Rutile Ir-Ta-Ru Oxide Catalyst for Stable Oxygen Evolution
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Solution Overview
Problem
Existing oxygen evolution reaction catalysts, particularly those containing iridium, face challenges in stability during repeated reversal events and are scarce, leading to high costs, and there is a need for catalysts that can improve the stability of membrane electrode assemblies in fuel cells.
Innovation Solution
A ternary oxide catalyst comprising iridium, tantalum, and ruthenium with a crystalline rutile structure and specific lattice parameters is developed, offering improved stability and reduced iridium usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing oxygen evolution reaction catalysts containing iridium are used, then catalytic activity is achieved, but stability during repeated reversal events deteriorates and cost increases due to iridium scarcity
Solution Approach 1:
The patent applies composite materials by creating a ternary oxide catalyst comprising iridium, tantalum, and ruthenium in a rutile structure. This composite approach combines multiple metals to achieve synergistic effects where the ternary combination provides both enhanced stability during voltage reversal events and maintained catalytic activity while reducing overall iridium content compared to conventional binary or pure iridium catalysts
Solution Approach 2:
The patent applies parameter changes by optimizing the specific composition ratios of iridium, tantalum, and ruthenium within the ternary oxide, as well as controlling the rutile crystal structure parameters. By adjusting these compositional and structural parameters, the catalyst achieves improved stability and activity performance while reducing iridium loading
2Quantity of substance
If iridium content is reduced to lower cost, then cost decreases, but catalytic activity and stability may deteriorate
Solution Approach 1:
The ternary oxide composite compensates for reduced iridium content through the synergistic contribution of tantalum and ruthenium. The specific combination creates a material where the collective properties exceed the sum of individual components, maintaining catalytic performance despite lower iridium loading
Solution Approach 2:
The patent applies local quality by creating specific active sites within the ternary oxide structure where the arrangement of iridium, tantalum, and ruthenium atoms creates localized regions with enhanced catalytic properties. This allows efficient catalysis to occur at specific sites rather than requiring uniform high iridium content throughout the entire catalyst material
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ternary oxide catalyst provides enhanced stability and activity in membrane electrode assemblies while minimizing iridium content, outperforming binary mixed metal oxide catalysts.
Implementation Method 1
Electrocatalysts are used to promote the electrochemical oxidation of the fuel at the anode and the electrochemical reduction of oxygen at the cathode
Data Source
AI summary
The present invention provides an oxygen evolution reaction catalyst, wherein the oxygen evolution reaction catalyst is an oxide material comprising iridium, tantalum and ruthenium: wherein the oxygen evolution catalyst comprises a crystalline oxide phase having the rutile crystal structure; wherein the crystalline oxide phase has a lattice parameter a of greater than 4.510 Å.