Electrochemical Hydrogen Compressor Voltage Control Below Corrosion Potential
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Solution Overview
Problem
The degradation of electrolyte membranes in electrochemical compressors due to metal cation elution caused by corrosion of metallic separators, leading to reduced proton conductivity and hydrogen purity, is a challenge in high-pressure hydrogen gas production for fuel cell vehicles.
Innovation Solution
A compressor design that controls the voltage applied per unit cell to be below the corrosion potential of the metallic anode separator, using a controller to manage voltage application and prevent metal cation elution, thereby reducing membrane degradation and maintaining hydrogen purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic anode separator is used in the electrochemical compressor, then the mechanical strength and structural stability are improved, but the electrolyte membrane degrades due to metal cation elution caused by corrosion
Solution Approach 1:
The patent applies parameter changes by controlling the voltage applied per unit cell to be lower than the corrosion potential of the metallic anode separator. This voltage parameter control prevents the metallic separator from reaching its corrosion potential, thereby preventing metal cation elution and protecting the electrolyte membrane from degradation while still using the metallic separator for its mechanical strength benefits
Solution Approach 2:
The patent implements feedback control through a controller that monitors and adjusts the voltage applied to each unit cell. The controller ensures the voltage remains below the corrosion potential threshold of the metallic anode separator, creating a closed-loop system that prevents corrosion-induced membrane degradation while maintaining compression functionality
2Productivity
If a higher voltage is applied to increase compression efficiency, then the productivity is improved, but the metal cation elution and membrane degradation worsen
Solution Approach 1:
The patent resolves this contradiction by optimizing the voltage parameter within a specific range - high enough to maintain compression efficiency and productivity, but strictly controlled to remain below the corrosion potential threshold. This parameter optimization allows the system to achieve good compression performance without triggering the corrosion mechanism that leads to membrane degradation
Solution Approach 2:
The feedback control system continuously monitors the applied voltage and adjusts it to maintain optimal compression efficiency while preventing voltage from exceeding the corrosion potential. This real-time feedback ensures that productivity requirements are met without compromising membrane stability
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 effectively reduces electrolyte membrane degradation, maintains high hydrogen purity, and enhances the efficiency and reliability of hydrogen compression operations.
Implementation Method 1
a voltage application unit for applying a voltage between the anode and the cathode, wherein the compressor causes, by using the voltage applier to apply a voltage, a proton extracted from an anode fluid supplied to the anode to move to the cathode and generates compressed hydrogen
Implementation Method 2
an electrolyte membrane with less degradation than before
Data Source
AI summary
A compressor includes at least one cell that includes an electrolyte membrane, an anode located on one main surface of the electrolyte membrane, and a cathode located on the other main surface of the electrolyte membrane; a metallic anode separator located on the anode; a cathode separator located on the cathode; and a voltage application unit for applying a voltage between the anode and the cathode, wherein the compressor causes, by using the voltage applier to apply a voltage, a proton extracted from an anode fluid supplied to the anode to move to the cathode and generates compressed hydrogen, and the compressor includes a controller for causing the voltage application unit to apply the voltage such that a voltage applied per unit cell is lower than a corrosion potential of the metallic anode separator.