NOVELTY - A plasma reactor (16) to which poly-phase alternating current (AC) is supplied by a power unit (22), forms hydrogen-rich gas from water. A fuel cell (20) generates electricity and water as by-product, from hydrogen-rich gas supplied from plasma reactor. The plasma reaction chamber contains a poly-phase AC electrode to which AC power is supplied, to generate plasma arc in reaction zone for splitting water.    USE - As non-polluting power source for motor vehicles (claimed) and industrial purposes.    ADVANTAGE - Hydrogen-rich gas is instantly formed by the plasma reactor with low power consumption. Electricity generation is efficient and battery-powered vehicles are efficiently driven by this fuel cell system. The power source non-polluting and depletion of fossil fuel is prevented.    DETAILED DESCRIPTION - The high-efficiency fuel cell systems (10) contains reaction zones connected by micro-reaction paths. The micro reaction path consists of a granular catalyst or a mixture of a granular electrode and a granular non-conductor. A rapid cooling unit is arranged in the plasma reactor between the reaction chamber and outlet. A neutral electrode is arranged opposing the poly-phase AC electrode and is connected to the neutral point of electric power unit. A cylindrical electrode is arranged axially, spaced apart from the AC electrode. The neutral electrode is arranged co-centric with the cylindrical electrode. The hydrogen-rich gas is stored in an accumulator arranged between plasma reactor and fuel cell, and a portion of output of reactor is suppled to electric power unit. The by-product water in fuel cell is recirculated to the inlet of the reactor by a water recirculation unit (25). A support battery (24) is connected between the fuel cell and the electric power unit which supplies power to counter electrodes in reaction chamber, between which the micro reaction path is arranged.    An INDEPENDENT CLAIM is also included for a fuel battery-powered moving unit such as vehicle, which consists of a motor and a propulsion unit. A support battery by which the fuel cell is charged, supplies power to the plasma power unit and motor.    DESCRIPTION OF DRAWING(S) - The figure shows the block diagram of structure of battery-powered vehicle. (Drawing includes non-English language text).    Fuel cell system (10)    Water tank (12)    Plasma reactor (16)    Fuel cell (20)    Electric power unit (22)    Support battery (24)    Water recirculation apparatus (25)