Preparation and Characterization of Mixed Metal Oxides Coatings on Titanium Substrate

Abdel-Aziz, A.B.; Bekhit, Samah M.; El Nashar, R.M.; Heakal, F. El-Taib; Ghayad, I.M.

doi:10.21608/ejchem.2024.295803.9830

	Preparation and Characterization of Mixed Metal Oxides Coatings on Titanium Substrate
Egyptian Journal of Chemistry
Volume 68, Issue 3, March 2025, Page 399-407 PDF (581.48 K)
Document Type: Original Article
DOI: 10.21608/ejchem.2024.295803.9830
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Authors
A.B. Abdel-Aziz ¹; Samah M. Bekhit²; R.M. El Nashar³; F. El-Taib Heakal³; I.M. Ghayad ²
¹October High Institute for Engineering & Technology, Giza 12596, Egypt.
²Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
³Chemistry Department, Faculty of Science, Cairo University, 12613 Giza, Egypt.
Abstract
RuO2-IrO2-TiO2 and RuO2-IrO2-TaO2-TiO2 are the most common mixed metal oxide (MMO) coatings coated on Ti substrates. MMO-coated titanium substrates serve as anodes in brine electrolyzers, which employ highly concentrated brine (33% NaCl) to generate chlorine gas and sodium hydroxide. These MMO electrodes were deposited using precursors that included ruthenium trichloride trihydrate (RuCl3.3H2O), diammonium iridium hexachloride [(NH4)2IrCl6], tantalum pentachloride (TaCl5), and titanium trichloride (TiCl3). Highly effective RuO2-IrO2-TiO2 and RuO2-IrO2-TaO2-TiO2 MMO coatings with the appropriate chemical composition were achieved. Both electrodes performed efficiently and showed high stability in the accelerated stability test, while tantalum in the coating composition enhances the MMO coating’s stability.
Keywords
Chlorine evolution reaction (CER); Oxygen evolution reaction (OER); RuO2-IrO2-TiO2; and RuO2-IrO2-TaO2-TiO2 MMO coatings


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