CA2535005A1 - Solid oxide fuel cells with novel internal geometry - Google Patents

Solid oxide fuel cells with novel internal geometry Download PDF

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Publication number
CA2535005A1
CA2535005A1 CA002535005A CA2535005A CA2535005A1 CA 2535005 A1 CA2535005 A1 CA 2535005A1 CA 002535005 A CA002535005 A CA 002535005A CA 2535005 A CA2535005 A CA 2535005A CA 2535005 A1 CA2535005 A1 CA 2535005A1
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CA
Canada
Prior art keywords
solid oxide
fuel cell
oxide fuel
cell according
central bore
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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CA002535005A
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French (fr)
Other versions
CA2535005C (en
Inventor
Caine Finnerty
David Coimbra
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Nano CP LLC
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Individual
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8605—Porous electrodes
    • H01M4/8626—Porous electrodes characterised by the form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8605—Porous electrodes
    • H01M4/8621—Porous electrodes containing only metallic or ceramic material, e.g. made by sintering or sputtering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8875—Methods for shaping the electrode into free-standing bodies, like sheets, films or grids, e.g. moulding, hot-pressing, casting without support, extrusion without support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8882—Heat treatment, e.g. drying, baking
    • H01M4/8885—Sintering or firing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
    • H01M8/1226—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material characterised by the supporting layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fuel Cell (AREA)
  • Inert Electrodes (AREA)

Abstract

Fuel electrode-anode supported type solid oxide fuel cells (SOFC) comprise novel fuel electrode design with improved mechanical and electrochemical properties. The novel supporting anodes comprise a plurality of internal longitudinal elevations or bosses projecting inwardly into the central bore of the tubular body for structural reinforcement of the entire cell, increasing electrode surface area, optimizing the anode electronic conductivity, and facilitating the mounting of the cell into a SOFC assembly system (e.g., cell stack). The SOFCs of the invention contemplate a range of tubular configurations, including cylindrical and polygonal shapes having at least three surfaces. Low-cost manufacturing routes are also disclosed, whereby the protruding bosses in the anode support do not require additional processing steps compared to conventional forming techniques.

Claims (36)

1. A solid oxide fuel cell, characterized by comprising a tubular body having an interior wall as a supporting anode, said supporting anode defining a central bore of said fuel cell, and comprises at least one supporting means protruding into said central bore of said tubular body from said interior wall for structurally reinforcing said fuel cell.
2. The solid oxide fuel cell according to Claim 1, characterized wherein said supporting means are integral with said anode and comprise a plurality of elevations or bosses.
3. The solid oxide fuel cell according to Claim 1, characterized wherein said tubular body further comprises an electrolyte layer and a cathode layer in combination with said supporting anode.
4. The solid oxide fuel cell according to Claim 3, characterized wherein said tubular body is cylindrical or polygonal.
5. The solid oxide fuel cell according to Claim 4, characterized wherein said tubular body is polygonal and comprises at least three sides.
6. The solid oxide fuel cell according to Claim 5, characterized wherein said tubular body is hexagonal.
7. The solid oxide fuel cell according to Claim 5, characterized wherein said tubular body comprises three sides joined at vertices which are rounded.
8. The solid oxide fuel cell according to Claim 2, characterized wherein said elevations or bosses run substantially the entire length of said central bore of said tubular body.
9. The solid oxide fuel cell according to Claim 2, characterized wherein said elevations or bosses are shorter in length than said central bore of said tubular body.
10. The solid oxide fuel cell according to Claim 2, characterized wherein said elevations or bosses comprise a generally helical pattern along the length of said central bore.
11. The solid oxide fuel cell according to Claim 2, characterized wherein the protruding elevations or bosses are positioned symmetrically relative to one another within said central bore.
12. The solid oxide fuel cell according to Claim 2, characterized wherein said elevations or bosses are generally conically shaped.
13. The solid oxide fuel cell according to Claim 2, characterized wherein said elevations or bosses are generally square or rectangular shape.
14. The solid oxide fuel cell according to Claim 2, characterized wherein said elevations or bosses have a generally rounded shape.
15. The solid oxide fuel cell according to Claim 1, characterized wherein said tubular body is open both ends or closed at one end.
16. The solid oxide fuel cell according to Claim 1, characterized wherein said supporting means protruding into said central bore of said tubular body comprises the same material of construction as that of the interior wall.
17. The solid oxide fuel cell according to Claim 16, characterized wherein said material of construction of said anode and said supporting means comprises a cermet.
18. The solid oxide fuel cell according to Claim 17, characterized wherein said cermet comprises a stabilized-zirconia or a doped ceria.
19. The solid oxide fuel cell according to Claim 18, characterized wherein the stabilized zirconia is a material comprising (ZrO2)0.92(Y2O3)0.08.
20. The solid oxide fuel cell according to Claim 18, characterized wherein the doped ceria is a material comprising (Ce0.90Gd0.10)O1.95.
21. The solid oxide fuel cell according to Claim 17, characterized wherein the metal phase of the cermet is from the transition metals group of the Periodic Table of elements in a state selected from the group consisting of elemental metals, alloys and mixtures thereof.
22. The solid oxide fuel cell according to Claim 21, characterized wherein said transition metal is nickel.
23. The solid oxide fuel cell according to Claim 21, characterized wherein the content of the metal phase of the cermet ranges from about 30 vol % to about 80 vol %.
24. The solid oxide fuel cell according to Claim 3, characterized wherein the thickness of the cathode in the sintered state ranges from about 0.2 mm to about 2.0 mm.
25. The solid oxide fuel cell according to Claim 1, characterized wherein the thickness of the supporting means protruding into said central bore in a sintered state ranges from about 0.1 mm to about 2.0 mm.
26. A method for manufacturing a solid oxide fuel cell comprising at least a supporting anode characterized by the steps which comprise:
(i) blending a ceramic electrolyte material with an electrochemically active transition metal or transition metal oxide to form a fuel electrode mixture;
(ii) molding said fuel electrode mixture into a tubular fuel electrode having a central bore with at least one longitudinal elevation or boss protruding inwardly into said central bore, and (iii) drying said tubular fuel electrode.
27. The method according to Claim 26, characterized wherein the ceramic electrolyte material is a ceramic powder selected from the group consisting of stabilized-zirconia and doped-ceria.
28. The method according to Claim 26, characterized wherein the electrochemically active transition metal incorporated in said fuel electrode mixture is a metal oxide powder.
29. The method according to Claim 26, characterized wherein said transition metal is at least partially incorporated in said fuel electrode mixture by employing metal compounds pre-dissolved in aqueous or non-aqueous solvents.
30. The method according to Claim 26, including the step characterized by introducing a pore former into said fuel electrode mixture.
31. The method according to Claim 26, characterized wherein said fuel electrode mixture is a plastic mass suitable for extrusion molding.
32. The method according to Claim 26, characterized wherein said fuel electrode mixture is an aqueous or non-aqueous slurry suitable for molding by casting.
33. The method according to Claim 26, characterized wherein said fuel electrode mixture is a dry blend molded by a pressing method.
34. The method according to Claim 26, comprising the further steps characterized by:
(iv) applying an electrolyte layer to said dried tubular fuel electrode;
(v) sintering the fuel electrode-electrolyte structure of step (iv);
(vi) applying at least one cathode layer to the sintered fuel electrode-electrolyte structure of step (v), and (vii) sintering the fuel electrode-electrolyte-cathode structure to form tubular solid oxide fuel cell.
35. A solid oxide fuel cell supporting anode characterized by comprising a tubular body having an interior wall defining a central bore, said wall comprising at least one supporting means protruding into said central bore for structurally reinforcing said anode.
36. The solid oxide fuel cell supporting anode according to Claim 35, characterized wherein said supporting means are integral with said anode and comprises a plurality of elevations or bosses.
CA2535005A 2003-08-07 2004-08-05 Solid oxide fuel cells with novel internal geometry Expired - Lifetime CA2535005C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US49340903P 2003-08-07 2003-08-07
US60/493,409 2003-08-07
US10/910,026 2004-08-03
US10/910,026 US6998187B2 (en) 2003-08-07 2004-08-03 Solid oxide fuel cells with novel internal geometry
PCT/US2004/025233 WO2005018018A2 (en) 2003-08-07 2004-08-05 Solid oxide fuel cells with novel internal geometry

Publications (2)

Publication Number Publication Date
CA2535005A1 true CA2535005A1 (en) 2005-02-24
CA2535005C CA2535005C (en) 2011-02-08

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CA2535005A Expired - Lifetime CA2535005C (en) 2003-08-07 2004-08-05 Solid oxide fuel cells with novel internal geometry

Country Status (8)

Country Link
US (1) US6998187B2 (en)
EP (1) EP1665424B1 (en)
JP (1) JP2007501999A (en)
KR (1) KR20060054432A (en)
AU (1) AU2004300945B2 (en)
CA (1) CA2535005C (en)
TW (1) TW200531336A (en)
WO (1) WO2005018018A2 (en)

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Also Published As

Publication number Publication date
AU2004300945A1 (en) 2005-02-24
KR20060054432A (en) 2006-05-22
US20050042490A1 (en) 2005-02-24
WO2005018018A2 (en) 2005-02-24
WO2005018018A3 (en) 2005-06-23
JP2007501999A (en) 2007-02-01
EP1665424A4 (en) 2008-03-12
AU2004300945B2 (en) 2010-06-17
US6998187B2 (en) 2006-02-14
HK1097110A1 (en) 2007-06-15
EP1665424A2 (en) 2006-06-07
CA2535005C (en) 2011-02-08
TW200531336A (en) 2005-09-16
EP1665424B1 (en) 2012-12-12

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