Which material is typically used for the electrodes in a hydrogen-oxygen fuel cell?

In hydrogen-oxygen fuel cells, porous carbon is typically used for the electrodes because it offers a large surface area, which improves the efficiency of the electrochemical reactions occurring at the electrodes. The porous structure allows for better interaction with the hydrogen and oxygen gases, facilitating the efficient formation of water and electricity during the reaction. Additionally, porous carbon is chemically stable and conductive, making it an ideal choice for the anode and cathode in fuel cells.

While metallic wires might conduct electricity well, they do not serve as active sites for the reactions necessary in the fuel cell. Graphite, although somewhat conductive and used in some applications, does not provide the same level of efficiency or surface area as porous carbon in this specific context. Plastic composites do not have the necessary properties for facilitating the electrochemical processes and are not suitable for use as electrodes in fuel cells.