IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0797891
(2007-05-08)
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등록번호 |
US-8557453
(2013-10-15)
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우선권정보 |
KR-10-2006-0044128 (2006-05-17) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Bushnell, Esq., Robert E.
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인용정보 |
피인용 횟수 :
0 인용 특허 :
2 |
초록
▼
A fuel cell system having a water recovering and circulating structure, includes an electric generator provided with a membrane electrode assembly including an anode electrode into which a hydrogen containing fuel is introduced, a cathode electrode into which an oxidant is introduced, and an electro
A fuel cell system having a water recovering and circulating structure, includes an electric generator provided with a membrane electrode assembly including an anode electrode into which a hydrogen containing fuel is introduced, a cathode electrode into which an oxidant is introduced, and an electrolyte polymer membrane interposed between the anode and cathode electrodes. The cathode electrode includes: a first catalyst layer which is in contact with the electrolyte polymer membrane and in which a reduction reaction for the oxidant occurs; and a first gas diffusion layer to diffuse the oxidant on the first catalyst layer. At least a part of the first gas diffusion layer directly contacts the electrolyte polymer membrane. Thus, water produced by the chemical reaction in the cathode electrode is introduced into the anode electrode through the electrolyte polymer membrane, and water is effectively prevented from evaporating, thereby enhancing the water recovering efficiency and thus enhancing the power generation efficiency of the fuel cell system.
대표청구항
▼
1. A fuel cell system having a water recovering and circulating structure, the system comprising: an electric generator comprising: a membrane electrode assembly including an anode electrode into which a hydrogen containing fuel is introduced, a cathode electrode into which an oxidant is introduced,
1. A fuel cell system having a water recovering and circulating structure, the system comprising: an electric generator comprising: a membrane electrode assembly including an anode electrode into which a hydrogen containing fuel is introduced, a cathode electrode into which an oxidant is introduced, and an electrolyte polymer membrane interposed between the anode and cathode electrodes, the electrotype polymer membrane including a hydrogen ion exchange membrane; wherein the cathode electrode includes: a first catalyst layer arranged in contact with the electrolyte polymer membrane and adapted to effect a reduction reaction for the oxidant; anda first gas diffusion layer adapted to diffuse the oxidant on the first catalyst layer, at least a part of the first gas diffusion layer directly contacting the electrolyte polymer membrane; anda water-evaporation preventing member to prevent water evaporation, the first gas diffusion layer being disposed between the water-evaporation preventing member and the electrolyte polymer membrane, the water-evaporation preventing member directly contacting the first gas diffusion layer. 2. The fuel cell system according to claim 1, wherein the first gas diffusion layer has a larger area than the first catalyst layer. 3. The fuel cell system according to claim 2, wherein the anode electrode comprises a second catalyst layer arranged in contact with the electrolyte polymer membrane and adapted to effect an oxidation reaction for the hydrogen containing fuel, and a second gas diffusion layer adapted to diffuse the hydrogen containing fuel on the second catalyst layer. 4. The fuel cell system according to claim 3, wherein the second catalyst layer has the same area as the second gas diffusion layer. 5. The fuel cell system according to claim 3, wherein the first gas diffusion layer has a larger area than the second gas diffusion layer. 6. The fuel cell system according to claim 3, wherein the electric generator comprises gaskets respectively arranged with the anode and cathode electrodes. 7. The fuel cell system according to claim 6, wherein the gaskets are arranged with respective openings exposing surfaces of the first and second gas diffusion layers. 8. The fuel cell system according to claim 7, wherein the opening of a first gasket provided with the cathode electrode is larger than the opening of a second gasket provided with the anode electrode. 9. The fuel cell system according to claim 1, wherein the water-evaporation preventing member comprises a hydrophobic membrane. 10. The fuel cell system according to claim 9, wherein the hydrophobic membrane comprises a fluoric resin. 11. The fuel cell system according to claim 10, wherein the fluoric resin comprises at least one resin selected from among polytetrafluoro ethylene (PTFE), perfluorocarbon sulfonic acid, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), polytetrafluoroethylene-hexafluoropropylene copolymer (FEP), polychlorotrifluoroethylene (PCTFE), polyfluorovinyledene (PVDF), polyfluorovinyl (PVF), tetrafluoroethylene-ethylene copolymer (FTFE). 12. The fuel cell system according to claim 3, wherein the first gas diffusion layer of the cathode electrode is directly exposed to air. 13. The fuel cell system according to claim 12, further comprising a housing having an accommodating space adapted to accommodate the electric generator, the housing including a storage space adapted to store the hydrogen containing fuel to be supplied to the anode electrode, and a top plate having vents to directly expose the cathode electrode to air. 14. The fuel cell system according to claim 13, wherein the water-evaporation preventing member is arranged between the top plate of the housing and the first gas diffusion layer of the cathode electrode. 15. The fuel cell system according to claim 14, wherein the water-evaporation preventing member comprises a hydrophobic membrane. 16. The fuel cell system according to claim 15, wherein the hydrophobic membrane comprises a fluoric resin. 17. The fuel cell system according to claim 16, wherein the fluoric resin comprises at least one resin selected from among polytetrafluoro ethylene (PTFE), perfluorocarbon sulfonic acid, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), polytetrafluoroethylene-hexafluoropropylene copolymer (FEP), polychlorotrifluoroethylene (PCTFE), polyfluorovinyledene (PVDF), polyfluorovinyl (PVF), tetrafluoroethylene-ethylene copolymer (FTFE).
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