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A Very Nice Graphic on Thermochemical Hydrogen Production.
This is it:
The caption:
Fig. 1. Potential of nuclear reactor technologies for integration with hydrogen production technologies based on ranges of operating temperature.
It's from this publication: Rami S. El-Emam, Hasan Ozcan, Calin Zamfirescu, Updates on promising thermochemical cycles for clean hydrogen production using nuclear energy, Journal of Cleaner Production, Volume 262, 2020, 121424,
I found it as a reference in this publication while catching up on my reading: Hydrogen Production Technologies: From Fossil Fuels toward Renewable Sources. A Mini Review Pedro J. Megía, Arturo J. Vizcaíno, José A. Calles, and Alicia Carrero Energy & Fuels 2021 35 (20), 16403-16415
Hydrogen from so called "renewable energy" - about which much has been written for no result - is, like so called "renewable energy" itself, a nonstarter.
Nevertheless as my son starts his Ph.D research this summer in nuclear engineering, particularly as his BS and MS are in materials science, I am encouraging him, for thermodynamic reasons - high efficiency - to think in terms of very high temperature nuclear reactors.
Hydrogen in and of itself is not a safe consumer fuel, but as a captive intermediate it can do a great deal.