Electrochemical cell stack
An electrochemical cell stack according to a first aspect of the present invention includes an electrochemical cell and a manifold supporting a base end of the electrochemical cell. The electrochemical cell includes an electric insulative support substrate and a plurality of power generation units disposed on the support substrate. Additionally, a gas flow path is provided in the support substrate. Each of the plurality of power generation units includes an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. Additionally, the solid electrolyte layer contains a zirconia-based material as a main component thereof. In a distal end side power generation unit, which is farthest from the manifold among the plurality of power generation units, the solid electrolyte layer includes a first area covering within 3 μm from an anode side surface, and a second area provided on the first area. An intensity ratio of tetragonal zirconia to cubic zirconia in a Raman spectrum in the first area is greater than an intensity ratio of tetragonal zirconia to cubic zirconia in the Raman spectrum in the second area.
1. An electrochemical cell stack, comprising:
an electrochemical cell; and
a manifold supporting a base end of the electrochemical cell;
the electrochemical cell including an electric insulative support substrate and a plurality of power generation units disposed on the support substrate, a gas flow path being provided in the support substrate;
each of the plurality of power generation units including an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode, the solid electrolyte layer containing a zirconia-based material as a main component thereof;
in a distal end side power generation unit, which is farthest from the manifold among the plurality of power generation units, the solid electrolyte layer including a first area covering within 3 μm from an anode side surface, and a second area provided on the first area; and
an intensity ratio of tetragonal zirconia to cubic zirconia in a Raman spectrum in the first area being greater than an intensity ratio of tetragonal zirconia to cubic zirconia in the Raman spectrum in the second area.
2. The electrochemical cell stack according to claim 1 , wherein
the intensity ratio of the tetragonal zirconia to the cubic zirconia in the Raman spectrum in the first area is 1% or greater.
3. The electrochemical cell stack according to claim 1 , wherein
the intensity ratio of the tetragonal zirconia to the cubic zirconia in the Raman spectrum in the second area is 0.1% or less.
4. An electrochemical cell stack, comprising:
an electrochemical cell; and
a manifold supporting a base end of the electrochemical cell;
the electrochemical cell including an electric conductive support substrate and a power generation unit disposed on the support substrate, a gas flow path being provided in the support substrate;
the power generation unit including an anode disposed on a first main surface of the support substrate, a cathode, and a solid electrolyte layer disposed between the anode and the cathode, the solid electrolyte layer containing a zirconia-based material as a main component thereof;
the solid electrolyte layer including a distal end portion positioned on a side of the distal end of the electrochemical cell and a separated portion positioned separated from the distal end;
the distal end portion including a first area covering within 3 μm from an anode side surface, and a second area provided on the first area; and
an intensity ratio of tetragonal zirconia to cubic zirconia in a Raman spectrum in the first area being greater than an intensity ratio of tetragonal zirconia to cubic zirconia in the Raman spectrum in the second area.
5. The electrochemical cell stack according to claim 4 , wherein
the distal end portion is an area covering ¼ a total length of the solid electrolyte layer in a direction in which the gas flow path extends.
6. The electrochemical cell stack according to claim 4 , wherein
the intensity ratio of the tetragonal zirconia to the cubic zirconia in the Raman spectrum in the first area is 1% or greater.
7. The electrochemical cell stack according to claim 4 , wherein
the intensity ratio of the tetragonal zirconia to the cubic zirconia in the Raman spectrum in the second area is 0.1% or less.