NiO/8YSZ Composite Powder as Cermet Electrode for SOFC/SOEC, 100 g/bottle, CSOFECCENiO8YSZ
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In the architecture of Solid Oxide Fuel Cells (SOFC) and Electrolysis Cells (SOEC), NiO/8YSZ composite powder is the industry-standard material for the hydrogen electrode. By pre-mixing Nickel Oxide (NiO) with 8 mol% Yttria-Stabilized Zirconia (8YSZ), manufacturers create a cermet (ceramic-metal composite) that balances catalytic activity, ionic conductivity, and mechanical stability.
After the initial heating of the cell, a reduction step converts the NiO into metallic Nickel (Ni). The resulting composite serves three critical functions: (1) Nickel (Ni) Phase: Provides electronic conductivity and acts as the catalyst for hydrogen oxidation (H2 → 2H+ + 2e- in SOFC mode) or steam reduction (H2O + 2e- → H2 + O^(2-) in SOEC mode. (2) 8YSZ Phase: Provides a path for oxygen ions (O^{2-}) and creates a rigid ceramic backbone. This "skeleton" prevents the nickel particles from sintering (clumping) at high operating temperatures (700-900 °C). (3) Porosity: The reduction of NiO to Ni involves a volume shrinkage of ~40%, which naturally generates the interconnected pores necessary for gas transport.
| Part Number |
CSOFECCENiO8YSZ (C-SOEFC-CE-NiO8YSZ) |
| Chemical Formula |
(1) Formula 1 Initial: 60 wt% NiO +40 wt% (Y2O3)0.08(ZrO2)0.92 After Reduction: 44.3 vol% NiO + 55.7 vol% (Y2O3)0.08(ZrO2)0.92 (2) Formula 2 Initial: 66 wt% NiO +34 wt% (Y2O3)0.08(ZrO2)0.92 After Reduction: 50.7 vol% NiO + 49.3 vol% (Y2O3)0.08(ZrO2)0.92 |
| BET Surface Area |
1-4 m2/g for formula 1 4-8 m2/g for formula 2 |
| Package Grade |
100 g/bottle (other grades, such as 500 g, 1000 g, or higher can be supplied upon request) |
References:
- A. Hauch, et al., Ni/YSZ electrodes structures optimized for increased electrolysis performance and durability, Solid State Ionics, 2016, 293, 27-36.
- Hari Prasad Dasari, Electrochemical characterization of Ni–yttria stabilized zirconia electrode for hydrogen production in solid oxide electrolysis cells, J. Power Sources, 2013, 240, 721-728.