POROUS ELECTRODE

"An electrode consisting of a highly porous solid. This is often used in fuel cells with gaseous reactants. In this case, the charge-transfer reaction proceeds mainly at the triple interface formed by the electrode material, the electrolyte, and the gaseous reactant. The pores of the structure are partly filled by the electrolyte and partly by the gas. A porous electrode provides a much larger area for reaction than a solid electrode with the gas bubbled around it. A porous electrode can also be used as a flow-through electrode. "