Protective interlayer for high temperature solid electrolyte electrochemical cells

Patent · Mon Jan 01 04:00:00 EST 1996

OSTI ID:870413

Singh, Prabhakar ^[1]; Vasilow, Theodore R ^[2]; Richards, Von L ^[3]

---

1. Export, PA
2. Manor, PA
3. Angola, IN

The invention comprises of an electrically conducting doped or admixed cerium oxide composition with niobium oxide and/or tantalum oxide for electrochemical devices, characterized by the general formula: Nb.sub.x Ta.sub.y Ce.sub.1-x-y O.sub.2 where x is about 0.0 to 0.05, y is about 0.0 to 0.05, and x+y is about 0.02 to 0.05, and where x is preferably about 0.02 to 0.05 and y is 0, and a method of making the same. This novel composition is particularly applicable in forming a protective interlayer of a high temperature, solid electrolyte electrochemical cell (10), characterized by a first electrode (12); an electrically conductive interlayer (14) of niobium and/or tantalum doped cerium oxide deposited over at least a first portion (R) of the first electrode; an interconnect (16) deposited over the interlayer; a solid electrolyte (18) deposited over a second portion of the first electrode, the first portion being discontinuous from the second portion; and, a second electrode (20) deposited over the solid electrolyte. The interlayer (14) is characterized as being porous and selected from the group consisting of niobium doped cerium oxide, tantalum doped cerium oxide, and niobium and tantalum doped cerium oxide or admixtures of the same. The first electrode (12), an air electrode, is a porous layer of doped lanthanum manganite, the solid electrolyte layer (18) is a dense yttria stabilized zirconium oxide, the interconnect layer (16) is a dense, doped lanthanum chromite, and the second electrode (20), a fuel electrode, is a porous layer of nickel-zirconium oxide cermet. The electrochemical cell (10) can take on a plurality of shapes such as annular, planar, etc. and can be connected to a plurality of electrochemical cells in series and/or in parallel to generate electrical energy.

• Research Organization: WESTINGHOUSE ELECTRIC CORP
• DOE Contract Number: AC21-80ET17089
• Assignee: Westinghouse Electric Corporation (Pittsburgh, PA)
• Patent Number(s): US 5516597
• OSTI ID: 870413
• Country of Publication: United States
• Language: English

Related Subjects

/429/
02
05
1-x-y
10
12
14
16
18
20
admixed
admixtures
air
air electrode
annular
applicable
cell
cells
cerium
cerium oxide
cermet
characterized
chromite
composition
comprises
conducting
conductive
connected
consisting
dense
deposited
devices
discontinuous
doped
doped cerium
doped lanthanum
electrical
electrical energy
electrically
electrically conducting
electrically conductive
electrochemical
electrochemical cell
electrochemical cells
electrochemical device
electrochemical devices
electrode
electrolyte
electrolyte electrochemical
electrolyte layer
energy
etc
forming
formula
fuel
fuel electrode
generate
generate electric
interconnect
interconnect layer
interlayer
lanthanum
lanthanum chromite
lanthanum manganite
layer
manganite
method
nb
nickel-zirconium
niobium
niobium oxide
novel
novel composition
oxide
oxide composition
oxide deposited
parallel
particularly
particularly applicable
planar
plurality
porous
porous layer
portion
preferably
protective
protective interlayer
selected
series
shapes
solid
solid electrolyte
stabilized
stabilized zirconium
tantalum
tantalum oxide
temperature
temperature solid
yttria
yttria stabilized
zirconium
zirconium oxide