Electrolysis Cell Cooling Layout for Oxygen Passage Durability
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Solution Overview
Problem
Members constituting the oxygen flow passage in a water electrolysis cell become oxidized during operation, leading to deterioration and reduced durability.
Innovation Solution
A cooling device is used to cool the hydrogen electrode to a lower temperature than the oxygen electrode, thereby cooling the constituent members of the oxygen flow passage and mitigating oxidation, while maintaining efficient water electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oxygen flow passage is used during water electrolysis, then oxygen can be generated and transported, but the members constituting the oxygen flow passage become oxidized and deteriorate
Solution Approach 1:
The patent applies local quality by creating a temperature differential between different regions of the electrolysis cell. The hydrogen electrode and hydrogen flow passage are maintained at a lower temperature than the oxygen electrode and oxygen flow passage. This localized cooling of the hydrogen side prevents oxidation of members in the oxygen flow passage while allowing oxygen generation to proceed efficiently at the warmer oxygen electrode region.
Solution Approach 2:
The patent changes the temperature parameter distribution within the electrolysis cell. By controlling the temperature of the hydrogen electrode to be lower than the oxygen electrode, the system creates a thermal gradient that protects oxygen flow passage members from oxidation while maintaining oxygen generation efficiency. This parameter change (temperature distribution) directly addresses the oxidation problem.
2Reliability
If the hydrogen electrode is cooled to prevent oxidation, then the temperature of oxygen flow passage members decreases, but the efficiency of water electrolysis may be affected
Solution Approach 1:
The cooling is applied locally to the hydrogen electrode and hydrogen flow passage, not to the entire cell. The oxygen electrode and oxygen flow passage maintain higher temperatures that are favorable for oxygen generation and water electrolysis efficiency. This localized approach allows simultaneous achievement of oxidation prevention and high electrolysis efficiency.
Solution Approach 2:
The patent optimizes the temperature parameter by creating a specific differential between hydrogen and oxygen electrode temperatures. The hydrogen electrode is cooled to a temperature that prevents oxidation, while the oxygen electrode maintains a higher temperature that ensures efficient water electrolysis. This controlled parameter change resolves the contradiction between oxidation prevention and electrolysis efficiency.
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 approach prevents oxidative deterioration of the oxygen flow passage members, maintains sealing properties, and ensures high efficiency of water electrolysis by controlling the temperature differential between the electrodes.
Implementation Method 1
a cooling device that cools the hydrogen electrode such that a temperature of the hydrogen electrode becomes lower than a temperature of the oxygen electrode
Implementation Method 2
When the water electrolysis cell operates, hydrogen is generated in the hydrogen flow passage while oxygen is generated in the oxygen flow passage
Implementation Method 3
Members constituting the oxygen flow passage become oxidized by the oxygen in the oxygen flow passage, resulting in deterioration of these members
Data Source
AI summary
A water electrolysis system having: a membrane-electrode assembly; a first separator in contact with a hydrogen electrode of the membrane-electrode assembly; a hydrogen flow passage provided between the first separator and the hydrogen electrode; a second separator in contact with an oxygen electrode of the membrane-electrode assembly; an oxygen flow passage provided between the second separator and the oxygen electrode; and a cooling device that cools the hydrogen electrode such that a temperature of the hydrogen electrode becomes lower than a temperature of the oxygen electrode.