Porous TiOx Fabric Electrode for Acidic Water Electrolysis
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Solution Overview
Problem
Existing water electrolysis electrodes face challenges in maintaining durability and efficiency in acidic environments due to carbon corrosion and high costs of porous titanium, while existing fabric-based electrodes suffer from reduced performance due to insulating polymers and blocked porosity.
Innovation Solution
A method involving low-temperature carbonization and electroplating of porous fabric materials to create a conductive support, followed by coating with a titanium oxide layer using layer-by-layer assembly or sol-gel methods, and introducing metal catalysts like Pt and Ru to enhance stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If carbon cloth is used as electrode support, then ease of manufacture is improved, but reliability deteriorates due to carbon corrosion at 0.2 V or higher
Solution Approach 1:
The patent replaces expensive and unreliable porous titanium with a cost-effective fabric substrate that undergoes in-situ carbonization during electrolysis operation. The fabric is treated as a temporary support that transforms into a stable carbon structure, eliminating the need for expensive corrosion-resistant materials while maintaining reliability.
Solution Approach 2:
The patent changes the material state from organic fabric to carbonized fabric through thermal treatment and electrochemical processes. This parameter change transforms the electrical conductivity and chemical stability properties, enabling the fabric to withstand acidic environments and high voltages without corrosion.
2Reliability
If porous titanium is used as electrode support, then reliability is improved, but cost increases
Solution Approach 1:
The patent uses inexpensive fabric substrates that are carbonized in-situ during operation, replacing the need for expensive porous titanium. The fabric serves as a temporary support that transforms into a stable conductive structure, significantly reducing material costs while maintaining durability in acidic environments.
Solution Approach 2:
The patent creates a carbonized fabric structure that replicates the functional properties of porous titanium (conductivity, stability, porosity) without using the expensive titanium material. The carbonized fabric copy achieves similar performance characteristics at a fraction of the cost.
3Reliability
If insulating polymer is added to coat catalyst on support, then reliability is improved, but productivity deteriorates due to reduced efficiency
Solution Approach 1:
The patent removes the insulating polymer coating step entirely from the electrode manufacturing process. By eliminating this insulating layer, the patent maintains direct electrical contact between the catalyst and the conductive carbonized fabric, thereby preserving high reaction efficiency while still providing reliability through the stable fabric substrate.
Solution Approach 2:
The patent uses a carbonized fabric support that inherently provides both conductivity and stability, eliminating the need for separate insulating polymer coatings. The carbonized fabric itself serves as the functional support structure, combining the benefits of conductivity and stability without the efficiency penalty of polymer coatings.
4Reliability
If thick coating of precious metal catalyst is applied, then reliability is improved, but productivity deteriorates due to blocked porosity
Solution Approach 1:
The patent applies a thin, uniform layer of precious metal catalyst on the carbonized fabric surface rather than a thick coating. This local quality approach provides sufficient catalytic activity while maintaining the underlying fabric porosity, allowing efficient mass and charge transport without blocking the active sites.
Solution Approach 2:
The patent leverages the porous structure of the carbonized fabric substrate to maintain open pathways for reactant and product transport. The porous structure prevents catalyst layer blockage, ensuring that even with catalyst coating, the porosity remains sufficient for high productivity in water electrolysis reactions.
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 resulting electrodes exhibit high durability and efficiency in acidic conditions with improved charge transfer and active surface area, allowing for efficient hydrogen and oxygen evolution reactions.
Implementation Method 1
heat treating a porous fabric type to carbonize it
Implementation Method 2
electroplating it
Implementation Method 3
coating a titanium oxide layer on the conductive support followed by modifying the surface with an amine (—NH2) material
Implementation Method 4
modifying the surface with an amine (—NH2) material
Implementation Method 5
introducing a water electrolysis catalyst thereafter
Data Source
AI summary
The present invention relates to a fabric-type titanium oxide (TiOx)-based porous water electrolysis electrode, a method for preparing the same, and a water electrolysis device comprising the same.