Fuel Cell Electrode Metal Sheet With Through-Holes
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Solution Overview
Problem
Existing alkaline fuel cells face issues with expensive and inefficient electrodes made of conductive metal meshes, which suffer from irregular catalyst distribution and electrical resistance due to wire-to-wire contacts, leading to sealing problems and inefficient energy conversion.
Innovation Solution
The development of electrodes comprising a metal sheet with through-holes and a fluid-permeable layer of fibrous or particulate conductive material, bonded to the metal sheet, providing better electrical conduction, uniform catalyst distribution, and improved mechanical stability, with a gas-permeable layer that ensures intimate contact between the liquid electrolyte and gas phase for efficient electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conductive metal mesh is used as the electrode, then mechanical strength is provided, but electrical resistance increases due to wire-to-wire contact points
Solution Approach 1:
The invention extracts the wire-to-wire contact structure from the electrode design by replacing the mesh with a planar metal sheet containing through-holes. This eliminates the inherent resistance problems at wire intersections while preserving the mechanical support function through the solid sheet structure.
Solution Approach 2:
The metal sheet is designed with through-holes that allow electrolyte penetration while maintaining a continuous solid structure for electrical conduction. This porous configuration provides both mechanical strength and uniform electrical properties without the resistance issues of wire contacts.
2Strength
If a metal mesh is used as the electrode, then structural support is achieved, but catalyst distribution becomes irregular
Solution Approach 1:
The invention removes the three-dimensional wire mesh structure and replaces it with a two-dimensional planar sheet with through-holes. This simplification creates a uniform substrate that enables consistent catalyst deposition across the entire electrode surface, eliminating irregular distribution patterns.
Solution Approach 2:
The planar metal sheet with uniformly distributed through-holes provides a homogeneous substrate for catalyst deposition. The uniform geometry ensures consistent catalyst distribution and performance across the electrode area, unlike the irregular wire intersections of mesh structures.
3Strength
If the metal mesh extends to the edge of the electrode, then mechanical integrity is maintained, but sealing problems occur due to fluid flow through the mesh
Solution Approach 1:
The metal sheet with controlled through-holes provides a selective permeability solution. The holes allow necessary electrolyte flow through the electrode while the continuous metal structure prevents unwanted fluid bypass and maintains sealing integrity at the electrode edges.
Solution Approach 2:
The electrode combines the metal sheet structure with additional layers (such as porous coatings or sealant materials) to create a composite structure that simultaneously provides mechanical strength, controlled permeability, and effective sealing at the edges.
4Productivity
If a fluid-permeable layer is added to the metal sheet, then gas-liquid contact is improved, but device complexity increases
Solution Approach 1:
The invention merges the structural support function of the metal sheet with the fluid permeability function of the porous layer into a single integrated electrode assembly. The through-holes in the metal sheet directly facilitate electrolyte access to the catalyst layer, combining mechanical and transport functions.
Solution Approach 2:
The metal sheet with through-holes serves multiple functions simultaneously: providing mechanical strength, enabling electrical conduction, facilitating electrolyte flow, and supporting catalyst deposition. This multi-functionality reduces the need for separate components and simplifies the overall electrode design.
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
This design enhances electrical conduction, provides uniform current distribution, and improves mechanical stability, ensuring efficient energy conversion and reducing sealing issues, while maintaining the structural integrity and durability of the fuel cell.
Implementation Method 1
a fluid-permeable layer of fibrous and/or particulate electrically-conductive material which is bonded to the sheet of metal
Implementation Method 2
which comprises catalytic material... to enable the electro-chemical reactions to occur between the gas and liquid phases
Implementation Method 3
a fluid-permeable layer of fibrous and/or particulate electrically-conductive material which is bonded to the sheet of metal, in electrical contact with the sheet of metal
Data Source
AI summary
A liquid electrolyte fuel cell comprises means to define an electrolyte chamber (208), and two electrodes (10), one on either side of the electrolyte chamber (208), each electrode comprising:—a sheet (11) of metal through which are defined a multiplicity of through-holes (14), and—a gas-permeable layer (16) of fibrous and/or particulate electrically-conductive material which is bonded to and in electrical contact with the sheet of metal (11), and which comprises catalytic material (18). The electrode (10) may be arranged such that the gas-permeable layer (16) faces the electrolyte chamber (208).