This specific configuration is a high-performance Electrolyte-Supported Cell (ESC), likely utilizing a Scandia-Stabilized Zirconia (SSZ) membrane. By layering Ni-GDC and Ni-YSZ on the anode side, you are creating a functionally graded electrode designed to maximize triple-phase boundaries (TPB) while maintaining mechanical adhesion to the SSZ support.

SSZ Electrolyte Support (~150–200 um): The active material is Sc0.1Zr0.9O{2-x} (10ScSZ) or similar. Scandia-stabilized zirconia offers the highest ionic conductivity of all zirconia-based electrolytes. It allows for a thicker, more robust support than YSZ while maintaining lower ohmic resistance at 700°C–800°C.

Ni-YSZ Intermediate Anode Layer: Since YSZ and SSZ have very similar thermal expansion coefficients (TEC), this layer acts as a mechanical bridge. It provides a stable framework for the nickel catalyst and ensures the anode doesn't delaminate from the SSZ support during thermal cycling.

Ni-GDC Active Anode Layer: GDC (Gadolinium-doped Ceria) is a mixed ionic-electronic conductor (MIEC) in reducing atmospheres. By placing Ni-GDC at the "active" interface (closest to the fuel or as the outermost layer), you extend the triple-phase boundary beyond just the physical contact points of Ni and Electrolyte, significantly reducing activation polarization.

Part Number	CSOFECESANNS (C-SOFEC-ESA-NNS)
Cell Composition	Anode with Bilayers: NiO-GDC/NiO-YSZ (D-12.5 mm, T=~50 um) Electrolyte: SSZ (D=20 mm, T=~130-170 um)
Button Cell Size	(1) D=20 mm (2) D=25 mm
Package Grade	1 pcs/pack (bulk quantity can be supplied upon request and certain discount will be applied)

References:

1. Z. Drach, et al., Impedance spectroscopy analysis inspired by evolutionary programming as a diagnostic tool for SOEC and SOFC, Solid State Ionics, 2016, 288, 307-310.
2. N. Q. Minh, et al., Sputtered Thin-Film Solid Oxide Fuel Cells, ECS Trans., 2021, 103 67.