Abstract: An AC component ?I addition unit of a diagnostic device superimposes an alternating current on an output current of a fuel cell. A Zn calculation unit calculates a cell impedance with respect to the alternating current with regard to any of a plurality of cells. A diagnosis unit diagnoses that any cell is subjected to hydrogen deficiency when an absolute value of the cell impedance exceeds (absolute value of a reference impedance+a predetermined value ?). It is diagnosed that any cell is subjected to oxygen deficiency when the absolute value of the cell impedance is smaller than (absolute value of the reference impedance?a predetermined value ?).

Abstract: A fuel cell system, comprising: a fuel cell stack configured to include a plurality of cells; a number “n” of injectors arranged in parallel to supply an anode gas to the fuel cell stack, where the number “n” represents an integral number of not less than 2; a cell voltage meter configured to measure a voltage of at least one cell among the plurality of cells; a pressure gauge configured to measure a supply pressure that is a pressure of the anode gas supplied to the fuel cell stack; and a controller configured to respectively input control signals into the number “n” of injectors by using the voltage measured by the cell voltage meter and the supply pressure measured by the pressure gauge and to control a driving number that denotes a number of injectors to be driven among the number “n” of injectors, wherein when the measured voltage is equal to or higher than a predetermined voltage value, the controller is configured to set a target value of the supply pressure and the driving number according to a requir

Abstract: A measurement error of a water content depends on a phase difference of a low frequency. The low frequency is a lower one of two frequencies in an alternating current signal used for calculating an impedance of a cell. The phase difference is a difference between a phase of a current value of an alternating current signal applied to a fuel cell stack and a phase of a voltage value of output current. The calculated value of the water content is not used when the phase difference of the low frequency indicates that the measurement error may largely fluctuate.

Abstract: 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.

Abstract: A fuel cell system includes: a low-frequency superimposition section superimposing a the low-frequency signal on a fuel cell; and an impedance computation section configured to compute low-frequency impedance of the fuel cell at a time when the low-frequency superimposition section superimposes the low-frequency signal on the fuel cell. The fuel cell system includes: a diagnosing section diagnosing a degree of dryness inside the fuel cell on the basis of low-frequency impedance; and an oxidant gas amount adjustment section configured to adjust an amount of oxidant gas in the fuel cell. The diagnosing section is configured to diagnose the degree of dryness inside the fuel cell on the basis of the low-frequency impedance when the oxidant gas amount adjustment section adjusts the amount of the oxidant gas to be equal to or smaller than a reference gas amount.

Abstract: A fuel cell system operates under at least one of the conditions of no humidity or high temperature, and an operating method thereof, are characterized in that a fuel cell has a fuel gas flow path and an oxidant gas flow path arranged such that fuel gas and oxidant gas flow in opposite directions, a determining apparatus that determines the amount of water near the oxidant gas flow path inlet, and a fuel gas control apparatus which increases the amount of water near the oxidant gas flow path inlet by increasing the fuel gas flowrate and/or reducing the fuel gas pressure if it is determined in the determining apparatus that the amount of water near the oxidant gas flow path inlet is insufficient.

Abstract: A fuel cell system comprises a fuel cell stack, radiator, stack side cooling water passage, radiator side cooling water passage, bypass cooling water passage, deionizer, stack side cooling water pump, and radiator side cooling water pump. The pump are formed from rotary pumps able to change directions and amounts of cooling water discharged by changes of drive speeds. Drive speeds of the pumps are controlled to thereby control an amount of cooling water flowing through the radiator side cooling water passage, an amount of the cooling water flowing through the stack side cooling water passage, and a direction and amount of the cooling water flowing through the bypass cooling water passage.

Abstract: There is provided a fuel cell system comprising a first fuel stack, a first temperature gauge configured to measure a first temperature value, a power generation voltage meter configured to measure a power generation voltage, a cell voltage meter and a controller configured to control a temperature regulating mechanism such as to perform a temperature rise of the fuel cell stack. The controller is further configured to start the temperature rise of the fuel cell stack when a cell voltage is lower than a predetermined voltage value. When at least one of a plurality of time measurement conditions is satisfied after the first temperature value has reached a first reference temperature after a start of the temperature rise, the controller measures a time duration during which a voltage difference by subtracting the cell voltage from an average voltage of cells is maintained to be not greater than a predetermined voltage difference.

Abstract: A fuel cell system, comprising: a fuel cell stack configured to include a plurality of cells; a number “n” of injectors arranged in parallel to supply an anode gas to the fuel cell stack, where the number “n” represents an integral number of not less than 2; a cell voltage meter configured to measure a voltage of at least one cell among the plurality of cells; a pressure gauge configured to measure a supply pressure that is a pressure of the anode gas supplied to the fuel cell stack; and a controller configured to respectively input control signals into the number “n” of injectors by using the voltage measured by the cell voltage meter and the supply pressure measured by the pressure gauge and to control a driving number that denotes a number of injectors to be driven among the number “n” of injectors, wherein when the measured voltage is equal to or higher than a predetermined voltage value, the controller is configured to set a target value of the supply pressure and the driving number according to a requir

Abstract: A fuel cell system, comprising: a fuel cell stack including a stacked body provided by stacking a plurality of cells in a stacking direction; a compressor configured to feed a purge gas to a cathode of the fuel cell stack; a controller configured to control the compressor, such as to perform stop-time purging that purges the cathode of the fuel cell stack when operation of the fuel cell system is stopped; a first temperature gauge configured to measure a first temperature value that reflects temperature of a cell placed near a center in the stacking direction among the plurality of cells constituting the stacked body and to input the measured first temperature value into the controller; and a second temperature gauge configured to measure a second temperature value that reflects temperature of a cell placed near an end in the stacking direction among the plurality of cells constituting the stacked body and to input the measured second temperature value into the controller, wherein the controller is configured

Abstract: A method for producing a catalyst supporting a metal or an alloy on a support, including: independently controlling a temperature of a first supercritical fluid to be first temperature, the first supercritical fluid containing a precursor of the metal or precursor of the alloy that is dissolved in a supercritical fluid; independently controlling a temperature of the support to be a second temperature higher than the temperature of the first supercritical fluid; and supplying the first supercritical fluid controlled to the first temperature to the support, to cause the metal or the alloy to be supported on the support.

Abstract: A fuel cell system comprises a fuel cell stack, radiator, cooling water feed passage, cooling water discharge passage, bypass cooling water passage, deionizer, stack side cooling water pump, radiator side cooling water pump, and bypass cooling water control valve. The radiator side cooling water pump and bypass cooling water control valve are controlled to selectively perform one of a stack flow through mode where cooling water flows through at least the fuel cell stack and a stack bypass mode where cooling water does not substantially flow through the fuel cell stack but circulates through the radiator and the bypass cooling water passage.

Abstract: This electrode for fuel cell comprises: carbon nanotubes; a catalyst for fuel cell supported on the carbon nanotubes; and an ionomer provided to coat the carbon nanotubes and the catalyst for fuel cell, wherein when a length of the carbon nanotubes is represented by La [?m] and an inter-core pitch of the carbon nanotubes is represented by Pa [nm], the length La and the inter-core pitch Pa satisfy two expressions given below: 30?La?240; and 0.351×La+75?Pa?250.

Abstract: A fuel cell system comprises: a fuel cell stack; a cooling water supply pipe as a circulation path for cooling water, connected to a cooling water passage in the fuel cell stack; a radiator arranged in the cooling water supply pipe; a radiator bypass pipe that is arranged in the cooling water supply pipe and used for allowing cooling water to bypass the radiator; a cooling water pump arranged in the cooling water supply pipe; a thermostat valve configured to control the amount of cooling water supplied to the radiator and the radiator bypass pipe depending on temperature; a housing surrounding the thermostat valve; an ion exchanger arranged in the radiator bypass pipe; and an air conditioning apparatus configured to supply a heat medium to the housing.

Abstract: An AC component ?I addition unit of a diagnostic device superimposes an alternating current on an output current of a fuel cell. A Zn calculation unit calculates a cell impedance with respect to the alternating current with regard to any of a plurality of cells. A diagnosis unit diagnoses that any cell is subjected to hydrogen deficiency when an absolute value of the cell impedance exceeds (absolute value of a reference impedance+a predetermined value ?). It is diagnosed that any cell is subjected to oxygen deficiency when the absolute value of the cell impedance is smaller than (absolute value of the reference impedance?a predetermined value ?).

Abstract: A method of producing a fuel cell includes: preparing a plurality of carbon nanotubes that are aligned substantially vertically to a plane of a substrate; supporting an electrode catalyst on the carbon nanotubes; forming an electrode layer by disposing an ionomer formed of a first solid polymer electrolyte on a surface of the carbon nanotubes on which the electrode catalyst is supported; and placing the electrode layer to face an electrolyte membrane formed of a second solid polymer electrolyte, which has a glass-transition temperature lower than that of the first solid polymer electrolyte, and bonding the electrolyte membrane to the electrode layer by applying a pressure higher than 5 MPa between the electrolyte membrane and electrode layer at a temperature that is higher than the glass-transition temperature of the second solid polymer electrolyte and that is lower than the glass-transition temperature of the first solid polymer electrolyte.

Abstract: 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.

Abstract: A fuel cell system comprises a fuel cell stack, radiator, stack side cooling water passage, radiator side cooling water passage, bypass cooling water passage, deionizer, stack side cooling water pump, and radiator side cooling water pump. The pump are formed from rotary pumps able to change directions and amounts of cooling water discharged by changes of drive speeds. Drive speeds of the pumps are controlled to thereby control an amount of cooling water flowing through the radiator side cooling water passage, an amount of the cooling water flowing through the stack side cooling water passage, and a direction and amount of the cooling water flowing through the bypass cooling water passage.

Abstract: A method of manufacturing a fuel cell includes: growing carbon nanotubes substantially perpendicular to a substrate formed by loading a growth catalyst on a base material; arranging the substrate and a polymer electrolyte membrane so as to oppose to each other and combining the carbon nanotubes with the polymer electrolyte membrane; and dissolving and removing part of the substrate by immersing the substrate in a solution which dissolves the substrate, after the carbon nanotubes and the polymer electrolyte membrane are combined.

Abstract: An object is to suppress the dryness at an anode inlet of a fuel cell stack in a case of power generation at a current density of not lower than 1.4 A/cm2 in the fuel cell stack in which a mass of a platinum catalyst per 1 cm2 included in a cathode electrode is not higher than 0.2 mg. This object is achievable by performing at least one of controls of controlling temperature of the fuel cell stack to be not lower than 30° C. and not higher than 65° C., controlling a stoichiometric ratio of a cathode gas to be not lower than 1.0 and not higher than 1.5, controlling an outlet pressure of an anode gas to be not lower than 100 kPa and not higher than 250 kPa and controlling a stoichiometric ratio of the anode gas to be not lower than 1.25 and not higher than 5.