Gas-Diffusion Electrode with Reinforced Sintered Layer
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Solution Overview
Problem
Existing gas-diffusion electrodes lack sufficient mechanical characteristics to withstand hydraulic heads in industrial electrolysis cells, leading to limitations in delimiting narrow gap chambers and withstanding pressures, which complicates cell design and increases energy consumption.
Innovation Solution
A gas-diffusion electrode with a sintered and cast conductive powder/fluorinated binder composition is laminated onto a reinforcement member, providing a high elastic modulus that allows the electrode to operate as a self-standing member capable of withstanding high hydraulic heads and delimiting finite gap chambers without additional spacers, using materials like expanded metal, metal foam, or carbon cloth that can withstand the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If gas-diffusion layers are made thin to reduce resistance and improve gas transport, then electrochemical performance is improved, but mechanical strength and dimensional stability deteriorate
Solution Approach 1:
The patent applies composite materials by combining a thin gas-diffusion layer (5-50 μm) made of conductive powder and binder with a reinforcement member (carbon paper, metal mesh, or foam). This composite structure maintains the thinness required for low resistance and good gas transport while the reinforcement member provides the necessary mechanical strength and dimensional stability.
Solution Approach 2:
The patent uses a thin film approach for the gas-diffusion layer, making it as thin as 5-50 μm to minimize resistance and maximize gas transport efficiency. The thin film is then supported by a reinforcement member to compensate for the loss of mechanical strength, allowing the electrode to maintain both high electrochemical performance and adequate structural integrity.
2Device complexity
If gas-diffusion electrodes are made without spacers to simplify cell design, then device complexity is reduced, but ability to withstand hydraulic head deteriorates
Solution Approach 1:
The patent creates a self-supporting composite electrode structure where the reinforcement member (carbon paper, metal mesh, or foam) integrated with the gas-diffusion layer provides sufficient mechanical strength to withstand hydraulic heads of industrial electrolysers without requiring additional spacers, thereby simplifying cell design while maintaining pressure resistance.
Solution Approach 2:
The gas-diffusion electrode becomes self-supporting through the integrated reinforcement member, eliminating the need for separate spacers and support structures. The electrode structure serves its own mechanical support function, allowing it to withstand hydraulic pressure and define the electrode gap independently.
3Productivity
If gas-diffusion layers are made brittle to achieve low porosity and high density, then gas transport efficiency is improved, but ease of manufacture and handling deteriorates
Solution Approach 1:
The patent combines a dense, low-porosity gas-diffusion layer (optimized for gas transport efficiency) with a flexible reinforcement member to create a composite that is both highly efficient and easy to handle. The reinforcement member compensates for the brittleness of the dense gas-diffusion layer, making the overall structure manageable during manufacturing and installation.
4Strength
If reinforcement members are added to improve mechanical strength, then structural integrity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The reinforcement member serves multiple functions simultaneously: it provides mechanical strength and dimensional stability, acts as a current collector, and serves as a support structure. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity despite the addition of the reinforcement member.
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 gas-diffusion electrodes exhibit enhanced stiffness and dimensional definition, enabling them to withstand hydraulic heads exceeding 20 kPa and maintain structural integrity under pressure, reducing the need for additional spacer elements and enhancing energy efficiency in electrochemical processes.
Implementation Method 1
the laminated gas-diffusion layer/reinforcement member assembly having a longitudinal (in-plane) elastic modulus between 15,000 and 120,000 MPa
Implementation Method 2
a thin porous gas-diffusion layer, equipped with hydrophobic paths for gas transport across its thickness
Implementation Method 3
a sintered and cast conductive powder/fluorinated binder composition
Data Source
AI summary
The invention relates to a gas-diffusion electrode provided with a sintered and cast gas-diffusion layer having a high elastic modulus. The electrode is useful as hydrogen-consuming anode or oxygen-consuming cathode of depolarised electrolytic cells such as electrowinning, chlor-alkali or electrodialysis cells.