Fuel-cells system

A fuel-cells system comprising a fuel cell which receives a supply of gaseous fuel containing at least hydrogen and a supply of oxidizing gas containing oxygen and generates an electromotive force through an electrochemical reaction of the gaseous fuel and the oxidizing gas,

• said fuel-cells system comprising an oxidizing gas supply device for feeding the supply of oxidizing gas to said fuel cell,
• said oxidizing gas supply device comprising:
• a magnetic field generating unit which generates a magnetic field in a space between magnetic poles,
• a gaseous mixture supply unit which feeds a supply of a gaseous mixture containing at least oxygen to said space where the magnetic field is generated by said magnetic field generating unit, and
• a high oxygen-concentration gas production unit which takes a high oxygen-concentration gas from the vicinity of said magnetic poles and feeds the high oxygen-concentration gas to said fuel cell as the supply of oxidizing gas,
• wherein said oxidizing gas supply device further comprises an oxidizing gas compressing unit which pressurizes the oxidizing gas fed to said fuel cell, wherein said oxidizing gas compressing unit comprises a compressor that compresses the gaseous mixture or the high oxygen-concentration gas and is operated by a turbine driven by a high-pressure gas discharged from a constituent of said fuel-cells system, and wherein said magnetic field generating unit generates a magnetic field in a space of said compressor, said gaseous mixture supply unit supplies the gaseous mixture to said space where the magnetic field is generated in said compressor, and said high oxygen-concentration gas production unit feeds the compressed high oxygen-concentration gas, which is taken out of said compressor, to said fuel cell as the supply of oxidizing gas.