Hydrogen production via electrolysis isn’t over 90% in real systems. It’s more on the order of 70% for real world systems. Some small scale research systems can

Hydrogen production via electrolysis isn’t over 90% in real systems. It’s more on the order of 70% for real world systems. Some small scale research systems can hit 90% or more for various solid oxide electrodes, but they’re fragile and generally not commercially available yet. See https://www.sciencedirect.com/science/article/pii/S2589299119300035 https://www.sciencedirect.com/science/article/pii/S258929911... as an example overview.