Study of lifetime of Platinum Modified Metal Oxides Electrodes

Pt, IrO2, RuO2, Pt-IrO2 and Pt-RuO2 electrodes have been shown to be effective in their application in various fields. However, it is necessary to study their long-term stability. So, our objective is to prepare them and study their lifetime using intensiostatic measurement. Then they were prepared at 400 °C on titanium plates used as a substrate. Physical measurements (scanning electron microscopy) of these anodes revealed that their surface are rough and porous structures. Lifetime study was carried out in H2SO4 9 N and under a current density of 410 mA /cm2. The long-term stability of Pt improved when coupled to IrO2 in contrast to RuO2. From this study, the performance of the electrode was found to increase in the order: RuO2 < Pt-RuO2 < Pt < Pt-IrO2 < IrO2. For RuO2 and IrO2 pure electrodes, the deactivation would be due to the dissolution of precursors deposited on the titanium. For the Pt pure electrode, deactivation would be due to the detachment of platinum coating. The deactivation of the Pt-IrO2 and Pt-RuO2 electrode would be due, on the one hand to the platinum detachment from IrO2 or RuO2 and on the other hand to the metal oxides (IrO2 or RuO2) dissolution.Keywords: Electrodes, platinum, metal oxides, lifetime.

Producing Platinum Resistant Nanolayer by Electrodeposition Method and Investigation of its Behavior in Acidic and Chloride Media

The purpose of this study is obtaining resistant platinum coating in acidic and chloride media. In this regard, gold coating as an interlayer coated on copper substrate was selected as the most beneficial substrate for platinum plating according to the study among different substrates. In this study, Chronoamprometry (constant potential) method was conducted as the electrodeposition process and scanning electron microscope (SEM) images were utilized to investigate the coating morphology. Cyclic voltammetry (CV) tests were performed in the hydrochloric acid bath to check the durability and stability of the resultant pt. coating. The results show that the resistant platinum coating has been obtained.

Making an ultralow platinum content bimetallic catalyst on carbon fibres for electro-oxidation of ammonia in wastewater

Conductive high surface area carbon fibres with a bimetallic copper–platinum coating are used as electrode for electro-oxidation of wastewater ammonia. The metal alloy is presented as a novel inexpensive catalyst for the generation of hydrogen gas.