Key features of SOFCs:

High efficiency (up to 60% electrical; >80% in combined heat and power systems)
Fuel flexibility (can use hydrogen, natural gas, biogas, etc.)
Solid-state components (no moving parts, enhancing durability)
Environmentally friendly (low NOₓ, SOₓ, and CO₂ emissions when used with clean fuels)

How it works:

Oxygen from air is reduced at the cathode to form oxygen ions.
These ions migrate through the solid electrolyte to the anode.
At the anode, the ions react with the fuel to generate electricity, heat, and byproducts (like water or CO₂).

Common applications:

SOFCs are particularly suited for long-duration, high-efficiency energy systems and are under active development for broader commercial deployment.