摘要:
A fuel cell system, includes: 1) a fuel cell including: i) a fuel electrode to which a fuel gas is supplied, and ii) an oxidant electrode to which an oxidant gas reacting with the fuel gas for a generating operation is supplied; and 2) a fuel gas supplier supplying the fuel gas to the fuel electrode before the fuel cell system is started for the generating operation. A first predetermined pressure Pin1 of fuel gas is determined based on a product which is calculated from the following: i) an allowable volume Vcell for the fuel gas to flow in the fuel electrode, multiplied by, ii) a pressure Pcell of the fuel gas in the fuel electrode.
摘要:
A performance recovery operation for a fuel cell system effectively restores a fuel electrode such that, upon starting or stopping of operation of the fuel cell, both fuel and oxidizing electrodes are disposed in a hydrogen atmosphere and then the fuel electrode is maintained at a higher potential level than in a normal operation.
摘要:
For implementing a stop control which extracts a current from a fuel cell and consumes a cathode side oxygen at a system stop, the current extraction from the fuel cell is ended in a state that a certain quantity of oxygen smaller than when the current extraction is started remains on a cathode side of the fuel cell. With this, the hydrogen movement to the cathode side after the system stop can be effectively suppressed and thereby a cathode internal hydrogen concentration at the system start can be kept low, thus making it possible to properly process the cathode side hydrogen at the system start.
摘要:
A performance recovery operation for a fuel cell system effectively restores a fuel electrode such that, upon starting or stopping of operation of the fuel cell, both fuel and oxidizing electrodes are disposed in a hydrogen atmosphere and then the fuel electrode is maintained at a higher potential level than in a normal operation.
摘要:
At system shutdown, supply of hydrogen to a fuel electrode of a fuel cell stack is stopped, and at the same time dry air is supplied to an oxidant electrode. The dry air is subsequently supplied also to the fuel electrode, and finally the system is shut down. This allows optimal conditioning of a fuel cell at system shutdown, and effectively suppresses deterioration of a proton exchange membrane or a catalyst layer of the fuel cell which is caused at system shutdown as well as during storage. Furthermore, a fuel cell system excellent in safety and the like can be provided.
摘要:
A fuel cell system for removing sulfur compounds adsorbed on the surfaces of a catalyst. The fuel cell system includes a fuel cell in which a plurality of unit cells, each having an electrolyte membrane held between electrode catalyst layers, are stacked, and a control device for recovering catalytic activity of the electrode catalyst layers by increasing an amount of water discharged from the electrode catalyst layers to a predetermined amount or more.
摘要:
A fuel cell (1) comprises a cathode catalyst layer (3) and an anode catalyst layer (4) disposed on each surface of an electrolyte membrane (2), an oxidant gas passage (8) facing the cathode catalyst layer (3), and a fuel gas passage (9) facing the anode catalyst layer (9). The cathode catalyst layer (3) contains a metal catalyst (16). In a region (A), in which the differential electric potential between the cathode catalyst layer (3) and the electrolyte membrane (2) is larger than in another region, the metal catalyst (16) content of the cathode catalyst layer or the specific surface area of the metal catalyst (16) in the form of minute parti
摘要:
A fuel cell which includes: a membrane electrode assembly (7) including an electrolyte membrane (1) and a pair of porous electrodes (3, 5) provided on both sides of the electrolyte membrane (1); and first and second separators (9,11) sandwiching the membrane electrode assembly (7). Each of the first and second separators (9, 11) is formed to have, on its surface opposite to the membrane electrode assembly (1), a gas flow path (17,19) and a rib (21, 23) defining the gas flow path (17, 19). The rib (21, 23) of at least one of the first and second separators (9,11) is provided with a projection (25) for pressing the porous electrode (3, 5).
摘要:
A fuel cell system for removing sulfur compounds adsorbed on the surfaces of a catalyst. The fuel cell system includes a fuel cell in which a plurality of unit cells, each having an electrolyte membrane held between electrode catalyst layers, are stacked, and a control device for recovering catalytic activity of the electrode catalyst layers by increasing an amount of water discharged from the electrode catalyst layers to a predetermined amount or more.
摘要:
A fuel cell comprises a cathode catalyst layer and an anode catalyst layer disposed on each surface of an electrolyte membrane, an oxidant gas passage facing the cathode catalyst layer, and a fuel gas passage facing the anode catalyst layer. The cathode catalyst layer contains a metal catalyst. In a region (A), in which the differential electric potential between the cathode catalyst layer and the electrolyte membrane is larger than in another region, the metal catalyst content of the cathode catalyst layer or the specific surface area of the metal catalyst in the form of minute particles is increased, and thus a deterioration in electric power generation efficiency caused by melting of the metal catalyst due to the large differential electric potential is prevented.