摘要:
A polymer electrolyte fuel cell includes: a sealing structure (9) including a substantially rectangular ring-shaped first gasket portion (9a) and a substantially rectangular ring-shaped second gasket portion (9b), the first gasket portion (9a) being positioned outward of a peripheral portion of a first gas diffusion layer (5) and between a first separator (7) and a first catalyst layer (2) positioned at a peripheral portion of a polymer electrolyte membrane 1, the second gasket portion (9b) being positioned outward of the peripheral portion of the polymer electrolyte membrane (1) and between the first separator (7) and a second separator (8); and at least the first catalyst layer (2), a second catalyst layer (3), and a swellable resin portion (11) formed of a swellable resin whose volume expands when water is added thereto, the swellable resin portion (11) being positioned between the first gasket portion (9a) and the first catalyst layer (2) positioned at the peripheral portion of the polymer electrolyte membrane (1).
摘要:
A polymer electrolyte fuel cell of the present invention comprises a membrane-electrode assembly (5), a first separator (6a), and a second separator (6b); the first separator (6a) having a groove-shaped first reaction gas channel (8) on one main surface of the first separator (6a) which contacts the first electrode (4a) such that a plurality of straight-line-shaped first rib portions (11) run along each other; the second electrode (4b) having a groove-shaped second reaction gas channel (9) on one main surface of the second electrode (4b) which contacts the second separator (6b) such that a plurality of straight-line-shaped second rib portions (12) run along each other; a ratio of a first reaction gas channel width of at least an upstream portion (18b) of the first reaction gas channel (8) with respect to a second rib portion (12) is greater than 0 and not greater than 1.
摘要:
An operation method of a polymer electrolyte fuel cell system including an anode (3) supplied with a fuel gas containing hydrogen, a cathode (4) supplied with an oxidizing gas containing oxygen, and a polymer electrolyte membrane (5) sandwiched between the anode (3) and the cathode (4), comprises supplying to the anode (3) the fuel gas humidified with a higher level than the oxidizing gas to cause the anode (3) to have a humidified state with a higher level than the cathode (4), in start-up of the polymer electrolyte fuel cell system.
摘要:
A polymer electrolyte fuel cell of the present invention includes: a membrane-electrode assembly (5) having a polymer electrolyte membrane (1) and a pair of electrodes (4A and 4B); a first separator (6A) having one main surface on which a groove-like first reactant gas channel (8) is formed so as to bend; and a second separator (6B) having one main surface on which a groove-like second reactant gas channel (9) is formed so as to bend. When viewed in a thickness direction of the first separator (6A), the first reactant gas channel (8) is formed such that a first particular portion (51) of the first reactant gas channel (8) is smaller in width than each of a portion located upstream of the first particular portion(51) and a portion located downstream of the first particular portion(51), the first particular portion (51) being within a region of the electrode (4A) and including a portion where the first reactant gas channel (8) extending from an upstream end thereof first separates from the second reactant gas channel (9).
摘要:
The present invention provides a catalyst-coated membrane and a membrane-electrode assembly that can easily and surely achieve a polymer electrolyte fuel cell having excellent durability, in which the decomposition/degradation of a polymer electrolyte membrane can be suppressed, and a decrease in initial characteristics can be prevented sufficiently for a long period of time even when the polymer electrolyte fuel cell is frequently started and stopped. In the catalyst-coated membrane that includes an anode catalyst layer, a cathode catalyst layer, and a hydrogen ion conductive polymer electrolyte membrane interposed between the anode catalyst layer and the cathode catalyst layer, a peripheral area of at least one of the anode catalyst layer and the cathode catalyst layer is provided with a decrease portion in which the mass of the electrode catalyst per unit area of the catalyst layer decreases from the inner side toward the outer side.
摘要:
A polymer electrolyte fuel cell of the present invention includes a membrane electrode assembly (5) having a pair of electrodes (4a, 4b) sandwiching a portion of a polymer electrolyte membrane (1) which is inward relative to a peripheral portion thereof, a first separator (6a), and a second separator (6b), the first separator (6a) is provided with a first reaction gas channel (8) on one main surface, the second separator (6b) is provided with a second reaction gas channel (9) on one main surface such that the second reaction gas channel (9) has a second rib portion (12), the first reaction gas channel (8) is formed such that a ratio of a first reaction gas channel width of an upstream portion (18b) to the second rib portion (12) is set larger than a ratio of a first reaction gas channel width of a downstream portion (18c) to the second rib portion (12), and the ratio of the first reaction gas channel width of the upstream portion (18b) to the second rib portion (12) is a predetermined ratio.
摘要:
A polymer electrolyte fuel cell of the present invention includes a membrane-electrode assembly (5) and separators (6A, 6B). A plurality of reactant gas channels are formed on a main surface of at least one of the separator (6A, 6B) and a gas diffusion layer (3A, 3B). In a case where among the plurality of reactant gas channels, a reactant gas channel overlapping the peripheral portion of the electrode (4A, 4B) twice is defined as a first reactant gas channel, and a reactant gas channel formed to overlap the peripheral portion of the electrode (4A, 4B) and formed such that the length of a portion overlapping the peripheral portion is longer than a predetermined length is defined as a second reactant gas channel, the second reactant gas channel is formed such that the flow rate of a reactant gas flowing therethrough is lower than that of the reactant gas flowing through the first reactant gas channel or the second reactant gas channel does not exist.