Layered Oxygen Evolution Electrode for Longer Iridium Use
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Solution Overview
Problem
Existing electrodes for oxygen evolution in electrolysis processes, particularly those using iridium as an active element, suffer from insufficient service life due to inefficient consumption of iridium, necessitating a solution to extend their operational duration.
Innovation Solution
The electrode design includes a titanium substrate with a first intermediate layer of titanium-tantalum mixed metal oxide, a second intermediate layer of tantalum oxide, and a catalyst layer of iridium-tantalum mixed metal oxide, optionally with a platinum coating, fabricated through methods like arc ion plating and heat treatment to prevent iridium segregation and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a catalyst layer made of mixed metal oxide containing iridium is used, then oxygen evolution reaction efficiency is improved, but service life is insufficient due to inefficient iridium consumption
Solution Approach 1:
The electrode is divided into multiple functional layers: a substrate layer, a first intermediate layer containing titanium and tantalum, a second intermediate layer containing tantalum oxide, and a catalyst layer containing iridium and tantalum. This segmentation allows each layer to perform its specific function optimally while preventing direct contact between iridium and the substrate, thereby extending service life through inefficient iridium consumption patterns.
Solution Approach 2:
The first and second intermediate layers act as intermediary layers between the substrate and the catalyst layer. These intermediate layers prevent direct interaction between the substrate and the iridium-containing catalyst layer, reducing iridium consumption by preventing direct substrate-catalyst contact and thereby extending the electrode's service life while maintaining oxygen evolution efficiency.
2Productivity
If iridium is used as an active element in the catalyst layer, then catalyst activity is enhanced, but material cost increases due to iridium being expensive and rare
Solution Approach 1:
The catalyst layer is designed with specific local composition characteristics, containing iridium and tantalum in a controlled ratio. The intermediate layers are positioned strategically to protect the iridium from excessive consumption. This local quality optimization maintains high catalyst activity where needed while reducing overall iridium consumption, addressing both productivity and material cost concerns.
Solution Approach 2:
The electrode employs a composite structure with multiple layers containing different metal oxide compositions. The catalyst layer uses a composite of iridium and tantalum oxides, while the intermediate layers contain titanium-tantalum and tantalum oxide composites. This composite material approach allows optimization of catalyst activity through iridium-tantalum combination while the overall composite structure reduces iridium consumption through the protective intermediate layers.
3Device complexity
If a simple single-layer electrode structure is used, then manufacturing complexity is reduced, but corrosion resistance and durability are insufficient
Solution Approach 1:
The electrode uses a composite multi-layer structure where each layer provides specific protective or catalytic functions. The substrate provides mechanical strength, the first intermediate layer provides corrosion resistance, the second intermediate layer provides additional protection, and the catalyst layer provides oxygen evolution activity. This composite structure achieves high reliability and corrosion resistance while maintaining reasonable manufacturing complexity through systematic layer formation processes.
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 proposed electrode structure significantly extends the service life by efficiently consuming iridium, maintaining high catalyst activity, and resisting corrosion, making it suitable for long-term electrolysis in acidic conditions.
Implementation Method 1
a first intermediate layer disposed on the substrate and made of a first mixed metal oxide containing titanium and tantalum
Implementation Method 2
fabricated through methods like arc ion plating and heat treatment
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
An electrode for oxygen evolution that can be used for electrolysis over a long period of time by efficiently consuming iridium used as an active element is provided. An electrode for oxygen evolution (10) includes a substrate (2) made of titanium or a titanium alloy; a first intermediate layer (4) disposed on the substrate (2) and made of a first mixed metal oxide containing titanium and tantalum; a catalyst layer (6) disposed above the first intermediate layer (4) and made of a second mixed metal oxide containing iridium and tantalum; and a second intermediate layer (5) disposed between the first intermediate layer (4) and the catalyst layer (6), made of a tantalum oxide, and having a tantalum content of 1.2 to 2.5 g/m2.