Electrodes:
* Platinum (Pt): The most common catalyst used in fuel cells. It is highly effective in accelerating the electrochemical reactions at the anode and cathode.
* Palladium (Pd): Used as a catalyst for the oxidation of hydrogen at the anode.
* Nickel (Ni): Can be used as a less expensive alternative to platinum, although it is less efficient.
* Other precious metals: Iridium, ruthenium, and rhodium are sometimes used in combination with platinum to improve performance and reduce cost.
Other components:
* Stainless steel: Used for the cell's frame, housing, and other structural components.
* Titanium (Ti): Used in the bipolar plates for its corrosion resistance and good conductivity.
* Copper (Cu): Used for electrical connections and current collectors.
* Aluminum (Al): Used in the fuel cell stack and for structural support.
* Carbon (C): Used as a support material for the catalysts and in the diffusion layer of the membrane electrode assembly (MEA).
Membrane:
* Nafion: A type of perfluorinated sulfonic acid polymer that acts as the electrolyte, allowing protons to pass through while blocking electrons.
The specific metals used in a hydrogen fuel cell can vary depending on the design and application. Research is ongoing to find more cost-effective and durable materials for use in fuel cells.
