Binder-Free AEM Electrolyser for Hydrogen Production
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Solution Overview
Problem
Existing hydrogen production methods, particularly anion exchange membrane (AEM) and proton exchange membrane (PEM) electrolysers, face challenges with the addition of binders and ionomers, which increase costs and can reduce durability and conductivity, limiting the efficient production of hydrogen using renewable energy.
Innovation Solution
An AEM device is designed with at least one half-cell being ionomer-free and/or binder-free, utilizing an anion exchange membrane between anodic and cathodic half-cells, powered by renewable energy, and using a water-containing liquid with a mild to strong alkaline solution, such as KOH, to facilitate hydrogen and oxygen production without the need for platinum group metals, and incorporating non-stoichiometric transition metal oxides as catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binders and ionomers are added to the membrane electrode assembly, then mechanical strength and conductivity are improved, but costs increase and durability may be reduced
Solution Approach 1:
The patent removes binders and ionomers from the membrane electrode assembly, extracting the problematic components that cause cost increases and potential durability issues while maintaining the essential functionality of the electrolyser through alternative design approaches
Solution Approach 2:
The patent applies different properties to different parts of the system by using a three-layer membrane structure where only specific layers contain functional materials, allowing the removal of binders and ionomers from certain regions while maintaining performance in critical areas
2Strength
If binders and ionomers are added to the membrane electrode assembly, then mechanical strength is improved, but durability may be reduced
Solution Approach 1:
The patent removes binders and ionomers from the membrane electrode assembly, extracting the problematic components that cause cost increases and potential durability issues while maintaining the essential functionality of the electrolyser through alternative design approaches
Solution Approach 2:
The patent applies different properties to different parts of the system by using a three-layer membrane structure where only specific layers contain functional materials, allowing the removal of binders and ionomers from certain regions while maintaining performance in critical areas
3Quantity of substance
If ionomers are added to the membrane electrode assembly, then catalyst layer thickness is increased, but conductivity may be reduced
Solution Approach 1:
The patent removes ionomers from the membrane electrode assembly, eliminating the component that creates the trade-off between catalyst layer thickness and conductivity by using a binder-free design with alternative catalyst support structures
Solution Approach 2:
The patent applies different properties to different parts of the system by using a three-layer membrane structure where only specific layers contain functional materials, allowing the removal of binders and ionomers from certain regions while maintaining performance in critical areas
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 configuration enhances the mechanical stability and efficiency of hydrogen production, reduces the reliance on costly materials, and allows for the generation of high-purity hydrogen at elevated pressures, while maintaining the integrity of the electrode assembly and ensuring intimate contact between the catalyst and membrane.
Implementation Method 1
AEM and PEM electrolysers are reliant on the transfer of ions from one half-cell to the other for the generation of hydrogen. AEM systems rely on the movement of hydroxide ions, OH−
Implementation Method 2
Electrolysers are devices used for the generation of hydrogen and oxygen by splitting water
Implementation Method 3
The addition of binders serves to maintain the integrity of the electrode assembly, whereas ionomers help to increase, in the absence of a liquid electrolyte, available catalyst layer thickness working as a solid electrolyte and helping to create triple phase boundary sites by forming agglomerates of substrate, the ionomer and electrocatalyst
Data Source
AI summary
This invention relates to a device for the electrolytic production of hydrogen and oxygen from a water-containing liquid, the device comprising: an anodic half-cell (3) and a cathodic half-cell (4), with an anion exchange membrane (9) situated between the two half-cells. The electrodes (7, 8) of the half-cells (3, 4) and the anion exchange membrane (9) form a membrane/electrode assembly (MEA). There is also provided means (2) for feeding the water-containing liquid to only one of the anodic half-cell (3) and the cathodic half-cell (4), wherein the electrode in the other, substantially dry, half-cell is ionomer-free and/or binder-free.