Elastic Cathode Gas Diffusion Layer for Hydrogen Pump
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Solution Overview
Problem
Existing electrochemical hydrogen pumps face challenges in inhibiting the increase of contact resistance between the cathode catalyst layer and the cathode gas diffusion layer, particularly under high pressure conditions, leading to inefficiencies and potential damage due to the complexity and cost of additional components required for pressure management.
Innovation Solution
The electrochemical hydrogen pump design incorporates an elastic cathode gas diffusion layer that deforms to maintain contact with the cathode catalyst layer, eliminating the need for dedicated pressing members and optimizing the configuration to ensure uniform pressure and reduced contact resistance, with features such as higher rigidity on the separator side and higher porosity on the catalyst side to enhance gas permeability and contact tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing section is added to press the cathode feeder to the electrolyte membrane, then the contact resistance between the electrolyte membrane and cathode feeder is reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The cathode gas diffusion layer is designed to automatically press itself against the cathode catalyst layer through elastic recovery force, eliminating the need for external pressing sections. The layer deforms elastically under compression and recovers to maintain continuous contact, making the system self-regulating without additional components.
Solution Approach 2:
The cathode gas diffusion layer's physical parameters are optimized by controlling its compression rate and elastic recovery characteristics. By adjusting the compression rate to be within a specific range, the layer maintains appropriate contact pressure without requiring external pressing mechanisms, thus reducing device complexity while ensuring reliable electrical contact.
2Reliability
If the cathode gas diffusion layer is highly compressed to maintain contact, then the contact resistance decreases, but the gas permeability and porosity are reduced
Solution Approach 1:
The compression rate of the cathode gas diffusion layer is precisely controlled within an optimal range during operation. This parameter optimization ensures that the layer maintains sufficient compression to ensure good electrical contact with the catalyst layer, while simultaneously preserving enough porosity and gas permeability for effective hydrogen gas transport.
Solution Approach 2:
The cathode gas diffusion layer is designed with elastic properties that allow it to dynamically adjust its compression state. The layer can deform under compression to maintain contact and then recover elastically to restore gas permeability, creating a dynamic balance between contact resistance and gas transport requirements.
3Reliability
If additional pressing components are added to maintain contact under high pressure, then the contact resistance stability improves, but the manufacturing cost increases
Solution Approach 1:
The system uses the cathode gas diffusion layer's own elastic recovery force to maintain contact under high pressure conditions, eliminating the need for external pressing sections. This self-service mechanism reduces manufacturing complexity and cost while ensuring reliable electrical contact stability during high-pressure operation.
Solution Approach 2:
The operational parameters are optimized by controlling the compression rate of the cathode gas diffusion layer within a specific range. This parameter control allows the layer to maintain stable electrical contact under high pressure without requiring additional pressing components, thereby reducing manufacturing costs while ensuring operational reliability.
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 effectively inhibits the increase in contact resistance, maintains efficient operation under high pressure, and simplifies the configuration, reducing costs and operational inefficiencies compared to prior art.
Implementation Method 1
a cathode gas diffusion layer disposed to project from the recess portion in a thickness direction before fastening of the laminated body by the fastener
Implementation Method 2
a voltage is applied between an anode and a cathode of the MEA, and high-pressure hydrogen gas (cathode gas) is thereby generated on a cathode side of the MEA
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(d)
AI summary
An apparatus (100) includes: an electrolyte membrane (14); a cathode catalyst layer (15) provided to one main surface of the electrolyte membrane (14); an anode catalyst layer (16) provided to the other main surface of the electrolyte membrane (14); a cathode gas diffusion layer (31A) provided on a main surface of the cathode catalyst layer (15) not facing the electrolyte membrane (14); a separator (31B) including a recess through which cathode gas flows; an anode gas diffusion layer (24) provided on a main surface of the anode catalyst layer (16) not facing the electrolyte membrane (14); a voltage applicator (19) applying a voltage between the cathode catalyst layer (15) and the anode catalyst layer (16); and a fastener (27) fastening a laminated body. The cathode gas diffusion layer (31A) is accommodated in the recess, projects from the recess in a thickness direction before fastening of the laminated body, and includes an elastic member (37) between side surfaces of the cathode gas diffusion layer (31A) and of the recess.