A titanium or titanium alloy material for a separator of a polymer electrolyte fuel cell having high contact conductivity with carbon and high durability, and including an oxide film formed on a titanium or titanium alloy substrate by a stabilization treatment performed after a passivation treatment, and one or more kinds of conductive materials selected from carbide, nitride, carbonitride, and boride of tantalum, titanium, vanadium, zirconium, and chromium, the conductive materials being dispersed in the oxide film and having a major axis diameter of from 1 nm to 100 nm. A contact resistance value with a carbon paper is 20 m.OMEGA.cm.sup.2 or less at a surface pressure of 10 kgf/cm.sup.2 before and after an accelerated deterioration test in which the titanium or titanium alloy material is immersed in a sulfuric acid aqueous solution having an adjusted pH of 4 at 80.degree. C. for four days.
A mobile object comprising: a fuel cell; an cabin that is separated from an installing space where the fuel cell is located; an air conditioning device performs an air conditioning of the cabin; a controller controls an operation of the air conditioning device; and a gas concentration detection unit that is installed in the installing space and detects a concentration of gas of a same type as fuel gas supplied to the fuel cell. The controller switches an operation mode of the air conditioning device to an internal air circulation mode from another mode when the concentration of the gas is equal to or higher than a predetermined upper-limit threshold.
A method for controlling an external electric power supply system supplying electric power from a fuel cell and a secondary battery mounted on a vehicle to an external load, the method including controlling electric power from the fuel cell and the secondary battery such that externally supplied electric power supplied to the external load is equal to or less than supply allowed electric power, and setting the supply allowed electric power to be equal to or less than a smaller one of an upper limit value of electric power which the secondary battery is charged with set in accordance with a temperature, and an electric power storage amount of the secondary battery and an upper limit value of electric power discharged from the secondary battery set in accordance with the temperature and the electric power storage amount of the secondary battery.
The invention relates to a fuel cell (10) comprising a membrane electrode assembly (16) and two gas diffusion layers (14) co-operating with the assembly to form a unit cell (12). The fuel cell (10) also has a two-phase thermal diffuser (24) having a condensation zone and an evaporation zone, the evaporation zone being arranged between the bipolar plates (14) of two adjacent unit cells (12). The two-phase thermal diffuser (24) also has a heating element arranged in the condensation zone. The invention also provides a system comprising the fuel cell and a controller, and it also provides a method of regulating the temperature of the fuel cell.
Fuel cell arrangement having an improved efficiency. The arrangement comprises one or more fuel cell units 110 and a methanation unit 200 and a control unit 300. The fuel cell unit comprises a water inlet 111, a hydrogen outlet 112 and an oxygen outlet 113. The methanation unit comprises a catalyst 222, a hydrogen inlet 213, a carbon oxide inlet 214 having a first controllable valve 215 and a methane outlet 216, wherein the hydrogen outlet of the first fuel cell unit is coupled to the hydrogen inlet of the methanation unit, and the methanation unit is adapted to convert hydrogen and carbon oxide into methane, wherein the control unit is adapted to control the first controllable valve so as to obtain an optimum converting process to convert hydrogen and carbon oxide into methane.
A fuel cell having an air electrode provided on one surface of a solid oxide electrolyte layer; a fuel electrode on the other surface thereof; and a separator 11 on the air electrode. A middle layer is further provided between the separator and the air electrode in order to suppress the diffusion of constitutional elements of the air electrode to the separator.
A fuel cell according to one mode includes a plate-like interconnector having a front surface and a back surface; a single cell having a power generation function; a gas chamber provided between the interconnector and the single cell; and one or more gas inlet ports for causing a fuel gas to flow into the gas chamber, the fuel cell further including a buffer chamber provided between the gas inlet ports and the gas chamber; a flow direction changing portion provided between the buffer chamber and the gas chamber so as to be located corresponding to the gas inlet ports, the flow direction changing portion having at least one of a front surface and a back surface, and a side surface; and a fuel gas path provided on at least one of the front surface side and the back surface side of the flow direction changing portion.
In order to make a power generation quantity of a cell for fuel cell increase in a short time when a drop in moistness of the cell causes the power generation quantity of the cell to decrease, a cathode of the cell includes a conductive material, catalyst, and ionomer which covers the conductive material and catalyst. If an output voltage value of the cell is lower than a predetermined threshold voltage value and an electrical resistance value of the cell is higher than a predetermined threshold resistance value, control for increasing an oxidizing gas amount which increases an amount of oxidizing gas sent to the cell is performed.
A fuel cell system and a method of controlling the fuel cell system are provided. The fuel cell system includes at least one bypass valve that is disposed between a passage in an inlet of a fuel cell stack and a bypass passage that is branched from the passage within the inlet and that is connected to a discharge port of the fuel cell stack. In addition, a controller bypasses air supplied from an air blower to the discharge port by adjusting an opening degree of the bypass valve.
A fuel cell system includes an air supply unit for supplying air containing oxygen to a fuel cell stack. A humidifier humidifies the supplied air. An air supply line is connected between a cathode inlet of the fuel cell stack and the humidifier to supply the humidified air to the fuel cell stack. A cathode-side exhaust line is connected between a cathode outlet of the fuel cell stack and the humidifier to supply a cathode exhaust gas discharged from a cathode of the fuel cell stack to the humidifier for humidification in the humidifier. A unified valve module includes a bypass line connected between the air supply line and the cathode-side exhaust line and an outward discharge port discharging the cathode exhaust gas to outside, and controls a gas flow between the humidifier and the fuel cell stack and between the bypass line and the outward discharge port.