AEM Water Electrolysis Membrane Electrode for Dry Hydrogen Output
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Solution Overview
Problem
Current AEMWE electrolyzers require liquid supply circulation on both anode and cathode sides, leading to mechanical damage, poor long-term stability, and increased hydrogen production costs due to the need for gas-liquid separation and water removal modules, which hinder the production of dry hydrogen.
Innovation Solution
A water electrolysis membrane with hydrophobic anode catalytic layer and anode gas diffusion layer, which includes a hydrophobic anode catalytic layer with a specific raw material ratio and porosity, allowing liquid supply circulation on the anode side to regulate water permeation and enhance gas mass-transfer efficiency, reducing the need for additional separation modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid supply circulation is adopted on both anode and cathode sides, then hydrogen production can be maintained, but hydrogen carries excessive moisture requiring additional gas-liquid separation and water removal modules
Solution Approach 1:
The invention extracts the liquid supply circulation from the cathode side while maintaining it on the anode side. This selective removal eliminates the need for complex gas-liquid separation and water removal modules on the cathode side, while still achieving sufficient water supply for the hydrogen evolution reaction through water permeation from the anode side through the anion exchange membrane.
Solution Approach 2:
The anion exchange membrane acts as an intermediary that enables water permeation from the anode side to the cathode side. This intermediary mechanism allows water to be transported across the membrane without requiring liquid supply circulation on the cathode side, thereby simplifying the system while maintaining hydrogen production.
2Device complexity
If liquid supply circulation is stopped on the cathode side to reduce system complexity, then fewer separation modules are needed, but the diaphragm experiences dry-wet state changes causing mechanical damage
Solution Approach 1:
The invention applies local quality by creating a hydrophobic cathode catalytic layer with specific water contact angle characteristics. This localized hydrophobicity control allows the cathode side to function without liquid supply circulation while preventing excessive water accumulation, thereby maintaining diaphragm stability and preventing mechanical damage from dry-wet state changes.
Solution Approach 2:
The invention changes the water contact angle parameter of the cathode catalytic layer to create hydrophobicity. This parameter change enables the system to operate without cathode side liquid supply circulation by controlling water permeation and retention, thus maintaining diaphragm stability while reducing system complexity.
3Productivity
If water permeation from anode to cathode is increased to supply water for hydrogen production, then hydrogen can be produced more efficiently, but excessive water makes it impossible to obtain dry hydrogen
Solution Approach 1:
The invention applies local quality by creating a hydrophobic cathode catalytic layer with controlled water contact angle. This localized hydrophobicity allows the system to utilize water permeation from the anode side for hydrogen production while preventing excessive water accumulation in the hydrogen gas stream, thereby achieving both high productivity and dry hydrogen output.
Solution Approach 2:
The invention changes the water contact angle parameter of the cathode catalytic layer to optimize water permeation control. This parameter adjustment enables sufficient water supply for efficient hydrogen production while limiting excessive water carryover, achieving the balance between productivity and hydrogen dryness.
4Quantity of substance
If hydrophobic material is added to the anode catalytic layer to control water permeation, then water transport can be regulated, but the catalytic activity may be affected
Solution Approach 1:
The invention uses composite materials by combining hydrophobic materials (such as PTFE) with catalytic materials in the anode catalytic layer. This composite structure allows simultaneous achievement of water permeation control and maintained catalytic activity, as the hydrophobic components regulate water transport while the catalytic components facilitate the oxygen evolution reaction.
Solution Approach 2:
The invention applies local quality by creating regions with different properties within the anode catalytic layer. The hydrophobic regions control water permeation while the catalytic regions maintain high catalytic activity, achieving both water transport regulation and sustained power output for oxygen evolution.
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 solution enables efficient production of dry hydrogen, reduces hydrogen production costs, and promotes the large-scale development of AEMWE by minimizing water content in the produced hydrogen and improving the stability and efficiency of the electrolysis process.
Implementation Method 1
reactant water molecules move from the anode side to the cathode side through permeating the anion exchange membrane
Implementation Method 2
Based on the hydrophobicity of the hydrophobic anode catalytic layer, a permeation amount of water molecules through the hydrophobic anode catalytic layer can be regulated
Implementation Method 3
Anion exchange membrane water electrolysis (AEMWE) technology
Implementation Method 4
anode gas diffusion layer... allowing liquid supply circulation on the anode side to regulate water permeation and enhance gas mass-transfer efficiency
Data Source
AI summary
The present disclosure provides a water electrolysis membrane electrode, a method for preparing the water electrolysis membrane electrode, and a water electrolyzer applying the water electrolysis membrane electrode. The water electrolysis membrane electrode includes a cathode gas diffusion layer, a cathode catalytic layer, an anion exchange membrane, a hydrophobic anode catalytic layer, and an anode gas diffusion layer that are stacked in sequence. Raw materials for preparing the hydrophobic anode catalytic layer include an anode catalyst, a hydrophobic material, and an anode ionomer. A mass ratio of the anode catalyst, the hydrophobic material, and the anode ionomer is 10:1-3:1-3. A porosity of the hydrophobic anode catalytic layer is 10%-40%.