Fuel Cell Catalyst Activation via Cathode Sealing
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Solution Overview
Problem
In fuel cell catalyst activation, air remaining in the air exhaust line can flow back to the cathode electrode, reducing hydrogen cross-leak and cell voltage drop, preventing effective catalyst activation.
Innovation Solution
A method involving sealing the air supply line of the cathode electrode and opening the air exhaust line to the atmosphere, followed by sealing it again to prevent air from flowing back, ensuring a differential pressure for catalyst activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is removed from the cathode electrode temporarily to enable catalyst activation, then catalyst activation can be performed, but air remaining in the air exhaust line may flow back to the cathode electrode, reducing hydrogen cross-leak and preventing effective catalyst activation
Solution Approach 1:
The air exhaust line is sealed in advance before air removal from the cathode electrode to prevent air from flowing back. This preliminary sealing action ensures that when hydrogen cross-leak occurs and cell voltage drops to the reduction potential, the cathode electrode maintains the necessary conditions for effective catalyst activation without air contamination.
Solution Approach 2:
The sealing mechanism acts as an intermediary between the air exhaust line and the cathode electrode, preventing direct communication that would allow air to flow back. This intermediary barrier ensures that the cathode electrode environment remains controlled during the catalyst activation process.
2Quantity of substance
If the air exhaust line remains open during catalyst activation, then air can be removed from the cathode electrode, but air may remain in the exhaust line and flow back, reducing hydrogen cross-leak amount
Solution Approach 1:
The air exhaust line sealing is performed in advance before the catalyst activation process begins. By sealing the exhaust line beforehand, the system ensures that air cannot flow back into the cathode electrode during hydrogen supply, maintaining sufficient hydrogen cross-leak amount for effective activation.
Solution Approach 2:
The air exhaust line is segmented into a sealed portion and an open portion during different stages of the process. During catalyst activation, the exhaust line is sealed to prevent air backflow, while during air removal stages, it remains open. This segmentation allows independent control of air flow paths.
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 method effectively lowers the cell voltage to a reduction potential, allowing for the removal of the oxide film and catalyst activation, ensuring consistent and successful catalyst activation in all fuel cells.
Implementation Method 1
hydrogen is supplied into an anode electrode, air is removed from the cathode electrode, a differential pressure is applied between the anode electrode and the cathode electrode, hydrogen is cross-leaked from the anode electrode to the cathode electrode
Implementation Method 2
the oxide film formed on the surface of the catalyst for the cathode electrode is removed due to a reduction reaction, and catalyst activation for activating the catalyst for the cathode electrode is performed
Data Source
AI summary
A method of activating a catalyst for a fuel cell in order to perform catalyst activation in a cathode electrode of the fuel cell includes a first process in which hydrogen is supplied into an anode electrode, the side of an air supply line of the cathode electrode is sealed, and the side of an air exhaust line of the cathode electrode is opened to an atmosphere, a second process in which the side of the air exhaust line of the cathode electrode is sealed after the first process, and a third process in which catalyst activation is performed in the cathode electrode after the second process.