Controlled hydrogen feed and current heating warm a fuel cell stack below 0°C without external heaters, limiting freezing damage and aging.
Varying pore density in the separator evens air flow near the manifold, reducing local degradation and sustaining fuel cell performance.
Output voltage is checked only when pressure, flow, temperature, impedance, and current are in range for more reliable fuel cell stack degradation assessment.
A graded CeO2-based intermediate layer thickens at the cell edge to improve bonding while lowering resistance in the active region.
Hollow fasteners route gas through a frameless SOFC stack, cutting weight and thickness while avoiding adhesive sealing issues.
A copper-oxide interconnect coating sinters to the oxygen electrode, limiting chromium poisoning and thermal stress gaps in SOC stacks.
A tensioned skirt maintains solid oxide fuel cell stack compression through thermal cycling, preserving gas seals and lowering short-circuit risk.