Ru+Ir coated titanium electrode

Product Introduction

The electrolysis principle of ruthenium-iridium-titanium anodes involves electrochemical reactions and is commonly used in electrochemical cells or electrolytic tanks. The main anode reaction is chlorine evolution.

The following are the main electrochemical reactions of ruthenium-iridium-titanium anodes during electrolysis:

1. Reaction Equation:

Chlorine Evolution Reaction: 2Cl⁻ - 2e⁻ → Cl₂↟

Conditions: The ruthenium-iridium-titanium anode will undergo chlorine evolution in hydrochloric acid environments and in electrolytes with high chloride ion content, such as those used in the electrolysis of seawater or brine.

Reaction Principle: In the electrolytic tank, when current flows through the electrolyte, the coating on the surface of the ruthenium-iridium-titanium anode catalyzes the loss of electrons from chloride ions, thereby producing chlorine gas. This reaction has important industrial applications, such as in the chlor-alkali industry where saturated brine is electrolyzed to produce chlorine gas and caustic soda. Chlorine gas can be used to produce various chemical products such as plastics, rubber, and pharmaceuticals.

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Technical Specifications

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Advantages：

1. Superior Electrocatalytic Activity

Rhenium (Ru): Ruthenium oxide (RuO₂) exhibits extremely high chlorine evolution catalytic activity, significantly reducing the overpotential of the chlorine evolution reaction and improving electrolysis efficiency. For example, in the chlor-alkali industry, ruthenium-iridium-tantalum coated titanium anodes can increase chlorine yield by more than 20% while reducing energy consumption.

Iridium (Ir): Iridium oxide (IrO₂) provides excellent oxygen evolution catalytic activity and chemical stability, especially in strongly acidic and alkaline environments. For example, in water electrolysis for hydrogen production, ruthenium-iridium-tantalum coated titanium anodes can maintain stable operation at high current densities (>1000 A/m²).

Synergistic Effect: The combination of ruthenium and iridium achieves an optimal balance in the chlorine and oxygen generation reaction, ensuring both chlorine evolution efficiency and improved oxygen evolution stability.

2. Superior Corrosion Resistance

Titanium Substrate Protection: Titanium readily forms a dense oxide film in oxidizing media. Combined with coating protection, it can operate stably in corrosive environments such as acidic, alkaline, and high-salt conditions. For example, in a 3.5% NaCl solution, the corrosion rate can be as low as 0.01 mm/year.

Resistant to Halogen Ion Attack: In seawater desalination or seawater electrolysis for chlorination, the coating resists the attack of halide ions such as Cl⁻ and Br⁻, making it an ideal electrode material for seawater environments.

3. Long Lifespan and Low Maintenance Costs

Coating Stability: The coating is formed through multiple coating-sintering processes using thermal decomposition, resulting in uniform thickness (typically 5-20 μm), strong adhesion, and resistance to peeling. For example, in the chlor-alkali industry, the service life of ruthenium-iridium-tantalum coated titanium anodes can reach over 6 years, far exceeding that of traditional graphite anodes (8 months).

Reusable Substrate: The titanium substrate can be reused repeatedly, further reducing long-term costs. For example, in the electroplating industry, substrate repair can restore performance and extend the overall service life.

High Temperature Resistance and Thermal Shock Resistance: The coating remains stable at high temperatures, making it suitable for high-temperature electrolysis applications such as molten carbonate fuel cells.

4. Uniform Current Distribution: Combined with coating optimization, an inter-electrode spacing error of <0.5mm can be achieved, ensuring coating uniformity (±2μm).

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Applications

Chlor-alkali industry: Used for the electrolysis of brine to produce chlorine (Cl₂) and sodium hydroxide (NaOH). The Ru-Ir coating exhibits high selectivity and low overpotential for the chlorine evolution reaction, significantly improving current efficiency and reducing energy consumption.

Sodium hypochlorite generator: Prepares sodium hypochlorite (NaClO) on-site through the electrolysis of low-concentration brine for water disinfection, wastewater treatment, and sterilization in food processing.

Seawater electrolysis for chlorination: Used in coastal power plants, LNG terminals, and desalination plants. Electrolysis of seawater inhibits biofouling; the Ru-Ir coating exhibits stability in chloride-containing environments.

Industrial circulating water descaling: Combines electrolytic chlorination with oxidation to control microbial growth and scaling. Suitable for cooling towers, central air conditioning systems, etc.

Wastewater treatment: Direct oxidation to degrade recalcitrant organic matter (such as pharmaceutical intermediates and dyes); Indirect oxidation to generate active chlorine (such as HClO) for decolorization, disinfection, and mineralization of pollutants. Electrolytic copper and aluminum foil formation: Serving as the anode in metal deposition or surface oxidation processes, requiring high stability and conductivity.

PCB horizontal copper plating: Acting as an insoluble anode in printed circuit board electroplating to ensure uniform plating.

Food and fruit/vegetable sterilization equipment: Using electrolysis to generate strong oxidizing substances to kill surface microorganisms, ensuring food safety.

Be used in a wide range of industries.

 

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Electrolytic copper foil manufacturing industry

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Hydrometallurgy industry

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Sewage treatment industry

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Cyclone electrolysis industry

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Etching liquid electrolysis recovery industry

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Electrolytic sodium hypochlorite industry

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Customizable Content

Shape and Structure: Can be processed into: plates, pipes, rods, wires, mesh, barrels, and irregular shapes, etc.

Size Specifications: Length, width, thickness, diameter, hole diameter, and other specific dimensions can be customized according to customer drawings or parameters.

Coating Formulation and Thickness:

Coatings are typically a Ru-Ir noble metal oxide mixture system, with adjustable proportions to optimize chlorine evolution activity or corrosion resistance.

Coating thickness is generally 8–15 micrometers, with some processes allowing for thicknesses above 8 micrometers.

High-end customization can utilize gradient coatings (such as high iridium content on the surface and intermediate transition layers) to improve lifespan and stability.

Base Material: Commonly used is TA1 (Gr1) industrial pure titanium. Other titanium alloys can also be selected based on corrosion resistance requirements. Application-Adaptive Design
Electrode structure and coating characteristics can be optimized for different scenarios (e.g., electrolytic chlorination, fruit and vegetable disinfection, circulating water descaling, cathodic protection, electrolytic copper foil, etc.).

Processing and Delivery Methods

OEM/ODM customization is supported, including welding, end-processing, and packaging.

Small batch orders are generally acceptable; some suppliers offer sample customization services.

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Contact Details

For more information or to request a quote, please get in touch with us:

• Email: Jolina@bjhyti.com
• Phone Number: +86-18691787097