Protective interlayer for high temperature solid electrolyte electrochemical cells

Patent · Mon Jan 01 00:00:00 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., Pittsburgh, PA (United States)
• 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

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