Rhodium metal was coated on SS304 successfully by DC and PC method.•Electrochemical Impedance Spectroscopy tells about corrosion studies and significant for PC coated samples.•The prepared samples were effectively used for MB dye degradation by photocatalysis method.•PC coated with 75% duty cycle gives 97% efficiency. A method of electroplating a platinum–rhodium (Pt-Rh) alloy coating with a specified composition on a metal substrate stainless steel (SS304) is presented in this article. The Pt-Rh bath consists of [Pt (NH3)2]HPO4, H2SO4 and Rh2(SO4)3. The Pt-Rh alloy electrodeposition coatings were characterized by different analytical methods such as Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). SEM images justify that coating is uniform in a 75% duty cycle. Energy Dispersive X-Ray Spectroscopy (EDX) confirms the presence of Pt and Rh in the coating. XRD confirms that crystalline size was reduced from 75% duty cycle to the rest of the PC’s coatings and DC (Direct current). The incorporation of the Pt-Rh metal ions was verified by EDX analyses. The corrosion behaviour of the developed Pt-Rh alloy coatings was evaluated in 0.1 M Na2SO4 solution using potentiodynamic polarization and electrochemical impedance techniques. The coating developed at PC-75% duty cycle possesses the highest corrosion resistance. A photocatalytic degradation study of Pt-Rh coating was conducted for Methylene Blue (MB) dyes under UV light radiation. The dye removal efficiency of Pt-Rh coated samples was 97% after irradiation and PC 75% duty cycles showed an exceptional dye degradation percentage compare to the DC coating source. All photocatalytic behaviour was controlled by using a UV–Vis spectrophotometer.