JPH06310155A - Manufacture of electrolytic cell for solid electrolytic fuel cell - Google Patents

Abstract

PURPOSE:To increase the conductibility and to improve the power generating capacity by sintering an interconnector material in a high temperature reducing atmosphere, and forming a fuel electrode, a solid electrolyte, and an air electrode in that order. CONSTITUTION:To an alumina pipe 1 to be a porous holder, nickel-aluminum alloys 2a and 2b to be an interconnector and a current lead are formed. They are sintered in a reducing atmosphere in which hydrogen is added at a high temperature, so as to sinter the inter-connector 2a and the current lead 2b which consist of a nickel-aluminum alloy. After that, membranes are form in the order a nickel 3 to be a fuel electrode, a yttria stabilized zirconia 4 to be a solid electrolyte, and a lanthanum-cobolt complex oxide 5 to be an air electrode. As a result, the conductibility and the density are improved, and the product is made difficult to be oxidized easily. Consequently, the conductibility of the connector 2a, or the connector 2a and the lead 2b, is increased, and the power generating capacity of the cell can be improved largely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrolytic cell of a solid oxide fuel cell.

[0002]

2. Description of the Related Art The structure of an electrolytic cell of a conventional solid oxide fuel cell will be described with reference to FIG. FIG. 2 is a sectional view of the electrolytic cell, 6 is a porous support, 7 is an interconnector,
8 is a current lead, 9 is a fuel electrode, 10 is a solid electrolyte, 1
1 is an air electrode. In the conventional structure, as shown in FIG. 2, the interconnector 7 is formed in a relatively upper layer near the air electrode 11.

[0003]

In the structure of the conventional electrolytic cell described above, the interconnector is formed in a relatively upper layer portion in the vicinity of the air electrode, so that it is easily oxidized during power generation. Further, since the interconnector membrane is less dense than the solid electrolyte, there is a gas leak in the interconnector portion, which greatly affects the performance deterioration.

In view of the above-mentioned state of the art, the present invention is to provide a method for producing the same electrolytic cell as the conventional electrolytic cell of a solid oxide fuel cell, which does not have a problem.

[0005]

According to the present invention, (1) an interconnector material is applied to a necessary portion of a porous support, the interconnector material is sintered in a high temperature reducing atmosphere, and then a fuel electrode, A method for producing a solid oxide fuel cell electrolysis cell, which comprises sequentially forming a solid electrolyte and an air electrode. (2) After applying the interconnector material and the current lead material to necessary portions on the porous support and sintering the interconnector material and the current lead material in a high temperature reducing atmosphere,
A method for producing a solid oxide fuel cell electrolysis cell, which comprises sequentially forming a fuel electrode, a solid electrolyte and an air electrode. Is.

[0006]

[Function] Since the interconnector material or the interconnector material and the current lead material are formed on the porous support before forming the electrode material and the solid electrolyte material, they are sintered in a high temperature reducing atmosphere to have high conductivity. Even if the denseness is improved, it has no effect on the electrode material and the solid electrolyte material. Therefore, the denseness of the interconnector and the electrode lead is improved, and the leakage of gas from this portion is prevented.

Further, since the fuel electrode, the solid electrolyte and the air electrode are sequentially formed after forming the interconnector or the current lead with the interconnector, the interconnector and the current lead are positioned on the fuel electrode side (reducing source gas side). As a result, the conductivity does not decrease due to oxidation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIG. FIG. 1 is a sectional view showing the structure of an electrolytic cell of a solid oxide fuel cell according to an embodiment of the present invention. In FIG. 1, 1 is an alumina tube of a porous support, 2a is a nickel aluminum alloy forming an interconnector, 2
b is a nickel aluminum alloy forming a current lead,
3 is nickel for a fuel electrode, 4 is yttria-stabilized zirconia for a solid electrolyte, and 5 is a lanthanum-cobalt composite oxide for an air electrode.

In the present invention, 1000 to 13 are formed after forming the nickel aluminum alloys 2a and 2b to be interconnectors and current leads on the alumina tube 1 which is a porous support.
It is fired in a reducing atmosphere containing hydrogen at a high temperature of 00 ° C. to sinter the interconnector 2a and the current lead 2b made of a nickel aluminum alloy. After that, a film is formed in the order of nickel 3 as a fuel electrode, yttria-stabilized zirconia 4 as a solid electrolyte, and lanthanum cobalt composite oxide 5 as an air electrode.

[0010]

As described above, according to the present invention, by first forming the interconnector or the interconnector and the current lead on the porous support, the film can be pre-sintered in a high temperature reducing atmosphere, The conductivity and the denseness can be improved. Further, since the interconnector or the interconnector and the current lead are formed on the fuel supply side, they are not easily oxidized during power generation. Therefore, the conductivity of the interconnector or the interconnector and the current lead is increased, which greatly contributes to the improvement of the power generation performance of the battery.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electrolysis cell of a solid oxide fuel cell manufactured according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of one aspect of an electrolytic cell of a conventional solid oxide fuel cell.

Claims (2)

[Claims] 1. A method for applying an interconnector material to a required portion of a porous support, sintering the interconnector material in a high-temperature reducing atmosphere, and then forming a fuel electrode, a solid electrolyte, and an air electrode sequentially. A method for producing a solid oxide fuel cell electrolysis cell, comprising: 2. An interconnector material and a current lead material are applied to necessary portions on a porous support, and the interconnector material and the current lead material are sintered in a high temperature reducing atmosphere, and then a fuel electrode and a solid electrolyte. And a method for manufacturing a solid oxide fuel cell electrolysis cell, which comprises sequentially forming an air electrode.