Porous Electrical Conductor Surface Treatment for Water Electrolysis
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Solution Overview
Problem
Conventional water electrolysis apparatuses face issues with reduced porosity in the surface of porous electrical conductors due to grinding or cutting processes, leading to increased pressure loss, difficulty in oxygen discharge, and elevated electrolysis voltage, which impede efficient hydrogen production.
Innovation Solution
A grinding and etching process is applied to the surface of porous electrical conductors, specifically sintered bodies of spherical titanium particles, to achieve a smooth surface with increased porosity within the range of 10% to 50%, ensuring effective oxygen discharge and sufficient water supply, thereby reducing pressure loss and electrolysis voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a grinding process or cutting process is applied to smooth the surface of a sintered body, then the surface smoothness is improved, but the porosity in the surface is decreased
Solution Approach 1:
The invention changes the surface treatment parameters by introducing an etching process after grinding. The etching process chemically modifies the surface to restore porosity while maintaining the smoothness achieved during grinding. This parameter change (adding etching step) resolves the contradiction by simultaneously achieving both surface smoothness and porosity.
Solution Approach 2:
The etching process acts as an intermediary between the grinding process and the final surface requirement. It mediates the conflict between smoothness and porosity by chemically treating the ground surface to restore the porous structure without removing the smoothness benefit. The etching solution serves as the intermediary agent that reconciles these opposing requirements.
2Shape
If the porosity in the surface is decreased, then the surface smoothness is improved, but the pressure loss in fluid is increased
Solution Approach 1:
The invention changes the surface treatment approach by adding an etching process that restores porosity. This parameter change (from just grinding to grinding+etching) simultaneously achieves surface smoothness and prevents pressure loss by maintaining adequate porosity in the surface layer.
Solution Approach 2:
The invention utilizes porous materials principles by applying an etching process that creates or restores a porous surface structure. This porous surface maintains fluid flow capability (reducing pressure loss) while the underlying smooth structure provides mechanical stability. The porous surface layer acts as a filter that prevents clogging while maintaining flow.
3Shape
If the porosity in the surface is decreased, then the surface smoothness is improved, but the oxygen discharge becomes difficult
Solution Approach 1:
The invention changes the surface treatment parameters by introducing an etching process after grinding. This parameter change restores surface porosity which is essential for oxygen discharge, while the grinding step ensures surface smoothness. The combined process resolves the contradiction between smoothness and oxygen discharge efficiency.
Solution Approach 2:
The invention applies porous materials principles by using an etching process to create or restore a porous surface structure on the power feeding element. This porous surface enables effective oxygen discharge by providing pathways for gas escape, while the smooth underlying structure maintains mechanical integrity. The porous surface prevents oxygen accumulation and ensures efficient discharge.
4Shape
If the surface is ground or cut to smooth it, then the surface finish is improved, but the water supply becomes difficult
Solution Approach 1:
The invention changes the surface treatment process by adding an etching step after grinding. This parameter change restores surface porosity which is crucial for water supply, while the grinding step provides surface smoothness. The combined process resolves the contradiction between surface finish and water supply efficiency.
Solution Approach 2:
The invention utilizes porous materials principles by applying an etching process that creates or restores a porous surface structure. This porous surface enhances water supply efficiency by providing capillary action and adequate pathways for water distribution, while the smooth underlying structure ensures proper sealing and finish. The porous surface prevents water accumulation issues.
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 process enhances the porosity of the surface, improving water supply and reducing the energy required for water pumping, leading to improved energy efficiency and efficient hydrogen production in water electrolysis systems.
Implementation Method 1
subjected to an etching process to have a smooth surface
Implementation Method 2
subjected to a grinding process
Implementation Method 3
Water is supplied to the anode side power feeding element. Therefore, the water is decomposed into hydrogen ions (protons) at the anode of the membrane electrode assembly
Implementation Method 4
The hydrogen ions move toward the cathode through the electrolyte membrane
Implementation Method 5
the electrons flow through an external circuit to the cathode, creating DC electrical energy
Implementation Method 6
The catalyst of the anode induces a chemical reaction of the fuel gas to split the hydrogen molecule into hydrogen ions and electrons
Data Source
AI summary
A water electrolysis apparatus includes a plurality of unit cells. A membrane electrode assembly of the unit cell includes an anode side power feeding element and a cathode side power feeding element stacked on an anode catalyst layer and a cathode catalyst layer on both surfaces of a solid polymer electrolyte membrane. A surface of the anode side power feeding element is subjected to a grinding process, and then, subjected to an etching process to form a smooth surface.