Gas-Barrier Layer for Alkaline Electrolysis Cell
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Solution Overview
Problem
Alkaline electrolysis cells face performance degradation due to hydrogen gas penetration through the separating membrane, leading to component deterioration and reduced efficiency, which is currently addressed by adding redundant inert gases, compromising cell efficiency.
Innovation Solution
Incorporating a gas-barrier layer on the surface of the reduction electrode or within the ion exchanging porous membrane, containing catalysts like Pt, NiSe, or CoP, to oxidize hydrogen gas and prevent its penetration to the oxidation electrode, thereby maintaining hydrogen concentration and enhancing cell durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inert gas such as nitrogen or argon is used to prevent hydrogen gas penetration, then hydrogen penetration is prevented, but device complexity increases and electrolysis efficiency deteriorates
Solution Approach 1:
The harmful function of inert gas (blocking hydrogen) is extracted and transferred to a gas-barrier layer formed on the separating membrane or electrode surface. This layer contains catalyst particles that selectively oxidize hydrogen, removing the harmful effect while eliminating the need for redundant inert gas injection systems.
Solution Approach 2:
The harmful hydrogen gas that penetrates through the separating membrane is converted into a beneficial substance (water) through catalytic oxidation in the gas-barrier layer. The hydrogen oxidation reaction produces water and heat, transforming the harmful penetration into a useful function that improves reliability without adding system complexity.
2Reliability
If inert gas is added to prevent hydrogen penetration, then hydrogen penetration is reduced, but electrolysis efficiency decreases
Solution Approach 1:
Instead of using inert gas to block hydrogen (which reduces efficiency), the invention converts penetrating hydrogen into water through catalytic oxidation. This transforms the harmful penetration into a beneficial process that maintains electrolysis efficiency while preventing hydrogen from reaching the oxidation electrode.
Solution Approach 2:
The gas-barrier layer acts as an intermediary between the reduction electrode and oxidation electrode. It contains catalyst particles that mediate the interaction with penetrating hydrogen by oxidizing it, providing a selective barrier that maintains efficiency while preventing harmful hydrogen accumulation.
3Reliability
If a gas-barrier layer with catalyst is formed, then hydrogen oxidation occurs and penetration is prevented, but manufacturing complexity increases
Solution Approach 1:
The gas-barrier layer is formed as a porous coating on the separating membrane or electrode surface. The porous structure allows ionic conductivity to be maintained while providing sufficient surface area for catalyst particles to oxidize hydrogen. This approach simplifies manufacturing compared to creating entirely new barrier materials.
Solution Approach 2:
The gas-barrier layer is a composite structure combining porous support material with dispersed catalyst particles (such as Pt, Pd, or other hydrogen oxidation catalysts). This composite approach allows the layer to simultaneously provide mechanical support, ionic conductivity, and catalytic function, simplifying the overall manufacturing process.
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 gas-barrier layer effectively reduces hydrogen gas penetration, maintaining optimal hydrogen concentration, improving the durability and efficiency of the alkaline electrolysis cell while eliminating the need for redundant inert gas systems.
Implementation Method 1
the gas-barrier layer reacting with hydrogen gas and inducing a hydrogen oxidation reaction
Implementation Method 2
the gas-barrier layer may contain one or more catalysts selected from the group consisting of Pt, NiSe, NiS, NiP, CoSe, CoS, CoP, NiMo, and NiMoCu
Implementation Method 3
an ion exchanging porous membrane that is positioned in the electrolyte
Implementation Method 4
an alkaline electrolysis method uses a solution containing 20 to 30 wt% of KOH or 15 to 20 wt% of NaOH as electrolyte
Data Source
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AI summary
The invention provides an alkaline electrolysis cell and a method for manufacturing the alkaline electrolysis cell. The alkaline electrolysis cell may include: a reduction electrode and an oxidation electrode that are disposed separately from each other; electrolyte formed between the reduction electrode and the oxidation electrode; an ion exchanging porous membrane that is positioned in the electrolyte; and a gas-barrier layer that is formed at least one of a place on a surface of the reduction electrode and a place in the ion exchanging porous membrane. The gas-barrier layer causes hydrogen gas generated at the reduction electrode to be oxidized so as to prevent penetration of the hydrogen gas from the reduction electrode to the oxidation electrode. According to the invention, penetration of hydrogen gas is prevented such that a unit component is prevented from being degraded, and it is possible to improve durability and efficiency of the electrolysis cell.