Kas Hemmes TU Delft Hydrogen and Fuel Cells; Hype or Hope? Hydrogen is in the news. Often in the same sentence fuel cells are mentioned as well. What's going on. Is it new? What are the benefits? What are the counterarguments? Are there any showstoppers? Are we going to use 100% Hydrogen (in two meanings)? Do we better start with mixing hydrogen into the natural gas network? These and other questions will -if not answered - at least be discussed.