Method for Producing Active and Stable Titanium-Based Mixed Oxide Catalysts with Optimized Precious Metal Distribution by Means of Surface-Conformal Atomic Layer Deposition

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This patent describes a method for producing highly active and stable titanium-based mixed oxide catalysts with precisely controlled distribution of precious metals (primarily iridium) using atomic layer deposition (ALD). The invention focuses on fabricating nanostructured electrode coatings by first preparing a titanium-based mixed oxide support containing precious metal(s) and then conformally coating its surface with catalytically active precious metal species using ALD. This results in optimized exposure of catalytic centers at the surface, enhanced electrical conductivity, and improved catalyst efficiency and durability, especially important for processes like water electrolysis.

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• Catalyst materials for electrolytic hydrogen production (water electrolysis)
• Electrocatalysts for fuel cells and electrochemical devices
• Photovoltaic and photo(electro)catalytic applications
• Catalysts for industrial chemical reactions (hydrogenation, alkylation, coupling)
• Electrode materials in energy storage technologies
• Medical devices requiring corrosion-resistant electrodes
• Components in optics and optoelectronics (e.g., sensors, detectors)
• Specialty applications in jewelry requiring stable, precious metal coatings

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• Significant reduction in precious metal usage while maintaining high catalytic activity
• Superior catalyst stability under corrosive and oxidative conditions
• High mass-specific catalytic activity (better efficiency per amount of precious metal)
• Precisely controllable surface properties (thickness, crystallinity, porosity) using ALD
• Ability to design nanostructured, porous catalyst layers for optimized surface area
• Improved economic viability for large-scale hydrogen production and other industrial applications
• Enhanced electrical conductivity of catalyst supports for efficiency
• Versatility in adapting catalyst properties for a wide range of chemical and electrochemical applications

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Patent Abstract

In einem ersten Aspekt betrifft die Erfindung ein Verfahren zur Herstellung nanostrukturierter Elektrodenbeschichtungen. Hierbei wird zunächst ein Trägermaterial bereitgestellt, wobei das Trägermaterial ein Edelmetall-Titan-Mischoxid umfasst. Daraufhin wird das Trägermaterial mit einer katalytisch aktiven Edelmetallspezies mittels Atomlagenabscheidung (ALD) beschichtet, sodass das Trägermaterial durch die katalytisch aktive Edelmetallspezies oberflächenkonform modifiziert wird.Zudem betrifft die Erfindung eine Verwendung des mittels der Atomlagenabscheidung oberflächenmodifizierten Trägermaterials als Katalysator und/oder Katalysatorträger, wobei vielseitige Einsatzmöglichkeiten vorliegen.