- noun a device that converts the chemical energy of a fuel and an oxidant to electrical energy
- Cell that uses hydrogen as a fuel source through a catalytic process, producing electricity and giving off heat and small amounts of hot water as by-products. The heat can be captured for space heating needs, and the electricity generated can provide for power needs (referred to as co-generation).
- A cell which converts chemical energy into electrical energy, and whose reactants are continuously replenished by external reservoirs. A phosphoric acid fuel cell, for instance, utilizes hydrogen and oxygen as the reactants, has carbon electrodes, a phosphoric acid electrolyte, and a platinum catalyst. The products of such a cell are electricity, heat, and water.