Gas diffusion electrodes and process for production thereof
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C25B-001/46
C25B-011/03
C25B-011/04
H01M-004/86
H01M-004/88
H01M-004/90
H01M-012/04
H01M-012/08
H01M-008/1018
출원번호
US-0616266
(2012-09-14)
등록번호
US-9714472
(2017-07-25)
우선권정보
DE-10 2011 083 314 (2011-09-23)
발명자
/ 주소
Bulan, Andreas
Kintrup, Jürgen
Schmitz, Norbert
Karpenko, Alexander
Aβmann, Jens
출원인 / 주소
COVESTRO DEUTSCHLAND AG
대리인 / 주소
Drinker Biddle & Reath LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록
A gas diffusion electrode is described, especially for use in chloralkali electrolysis, said gas diffusion electrode having finely divided components on the liquid side. The electrode is notable for a low perviosity to gases and a lower operating voltage.
대표청구항▼
1. An oxygen-consuming electrode comprising (1) at least one carrier in the form of a flat structure, (2) a coating with a gas diffusion layer, and (3) a catalytically active component comprising silver, silver(I) oxide, silver(II) oxide, or mixtures thereof, wherein the oxygen-consuming electrode f
1. An oxygen-consuming electrode comprising (1) at least one carrier in the form of a flat structure, (2) a coating with a gas diffusion layer, and (3) a catalytically active component comprising silver, silver(I) oxide, silver(II) oxide, or mixtures thereof, wherein the oxygen-consuming electrode further comprises hydrophilic pores with an entry, and a finely divided hydrophilic component having a specific surface area in the range of from 8 to 12 m2/g, having a mean particle diameter in the range from 20 to 100 nm and in an amount of from 100 mg to 10 g/m2 of electrode area, on a side which faces towards liquid or an ion exchanger membrane when in operation. 2. The oxygen-consuming electrode of claim 1, wherein the finely divided hydrophilic component catalyses the reduction of oxygen. 3. The oxygen-consuming electrode of claim 1, wherein the finely divided hydrophilic component is silver. 4. The oxygen-consuming electrode of claim 1, wherein the finely divided hydrophilic component covers from 5 to 80% of the entry area of the hydrophilic pores in the oxygen-consuming electrode. 5. The oxygen-consuming electrode of claim 1, wherein the oxygen-consuming electrode, apart from the finely divided hydrophilic component, comprises mixtures which contain, as a catalytically active component, from 70 to 95% by weight of silver oxide, from 0 to 15% by weight of silver metal, and from 3 to 15% by weight of an insoluble fluorinated polymer. 6. The oxygen-consuming electrode of claim 5, wherein the silver oxide is silver(I) oxide and the insoluble fluorinated polymer is PTFE. 7. The oxygen-consuming electrode of claim 1, wherein the oxygen-consuming electrode has, as a carrier element, an electrically conductive flat structure. 8. The oxygen-consuming electrode of claim 7, wherein the electrically conductive flat structure is based on nickel or silver-coated nickel. 9. A fuel cell or a metal/air battery comprising the oxygen-consuming electrode of claim 1. 10. The oxygen-consuming electrode of claim 1, wherein the finely divided hydrophilic component having a mean particle diameter in the range from 40 to 80 nm. 11. The oxygen-consuming electrode of claim 1, wherein the finely divided hydrophilic component having a mean particle diameter in the range from 50 to 70 nm. 12. The oxygen-consuming electrode of claim 1, comprising the finely divided hydrophilic component in an amount of from 1 g to 5 g/m2 of electrode area. 13. A process for producing the oxygen-consuming electrode of claim 1, comprising (1) applying or spraying a finely divided, hydrophilic component in a suspension with a concentration of from 0.1 to 50% by weight to a flat base electrode comprising at least one carrier in the form of a flat structure, a coating with a gas diffusion layer, and a catalytically active component, and (2) subsequently removing the suspension medium by evaporation. 14. The process of claim 13, wherein the suspension medium has a boiling point of from 50 to 150° C. 15. The process of claim 13, wherein the suspension medium is an alcohol. 16. The process of claim 13, wherein the amount of the finely divided component applied is 100 mg to 10 g per square meter of electrode area. 17. The process of claim 13, wherein the base electrode used is a spent or leaky oxygen-consuming electrode. 18. The process of claim 13, wherein the finely divided, hydrophilic component is in a suspension with a concentration of from 1 to 20% by weight. 19. The process of claim 13, wherein the suspension medium has a boiling point of from 60 to 100° C. 20. The process of claim 13, wherein the suspension medium is i-propanol. 21. The process of claim 13, wherein the amount of the finely divided component applied is 1 to 5 g per square meter of electrode area.
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이 특허에 인용된 특허 (4)
Plowman Keith R. (Baton Rouge LA) Goldsmith Charles E. (Baton Rouge LA), Gas diffusion composite electrode having novel hydrophilic layer.
Kijlstra, Johan; Weuta, Peter H.; Storch, Dirk; Duff, Daniel; Hoheisel, Werner, Method for producing metal particles, metal particles produced thereby, and the use thereof.
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