TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The fuel cell system further comprises a gas/liquid separator for obtaining hydrogen generated from the fuel cell stack after reaction. The heating unit is connected to the anode of the fuel cell stack by a hydrogen supplying line. It comprises a hydrogen combustor for heating fuel and air supplied to the fuel cell stack into a proper level by using hydrogen generated from the anode after reaction; and a fuel kit for supplying fuel powder to a fuel tank before operating a fuel cell to increase temperature of fuel by using heat generated when fuel powder is mixed with water stored in the fuel tank of the fuel supplying unit; and a thermoelectric module for heating fuel supplied from the fuel tank of the fuel supplying unit to the anode of the fuel cell stack. The hydrogen combustor comprises a housing for respectively passing fuel supplied to the anode of the fuel cell stack and air supplied to the cathode; a blowing fan installed at the housing for blowing external air into the housing; and a heating generating unit installed in the housing and for heating fuel and air that pass through inside of the housing by generating heat after reaction with hydrogen generated from the anode of the fuel cell stack. A fuel pipe through which fuel passes is arranged as a coil form and an air pipe through which is passes is arranged as a coil form in the housing. The fuel and air pipes are separated from each other using a division body. The fuel pipe is disposed inside the division body thus to directly receive heat generated from the heat generating unit. The air pipe is disposed outside the division body thus to indirectly receive heat generated from the heat generating unit. One end portion of the fuel pipe is connected to a fuel inlet. Another end portion of the fuel pipe is connected to a fuel outlet. The fuel inlet is disposed at an upper side of the housing. The fuel outlet is disposed at a lower side of the housing. The fuel inlet and the fuel outlet are respectively disposed at the upper side of the housing. The blowing fan is rotatably installed at a lower portion of the housing. Exhaustion holes for exhausting air that has finished a heating operation while passing through the housing outwardly are formed at an upper portion of the housing. The blowing fan uses electric energy generated from the fuel cell stack as a power source. The heat-generating unit is provided with a catalyst attached to inside of the heat-generating unit. It is formed to introduce oxygen-including air blown by the blowing fan thus to generate heat in accordance with the hydrogen, the oxygen and the catalyst reciprocally react. The catalyst is formed as a honeycomb type. An igniter for igniting is installed at one side of the catalyst. The heat generating unit is connected to the hydrogen supplying line thus to be provided with hydrogen from the gas/liquid separator. The hydrogen combustor is provided with a controller for maintaining temperature of the heated air and fuel as a proper level and thus supplying to the fuel cell stack. The controller comprises a temperature sensor installed at one side of the hydrogen combustor for detecting temperature of the hydrogen combustor; a hydrogen supply amount controller installed at the hydrogen supplying line for controlling a hydrogen amount supplied to the hydrogen combustor; and a controller for controlling the hydrogen supply amount controller according to a signal applied from the temperature sensor. The fuel kit comprises a container for storing fuel powder, and an open/close unit installed at an inlet of the container for opening the inlet of the container at the time of supplying the fuel powder to the fuel tank. The open/close unit comprises a cap body mounted at the inlet of the container and provided with a valve seat; a valve plate contacting the valve seat or separated from the valve seat for performing an open/close operation; a stopping plate connected with the valve plate for separating the valve plate from the valve seat when the fuel kit is mounted at the fuel tank; and a spring installed between the stopping plate and a lower surface of the valve seat for providing an elasticity force by which the valve plate is adhered to the valve seat. An upper surface of the fuel tank is provided with a fuel-supplying unit into which the cap body is inserted and at which the stopping plate is stopped for supplying fuel stored in the fuel kit into the fuel tank. The fuel-supplying unit is protruding from the upper surface of the fuel tank as a cylindrical shape. A stopping surface for stopping the stopping plate is formed at an upper surface of the fuel-supplying unit. A supply hole tot which fuel power is supplied is formed at the stopping surface. The valve plate is preferably formed as a "V" shape to be easily adhered to the valve seat. The stopping plate is provided with penetration holes for passing fuel power at a circumference of the stopping plate. The spring is preferably a coil spring installed between an upper surface of the stopping plate and a lower surface of the valve seat. A blade for well mixing fuel powder with water when fuel powder is supplied into the fuel tank from the fuel kit is installed at one side of the fuel tank. It is rotatably installed at a lower portion of the fuel tank and connected with a driving motor for generating a driving force by a rotation shaft. A heating container contacting the thermoelectric module and for heating fuel by a heat emitting operation of the thermoelectric module is installed at the fuel supplying line. A cooling container for cooling fuel and a fuel filter for filtering sodium boron oxide (NaBO2) crystallized in the cooling container are installed at a fuel recycling line (28) for recycling fuel into the fuel tank from the fuel cell tank. The cooling container is provided with a low temperature ceramic board of the thermoelectric module thus to be cooled by a heat absorbing operation of the thermoelectric module. The fuel filter comprises a case mounted at the fuel recycling line that connects the cooling container and the fuel tank; and a filtering net installed in the case and for filtering crystallized NaBO2.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The fuel powder is mixed between sodium hydroxide and boron hydride (BH4).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The fuel powder is mixed between sodium hydroxide and boron hydride (BH4).