MEA (Membrane Electrode Assembly), also known as membrane electrode, is the heart of the fuel cell. The CCM (catalyst coated membrane) and the cathode/anode diffusion layer are the main site of the electrochemical reaction, involving the occurrence of the reaction and the transfer and emission of the products.
Platinum loading
Amount of precious metal platinum per unit active area of fuel cell membrane electrode, in mg/cm2.
Anode-to-cathode leaking rate
Membrane electrode cascade leakage rate is the cascade leakage flow rate of gas from unit area membrane electrode anode to cathode in l-min-1-cm-2 per unit time under a certain pressure difference.
Cell reversal
Fuel cell reverse electrode refers to the phenomenon that when the fuel cell stack is operating. The voltage of that section of the cell is below zero volts due to insufficient anode hydrogen supply. And the anode catalyst performance is severely degraded resulting in output performance degradation.
Cell reversal tolerance
Membrane electrode anti-reverse polarity performance used to evaluate the ability of the membrane electrode performance to remain undiminished when reverse polarity phenomenon occurs in the fuel cell. It is generally characterized by shutdown reverse polarity runtime and nondestructive reverse polarity runtime in minutes.
Duration of cell reversal until cell cutting off
The continuous operation time in minutes from the occurrence of reverse polarity phenomenon in the fuel cell until the fuel cell reaches the cut-off protection voltage and stops.
Duration of cell reversal without performance lose
The continuous reverse polarity operation time in minutes from the occurrence of the reverse polarity phenomenon in the fuel cell to its rated power decay within 4%.
Chemical stability of proton exchange membrane
The resistance of the proton exchange membrane to the strong oxidative environment in the fuel cel the operation of the membrane electrode constrained by the chemical stability decay of the proton exchange membrane from the start-up operation of the fuel cell to the time when the performance drops below the minimum acceptable safety performance Time to evaluate, the unit is hour.
Durability of electrocatalyst
During the operation of the fuel cell, the life of the membrane electrode catalyst is evaluated by the operating time of the membrane electrode restricted by the catalytic activity decay of the catalyst. From the start of the fuel cell to when the performance drops below the minimum acceptable performance, and the unit is hours.
Durability of catalyst support in MEA
The lifetime of the membrane electrode catalyst support (usually a carbon support) during fuel cell operation limited by the corrosion of the catalyst support from the time the membrane electrode starts running the fuel cell until its performance drops below the minimum acceptable performance specified by the supplier. Run time to evaluate, the unit is hour.
Mechanical durability of proton exchange membrane in MEA
The life of the proton exchange membrane under different mechanical stresses determined by the operating time of the membrane electrode. It restricted by the decay of the mechanical properties of the proton exchange membrane. From the time the fuel cell started to run until the performance drops below the minimum acceptable performance specified by the supplier. Evaluation, the unit is hour.
Accelerated stress test and evaluation
By operating under specific extreme conditions, the fuel cell membrane electrode can complete the decay. It may occur during the entire life cycle in a short period of time. And then quickly test the life or durability of the membrane electrode and perform performance evaluation.