Since 1975
Nearly 50 years manufacturing experiences
Nearly 50 years manufacturing experiences
PEM electrolyzer Main Component
Proton Exchange Membrane : Nafion
Catalyst Layer: Platinum (Pt), Iridium (Ir)
Gas Diffusion Layer: titanium fiber felt
Membrane Electrode Assembly (MEA)
Bipolar Plate: titanium coated pt
In a PEM electrolyzer, the main components from inside to outside include the proton exchange membrane, catalyst layer, gas diffusion layer, and bipolar plate. Among these, the diffusion layer, catalyst layer, and proton exchange membrane together form the membrane electrode assembly (MEA), which is the core area for material transport and electrochemical reactions in the electrolyzer. The characteristics and structure of the MEA directly affect the performance and lifespan of the electrolyzer.
In the MEA, the proton exchange membrane is responsible for conducting protons, the catalyst layer facilitates electrochemical reactions, while the gas diffusion layer ensures uniform distribution of reactants and smooth discharge of products. The bipolar plate guides the current, separates gases, and supports the overall structure of the electrolyzer. The collaboration of these components allows the PEM electrolyzer to efficiently and stably carry out water electrolysis reactions.
The table below outlines the main functions, performance requirements, and materials of the components in a PEM electrolyzer. If you need further information, please contact us at 2001@bjcsty.com.
| Component | Main Function | Performance Requirements | Material/Constituent Equipment |
| Proton Exchange Membrane | Conducts protons, isolates hydrogen and oxygen, prevents gas mixing | High proton conductivity, low gas permeability, chemical stability, mechanical strength | Nafion and other fluorinated polymers |
| Catalyst Layer | Promotes water electrolysis, reduces overpotential | High catalytic activity, stability, good adhesion | Platinum (Pt), Iridium (Ir), or Rhodium (Rh) noble metals |
| Gas Diffusion Layer | Provides uniform reactant transport, supports catalyst layer, conducts electricity, and channels gas flow | Conductivity, gas diffusion, mechanical strength, corrosion resistance | Carbon fiber paper, metal mesh (titanium) |
| Membrane Electrode Assembly (MEA) | Main site for electrochemical reactions, composed of proton exchange membrane, catalyst layer, and diffusion layer | Efficient material transport, high reaction rate, good structural stability | Proton exchange membrane, catalyst layer, gas diffusion layer |
| Bipolar Plate | Conducts electricity, separates anode and cathode gases, supports flow field | Conductivity, corrosion resistance, gas tightness, mechanical strength | Graphite, coated metals (e.g., titanium) |
| Seals | Prevents gas leakage, ensures separation of gases and liquids inside the electrolyzer | Gas tightness, corrosion resistance, chemical stability | Rubber, fluoroelastomer, silicone rubber |
| End Plates | Provides structural support, evenly distributes pressure, ensures tight bonding of electrolyzer components | Mechanical strength, compression resistance | Stainless steel, titanium alloy |
| Current Collector | Collects and distributes current, ensures uniform current distribution across the electrolyzer | High conductivity, corrosion resistance | Metal mesh (titanium, nickel), copper, coated metals |
The cost structure of PEM water electrolyzers is significantly impacted by its core components, each influencing the overall expense, performance, and durability. The bipolar plate (BP) and gas diffusion layer (GDL) make up the largest portions of the stack cost, contributing 51% and 17%, respectively. Due to the oxidative and corrosive operating environment, these components require the use of advanced titanium-based materials with protective coatings, such as platinum (Pt) and gold (Au).
Reducing the overall electrolyzer cost necessitates the development of less expensive alternative materials. In comparison, the proton exchange membrane (PEM) and catalyst represent smaller portions of the total cost, at 5% and 8%, respectively. Additionally, the manufacturing of the membrane electrode assembly (MEA) accounts for roughly 10% of the total cost.
Thus, while enhancing water electrolysis efficiency is important, the greatest cost-saving potential lies in reducing the expense of the BP and GDL through material innovations.
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