Seventy solid-oxide cells, tested as one stack, ran on steam for 25,000 hours. After conditioning, the voltage loss across 22,000 of those hours was 0.05 percent per 1,000 hours, or 0.65 millivolts per cell in that same span. The authors call the run the longest and least degraded full stack they know. It is one laboratory stack.
The experiment's clock shows 25,000 hours of steam on a stack built from 70 solid-oxide electrolysis cells. That duration is the paper's duration. Conditioning came first. Over the following 22,000 hours the voltage slipped by 0.05 percent for each block of 1,000 hours. The same slip equals 0.65 millivolts on every cell. Nothing in that sentence is a plant on a public grid.[1]
Current into the stack mixed alternating and direct forms, and the mix depended on frequency. In the authors' wording this is the longest full-stack run they know and the one with the lowest degradation. The hardware is a single stack in a laboratory. The paper does not present a measurement taken at a station that feeds a grid.[1]
Phys.org and Live Science added no second news account of this runtime in the feeds checked for the slot. The 25,000-hour steam run, the 0.05 percent loss and the 0.65 millivolt figure stay the paper's. They are not a price, a factory date or a claim that the same hardware is ready for a utility. Seventy solid-oxide cells ran as one stack on steam for 25,000 hours. After conditioning, voltage loss over 22,000 hours was 0.05 percent per 1,000 hours, equal to 0.65 millivolts per cell in that span. The authors present the run as the full-stack test they know with the least degradation, and the one that lasted longest. The hardware is one laboratory stack. It is not a reading from a plant on a grid. The current mixed alternating and direct forms, and the mix depended on frequency. The magnitude is hours and millivolts on one stack, not a cost and not a factory schedule.[1]
