Making hydrogen today is a pretty dirty business. But that is changing as more companies seek ways to decarbonize the economy.
One increasingly popular approach is applying renewable energy sources to centuries-old electrolysis to split molecules of hydrogen — the most abundant element in the universe — from its bonds with oxygen.
An electrolyzer separates water into oxygen and hydrogen, effectively the opposite of a fuel cell, which uses water and electricity to separate hydrogen and oxygen,...
https://www.freightwaves.com/news/whats-behind-the-electrolyzer-craze-for-green-hydrogen