Abstract: Provided is a synthetic graphite material, in which a size L (112) of a crystallite in a c-axis direction as calculated from a (112) diffraction line obtained by an X-ray wide angle diffraction method is in a range of 4 to 30 nm, a surface area based on a volume as calculated by a laser diffraction type particle size distribution measuring device is in a range of 0.22 to 1.70 m2/cm3, an oil absorption is in a range of 67 to 147 mL/100 g, and a half width ?vG of a peak present in a wavelength range of 1580 cm?1±100 cm?1 is in a range of 19 to 24 cm?1 in Raman spectrum analysis using argon ion laser light having a wavelength of 514.5 nm.

Abstract: Provided is a synthetic graphite material, in which a size L (112) of a crystallite in a c-axis direction as calculated from a (112) diffraction line obtained by an X-ray wide angle diffraction method is in a range of 4 to 30 nm, a surface area based on a volume as calculated by a laser diffraction type particle size distribution measuring device is in a range of 0.22 to 1.70 m2/cm3, an oil absorption is in a range of 67 to 147 mL/100 g, and a nitrogen adsorption specific surface area is in a range of 3.1 to 8.2 m2/g.

Abstract: A synthetic graphite material, in which a size L (112) of a crystallite in a c-axis direction as calculated from a (112) diffraction line obtained by an X-ray wide angle diffraction method is in a range of 4 to 30 nm, a surface area based on a volume as calculated by a laser diffraction type particle size distribution measuring device is in a range of 0.22 to 1.70 m2/cm3, an oil absorption is in a range of 67 to 147 mL/100 g, a spectrum derived from carbon appearing in an electron spin resonance method as measured using an X band is in a range of 3200 to 3410 gauss, and ?Hpp, which is a line width of the spectrum as calculated from a first derivative spectrum of the spectrum at a temperature of 4.8K, is in a range of 41 to 69 gauss.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.

Abstract: A fuel cell system comprising a fuel cell having plural membrane-electrode assemblies and plates, fuel and oxidant humidifiers and heater exchanger. Heat exchange between a supply inlet and discharge outlet is carried out between first and second heat exchange mediums. Fuel gas and oxidant gas are directed to flow parallel to each other in the fuel cell. A circulation path is established through the fuel and oxidant humidifiers and the heat exchanger by interconnection among discharge outlet, heat exchanger, fuel and oxidant humidifiers, and inlet.

Abstract: In a fuel cell stack, gas channels and heat medium channels are disposed on one surface and the other surface of one plate, respectively. Gas channels are disposed on the other plate such that they face the gas channels in the one plate. A gas inlet header is disposed at the upper part of the gas channel in the plate and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water as a heat medium is supplied from a heat medium supply manifold hole to a heat medium inlet header. Water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels by heating the gas inlet header by heat conduction.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack. Gas channels and heat medium channels are disposed on one surface and the other surface of one plate, respectively. Gas channels are disposed on the other plate such that they face the gas channels in the plate. A gas inlet header is disposed at the upper part of the gas channel in the plate and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole to the heat medium inlet header, thereby warming up the same.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.

Abstract: A fuel cell system comprising a fuel cell having plural membrane-electrode assemblies and plates, fuel and oxidant humidifiers and heater exchanger. Heat exchange between a supply inlet and discharge outlet is carried out between first and second heat exchange mediums. Fuel gas and oxidant gas are directed to flow parallel to each other in the fuel cell. A circulation path is established through the fuel and oxidant humidifiers and the heat exchanger by interconnection among discharge outlet, heat exchanger, fuel and oxidant humidifiers, and inlet.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack. Gas channels and heat medium channels are disposed on one surface and the other surface of one plate, respectively. Gas channels are disposed on the other plate such that they face the gas channels in the plate. A gas inlet header is disposed at the upper part of the gas channel in the plate and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole to the heat medium inlet header, thereby warming up the same.

Abstract: In a fuel cell stack, gas channels and heat medium channels are disposed on one surface and the other surface of one plate, respectively. Gas channels are disposed on the other plate such that they face the gas channels in the one plate. A gas inlet header is disposed at the upper part of the gas channel in the plate and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water as a heat medium is supplied from a heat medium supply manifold hole to a heat medium inlet header. Water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels by heating the gas inlet header by heat conduction.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.

Abstract: An objective of this invention is to provide a separator for a fuel cell whereby a fuel, air or cooling water can be evenly and efficiently fed. In a separator for a fuel cell comprising fuel channels 105 in one side and cooling water channels 106 in the other side, the regions where the fuel channels 105 and the cooling water channels 106 are formed rectangular. The fuel gas is fed from a first fuel-feeding manifold 107 and discharged from a first fuel-discharging manifold 109 to the outside of the cell. The cooling water is fed from a first cooling-water-feeding manifold 111 and discharged from a first cooling-water-discharging manifold 113 to the outside of the cell.

Abstract: A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.

Abstract: An objective of this invention is to provide a separator for a fuel cell whereby a fuel, air or cooling water can be evenly and efficiently fed. In a separator for a fuel cell comprising fuel channels 105 in one side and cooling water channels 106 in the other side, the region where the fuel channels 105 and the cooling water channels 106 are formed is rectangular. The fuel gas is fed from a first fuel-feeding manifold 107 and discharged from a first fuel-discharging manifold 109 to the outside of the cell. The cooling water is fed from a first cooling-water-feeding manifold 111 and discharged from a first cooling-water-discharging manifold 113 to the outside of the cell.

Abstract: A polymer electrolyte fuel cell shall be provided such that degradation of the fuel cell due to condensed water can be prevented. A polymer electrolyte fuel cell of the present invention is provided wherein a plate A, a plate B, and a plate C are used; a passage is formed on each of the front and rear sides of each of the above-mentioned plates; a cell D or a permeable film E is interposed between two of the above-mentioned plates; a cell unit is thus formed; a plurality of such cell units are integrally laminated to form a polymer electrolyte fuel cell. Fuel gas and cooling water are caused to flow into a humidifying chamber F to humidify fuel gas. The resulting humidified fuel gas is supplied to a fuel chamber G, and moreover, oxidant gas is supplied to an oxidant chamber, thereby generating electricity.

Abstract: A water-retaining layer is formed to coat the top of ribs of a ribbed plate which is to be disposed, as a component of a polymer electrolyte fuel cell, on at least one surface of a cell which includes an electrolyte membrane and two electrodes disposed on two surfaces of the electrolyte membrane. The water-retaining layer is formed by: generating a mixture by dissolving a resin-carbon mixture into a solvent; applying the mixture using a spray to a surface of the ribbed plate having the ribs; and drying the applied mixture at a certain temperature. The ability to retain water in the water-retaining layer per unit active area of the electrodes is desirably in the range of 0.002 to 0.035 g/cm2, and more desirably, in the range of 0.01 to 0.03 g/cm2.

Abstract: A solid polymer fuel cell which can stably generate electric power for long, because the cell is enabled to uniformly supply a fuel gas to all anodes by means of extended flow passages which are extended from anode-side flow passages and formed on a anode-side plate on the downstream side of the ends of the anodes in the direction of fuel gas flow, a water absorbing means for nearly uniformly performing water absorption, water retention, and drainage on all channels provided at the ends of the extended flow passages, and a selective gas discharging means for discharging a gas more selectively than water on the upstream side of the water absorbing means.