RuO2 Core Titania Shell Oxygen Evolution Catalyst
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Solution Overview
Problem
Conventional oxygen evolution catalysts, such as iridium oxide, face challenges with high initial cost and low durability, while ruthenium oxide exhibits high initial activity but poor durability, and existing solutions do not adequately address catalyst degradation.
Innovation Solution
An oxygen evolution catalyst is developed with a core of ruthenium oxide or metal ruthenium and a shell of titania or composite titanium-ruthenium oxide, which protects the catalyst surface from degradation and maintains high activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iridium oxide is used as the catalyst, then durability of OER activity is improved, but initial activity is reduced and cost increases
Solution Approach 1:
The patent uses a composite material structure where ruthenium oxide particles are supported on a titania carrier. This composite structure combines the high initial activity of ruthenium oxide with the stability and durability provided by titania, achieving both high productivity and reliability simultaneously. The composite RuO2/TiO2 catalyst maintains catalytic activity while preventing particle aggregation and degradation.
Solution Approach 2:
The titania carrier acts as an intermediary substance that supports the ruthenium oxide particles. This intermediary structure prevents direct contact and aggregation between ruthenium oxide particles, maintaining their dispersion and activity while providing structural stability. The titania mediator enables the ruthenium oxide to function at high activity levels without suffering from aggregation-induced degradation.
2Productivity
If ruthenium oxide is used as the catalyst, then initial activity is improved, but durability of OER activity deteriorates
Solution Approach 1:
The patent creates a RuO2/TiO2 composite catalyst where ruthenium oxide particles are dispersed on a titania support. This composite structure preserves the high initial activity of ruthenium oxide while the titania component provides structural stability and prevents degradation, thereby improving durability without sacrificing productivity.
Solution Approach 2:
The catalyst structure exhibits local quality differentiation where ruthenium oxide particles provide high catalytic activity at specific sites, while the titania carrier provides structural stability and durability in the overall structure. This spatial separation of functions allows each material to optimize its local role, achieving both high activity and durability.
3Productivity
If iridium oxide is deposited on inorganic oxide material with high specific surface area, then aggregation is suppressed and OER activity is improved, but cost increases
Solution Approach 1:
The patent replaces expensive iridium oxide with a cheaper ruthenium oxide-based catalyst system. By using ruthenium oxide supported on titania, the invention achieves comparable or superior performance at lower cost, effectively substituting a costly material with a more economical alternative that maintains the desired functionality.
Solution Approach 2:
The RuO2/TiO2 composite catalyst provides a cost-effective alternative to iridium oxide-based catalysts. The combination of ruthenium oxide and titania achieves high OER activity and durability at lower material cost, making the catalyst economically viable while maintaining technical performance.
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 catalyst achieves initial activity and durability comparable to or exceeding iridium oxide while being less costly, with improved durability through titania coverage that balances activity and resistance to degradation.
Implementation Method 1
a shell covering the surface of the core... the shell includes titania or a composite oxide of titanium and ruthenium... the catalyst surface at which catalyst degradation starts is protected
Implementation Method 2
the core includes ruthenium oxide or metal ruthenium in at least a surface portion... exhibits initial activity and durability equal to or higher than the conventional catalyst using iridium oxide
Data Source
AI summary
An oxygen evolution catalyst includes a core and a shell covering the surface of the core. The core includes ruthenium oxide or metal ruthenium in at least a surface portion. The shell includes titania or a composite oxide of titanium and ruthenium. Such an oxygen evolution catalyst is obtained by (a) dispersing core particles each including ruthenium oxide or metal ruthenium in at least a surface portion in a solvent to obtain a dispersion, (b) adding a Ti source to the dispersion to produce precursor particles in which the surface of each core particle is covered with a titania precursor, and (c) collecting the precursor particles from the dispersion and heat-treating the precursor particles after drying.