Fuel cell element electrode including layers with varying hydrophobicity
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-027/407
H01M-008/08
H01M-004/04
H01M-004/86
H01M-004/90
H01M-004/92
H01M-008/02
출원번호
US-0190038
(2008-08-12)
등록번호
US-9077009
(2015-07-07)
발명자
/ 주소
Babes-Dornea, Elena
Grincourt, Yves
출원인 / 주소
General Electric Company
대리인 / 주소
Parks Wood LLC
인용정보
피인용 횟수 :
0인용 특허 :
11
초록▼
An electrode for a fuel cell element including a hydrophobic graphite support layer; a semi-hydrophobic electro-catalyst layer including an electro-catalytically active material in a carbon substrate and a polytretrofluorethylene (PTFE) content having a first concentration; and a hydrophilic electro
An electrode for a fuel cell element including a hydrophobic graphite support layer; a semi-hydrophobic electro-catalyst layer including an electro-catalytically active material in a carbon substrate and a polytretrofluorethylene (PTFE) content having a first concentration; and a hydrophilic electro-catalyst layer including an electro-catalytically active material in a carbon substrate and having a PTFE content having a second concentration that is less than the first concentration.
대표청구항▼
1. A gas sensor electrode for measuring gas content in gas streams, the electrode comprising: a hydrophobic graphite support layer coated in polytetrafluoroethylene (PTFE) having a water absorption capability of approximately 0%;a semi-hydrophobic electro-catalyst layer, which is less hydrophobic th
1. A gas sensor electrode for measuring gas content in gas streams, the electrode comprising: a hydrophobic graphite support layer coated in polytetrafluoroethylene (PTFE) having a water absorption capability of approximately 0%;a semi-hydrophobic electro-catalyst layer, which is less hydrophobic than the hydrophobic graphite support layer and having a water absorption capability of 10% to 50% by weight, including an electro-catalytically active material in a carbon substrate and a polytetrafluoroethylene (PTFE) content having a first concentration; anda hydrophilic electro-catalyst layer including an electro-catalytically active material in a carbon substrate and having a PTFE content having a second concentration that is less than the first concentration and having a water absorption capability of 60% to 100%. 2. The electrode of claim 1, wherein the semi-hydrophobic electro-catalyst layer is obtained by spraying a solution including the PTFE content onto the carbon substrate. 3. The electrode of claim 1, wherein the hydrophilic electro-catalyst layer is obtained by spreading a mixture including PTFE onto the carbon substrate. 4. The electrode of claim 1, wherein the hydrophobic graphite support layer includes a graphite paper. 5. The electrode of claim 1, wherein the hydrophobic graphite support layer faces a gas phase of the electrode, and the hydrophilic electro- catalyst layer faces a gel electrolyte of the electrode. 6. The electrode of claim 1, wherein the electro-catalytically active material for the semi-hydrophobic electro-catalyst layer and the hydrophilic electro-catalyst layer is selected from the group consisting of: platinum (Pt) and alloys thereof, ruthenium (Ru), palladium (Pd), iridium (Ir), gold (Au), vanadium (V), titanium (Ti), nickel (Ni), scandium (Sc) and rhodium (Rh). 7. A gas sensor for measuring gas content in gas streams comprising: a first electrode;a second electrode;a gel electrolyte positioned between the first and second electrode;at least one of the first and second electrodes including: a hydrophobic graphite support layer coated in polytetrafluoroethylene (PTFE) having a water absorption capability of approximately 0%;a semi-hydrophobic electro-catalyst layer, which is less hydrophobic than the hydrophobic graphite support layer and having a water absorption capability of 10% to 50% by weight, including an electro-catalytically active material in a carbon substrate and a polytetrafluoroethylene (PTFE) content having a first concentration; anda hydrophilic electro-catalyst layer including an electro-catalytically active material in a carbon substrate and having a PTFE content having a second concentration that is less than the first concentration and having a water absorption capability of 60% to 100%;an air side element supplying an oxygen containing gas to one of the electrodes;a gas side element supplying a gas mixture to the other of the electrodes;a wire contact coupled to each electrode; anda signal measuring means coupled to the wire contacts for determining a gas content of the gas mixture. 8. The sensor of claim 7, wherein the semi-hydrophobic electro-catalyst layer is obtained by spraying a solution including the PTFE content onto the carbon substrate. 9. The sensor of claim 7, wherein the hydrophilic electro-catalyst layer is obtained by spreading a mixture including PTFE onto the carbon substrate. 10. The sensor of claim 7, wherein the hydrophobic graphite support layer includes a graphite paper. 11. The sensor of claim 7, wherein the hydrophobic graphite support layer faces a gas phase of the sensor, and the hydrophilic electro-catalyst layer faces the gel electrolyte. 12. The sensor of claim 7, wherein both the first and second electrodes include: the hydrophobic graphite support layer;the semi-hydrophobic electro-catalyst layer; and the hydrophilic electro-catalyst layer. 13. The sensor of claim 12, wherein the sensor monitors hydrogen gas. 14. The sensor of claim 7, wherein one of the first and second electrodes includes the hydrophobic graphite support layer, the semi-hydrophobic electro-catalyst layer, and the hydrophilic electro-catalyst layer, and the other of the first and second electrodes includes a gold and perfluorosulfonic acid polymer gas permeable layer and a porous, gas permeable gold layer. 15. The sensor of claim 14, wherein the sensor monitors acetylene gas. 16. The sensor of claim 7, wherein the gel electrolyte includes sulfuric acid (H2SO4). 17. The sensor of claim 7, wherein the gel electrolyte is positioned within a polypropylene support. 18. The sensor of claim 7, wherein the electro-catalytically active material for the semi-hydrophobic electro-catalyst layer and the hydrophilic electro-catalyst layer is selected from the group consisting of: platinum (Pt) and alloys thereof, ruthenium (Ru), palladium (Pd), iridium (Ir), gold (Au), vanadium (V), titanium (Ti), nickel (Ni), scandium (Sc) and rhodium (Rh).
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