FUEL CELL OR ELECTROLYSER

A fuel cell or an electrolyser includes at least one electrode and at least one polymer electrolyte membrane. The electrode includes a catalyst system comprising a carrier metal oxide and a catalyst material. The catalyst material is formed by an electrically conductive metal phosphate in the form of a metaphosphate of the general chemical formula Me(PO), where Me=metal, z=valency of the metal Me, and n is within the range of 1 to 10.