Clad copper wire having environmentally isolating alloy
View Patent ↗A current collector for a fuel cell that includes at least one wire having an inner core of high conductivity metal and an outer cladding of an environmentally isolating material. The current collector may be utilized in both an oxidizing and reducing environment.
1. A solid oxide fuel cell comprising:
a plurality of solid oxide fuel cell tubes providing exhaust fluid to an exhaust zone and a current collector,
the current collector electrically connecting the inner electrode of a first solid oxide fuel cell tube to an outer electrode of a second solid oxide fuel cell tube,
wherein the current collector comprises an inner core of high conductivity metal and an outer cladding of an environmentally isolating alloy,
wherein an anode portion of the current collector contacts an anode of a first solid oxide fuel cell tube of the plurality such that the electrons are conducted from the anode, through the environmentally isolating alloy to the conductive core of the current collector,
wherein a cathode portion of the current contacts a cathode portion of the solid oxide fuel cell tube to transfer electrons from the current collector to the cathode portion of the fuel cell tube, and
wherein an interconnect portion of the current collector comprises both the inner core of high conductivity metal and the outer cladding of the environmentally isolating alloy and is located between the anode portion and the cathode portion, and is positioned in a hot exhaust zone of the fuel cell tubes.
2. The solid oxide fuel cell of claim 1 , wherein the outer cladding of environmentally isolating material forms an electrically conductive oxide layer.
3. The solid oxide fuel cell of claim 1 , wherein the outer cladding is selected from the group consisting of: nickel alloys, cobalt alloys, and precious metals.
4. The solid oxide fuel cell of claim 1 wherein the inner core is selected from the group consisting of: copper, copper containing alloys, gold, silver, platinum, nickel and metals having a high conductivity.
5. The solid oxide fuel cell of claim 1 further including an intermediate layer surrounding the inner core, the intermediate layer surrounded by an outer layer.
6. The solid oxide fuel cell of claim 5 wherein the intermediate layer is formed of an environmentally isolating material and the outer layer is formed of an oxidation resistant material.
7. The solid oxide fuel cell of claim 5 , comprising a wire having a non-circular cross section.
8. The solid oxide fuel cell of claim 5 including at least one additional layer selected from the group consisting of: a bonding layer, a catalyst layer, a protective layer, a catalyst support layer, a layer that inhibits carbon deposition and formation in environments containing carbon containing species, a sinter bonding layer, a barrier layer to chromium vaporization, a getter layer, a layer containing a braze material, and a layer providing creep tolerance at elevated temperatures.
9. The solid oxide fuel cell of claim 8 wherein one or more of the inner core, intermediate layer, outer layer and additional layer is configured in a two dimensional pattern.
10. The solid oxide fuel cell of claim 8 wherein one or more of the inner core, intermediate layer, outer layer and additional layer is configured in a non-concentric ring geometry.
11. The solid oxide fuel cell of claim 1 , wherein the outer cladding comprises an alloy comprising 20%-26% chromium.
12. The solid oxide fuel cell of claim 11 , wherein the alloy of the outer cladding further comprises at least one of nickel and iron.