A polymer electrolyte fuel cell comprises a fuel cell stack and a humidifier. The fuel cell stack includes plural cells in which each cell has a pair of electrodes and a proton-conductive electrolyte membrane arranged between the pair of electrodes, wherein an oxidant gas or a fuel gas passes throug
A polymer electrolyte fuel cell comprises a fuel cell stack and a humidifier. The fuel cell stack includes plural cells in which each cell has a pair of electrodes and a proton-conductive electrolyte membrane arranged between the pair of electrodes, wherein an oxidant gas or a fuel gas passes through the humidifier before being fed to the fuel cell stack, and wherein a wet gas containing water or water vapor also passes through the humidifier. In the fuel cell, the humidifier includes a porous separating layer and a hydrophilic water-releasing layer, wherein the separating layer is configured to separate the wet gas from the oxidant gas or the fuel gas in the humidifier, and wherein the hydrophilic water-releasing layer is disposed in a side of the oxidant gas or the fuel gas to the separating layer in the humidifier.
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What is claimed is: 1. A polymer electrolyte fuel cell, comprising: a humidifier; and a fuel cell stack, the fuel cell stack including plural cells each containing: a pair of electrodes, and a proton-conductive electrolyte membrane arranged between the pair of electrodes, wherein an oxidant gas or
What is claimed is: 1. A polymer electrolyte fuel cell, comprising: a humidifier; and a fuel cell stack, the fuel cell stack including plural cells each containing: a pair of electrodes, and a proton-conductive electrolyte membrane arranged between the pair of electrodes, wherein an oxidant gas or a fuel gas passes through the humidifier before feeding to the fuel cell stack, and a wet gas containing water or water vapor passes through the humidifier, wherein the humidifier includes a porous separating layer and a hydrophilic water-releasing layer, wherein the separating layer has pores having an average pore diameter of 0.01 to 0.1 μm and is configured to separate the wet gas from the oxidant gas or the fuel gas in the humidifier and allow transit of moisture through the pores in the vapor phase, and wherein the hydrophilic water-releasing layer has pores in which moisture is retained in the liquid phase having an average pore diameter of 1 to 100 μm and is disposed in a side of the oxidant gas or the fuel gas to the separating layer in the humidifier. 2. The polymer electrolyte fuel cell according to claim 1, wherein: a hydrophilic water-absorbing layer is disposed in the other side of the separating layer where the wet gas flows. 3. The polymer electrolyte fuel cell according to claim 2, wherein: the water-absorbing layer has a corrugated structure. 4. The polymer electrolyte fuel cell according to claim 1, wherein: the water-releasing layer has a corrugated structure. 5. The polymer electrolyte fuel cell according to claim 1, wherein the separating layer is selected from the group consisting of a hydrophilic polymer membrane, an ion-exchange resin membrane and a cellulosic sheet. 6. The polymer electrolyte fuel cell according to claim 1, wherein the separating layer the separating layer includes a material having an oxygen-containing functional group on its surface, the oxygen-containing functional groups being selected from the group consisting of hydroxyl groups, carbonyl groups and ether groups. 7. The polymer electrolyte fuel cell according to claim 1, wherein the separating layer has a thickness of 10 μm to 100 μm. 8. The polymer electrolyte fuel cell according to claim 1, wherein the separating layer has a contact angle with a water droplet on its surface of 20 degrees or less. 9. The polymer electrolyte fuel cell according to claim 1, wherein the separating layer has a contact angle with a water droplet on its surface of substantially 0 degrees. 10. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer has a porosity of 50% or more and less than 100%. 11. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer has a porosity of 80% to 90%. 12. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer has a thickness of 1 to 3 mm. 13. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer has a contact angle with a water droplet on its surface of 20 degrees or less. 14. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer has a contact angle with a water droplet on its surface of substantially 0 degrees. 15. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer has a porosity of 50% or more and less than 100%. 16. The polymer electrolyte fuel cell according to claim 1, wherein the hydrophilic water-releasing layer is selected from the group consisting of cellulosic paper containing pulp and an acrylic resin. 17. A polymer electrolyte fuel cell, comprising: a humidifier; and a fuel cell stack, the fuel cell stack including plural cells each containing: a pair of electrodes, and a proton-conductive electrolyte membrane arranged between the pair of electrodes, wherein an oxidant gas passes through the humidifier before feeding to the fuel cell stack, and a cathode exhaust gas exhausted from the fuel cell stack to passes through the humidifier, wherein the humidifier includes a porous separating layer and a hydrophilic water-releasing layer, wherein the separating layer has pores having an average pore diameter of 0.01 to 0.1 μm and is configured to separate the cathode exhaust gas from the oxidant gas and allow transit of moisture through the pores in the vapor phase, and wherein the hydrophilic water-releasing layer has pores in which moisture is retained in the liquid phase having an average pore diameter of 1 to 100 μm and is disposed in a side of the oxidant gas to the separating layer in the humidifier. 18. The polymer electrolyte fuel cell according to claim 17, wherein: a hydrophilic water-absorbing layer is disposed in the other side of the separating layer where the wet gas flows. 19. The polymer electrolyte fuel cell according to claim 18, wherein: the water-absorbing layer has a corrugated structure. 20. The polymer electrolyte fuel cell according to claim 17, wherein: the water-releasing layer has a corrugated structure.
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이 특허에 인용된 특허 (7)
Chow Clarence Y. (Vancouver CAX) Wozniczka Boguslav M. (Coquitlam CAX), Electrochemical fuel cell stack with humidification section located upstream from the electrochemically active section.
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