In both Solid Oxide Fuel Cells (SOFC) and Solid Oxide Electrolysis Cells (SOEC), SSZ (Scandia-Stabilized Zirconia), also known as ScSZ, is the high-performance alternative to YSZ.It is widely considered the "gold standard" for Intermediate Temperature (IT) operation (600-800 °C) due to its significantly higher ionic conductivity.

The primary reason to use SSZ is that it offers 3 to 4 times the oxygen ion conductivity of 8YSZ at the same temperature. (1) Radius Advantage: The Sc^{3+} ion (0.87 Å) has an ionic radius much closer to the Zr^{4+} ion (0.84 Å) than Y^{3+} does. This creates a more "open" and less strained crystal lattice, allowing oxygen vacancies to move with much lower resistance. (2) Intermediate Temperature Efficiency: At 650 °C, the conductivity of SSZ is roughly equivalent to that of YSZ at 800 °C. This allows for high power densities in SOFCs and efficient hydrogen production in SOECs without the extreme heat that accelerates material degradation.

Part Number	CITSOFECOCESSZ (C-ITSOFEC-OCE-SSZ)
Purity	≥99.9%
Chemical Formula	(Sc2O3)0.1(CeO2)0.01(ZrO2)0.89 Other chemical formula with various customized ratios can be supplied upon request
PSD (D50)	0.5-3.0 um
Surface Area	4-8 m2/g
XRD
Ion Conductivity
Package Grade	100 or 500 g/bottle (other grades, such as 1000 g or larger can be supplied upon request)

References:

1. A. Mahmood, et al., High-performance solid oxide electrolysis cell based on ScSZ/GDC (scandia-stabilized zirconia/gadolinium-doped ceria) bi-layered electrolyte and LSCF (lanthanum strontium cobalt ferrite) oxygen electrode, Energy, 2015, 90, 344-350.
2. M. Liu, et al., Investigation of (CeO2)x(Sc2O3)(0.11−x)(ZrO2)0.89 (x = 0.01–0.10) electrolyte materials for intermediate-temperature solid oxide fuel cell, J. Alloys Compounds, 2010, 502, 319-323.