[SS] Cost of Hydrogen

Anthony · 07-27-2015, 12:30 AM

Producing hydrogen by electrolysis of water requires 285 kJ/mol or 142 GJ/ton or about 40 MWh, which is a couple thousand dollars at bulk electricity prices. Aqueous ammonia can be electrolyzed for a mere 27 GJ/ton; simple electrolysis won't work for methane and I'm not sure exactly what reactions are used. In space, I suspect icy asteroids containing ammonia ices are the easiest source of hydrogen.

07-27-2015, 12:30 AM	#8
Anthony Join Date: Feb 2005 Location: Berkeley, CA	Re: [SS] Cost of Hydrogen Producing hydrogen by electrolysis of water requires 285 kJ/mol or 142 GJ/ton or about 40 MWh, which is a couple thousand dollars at bulk electricity prices. Aqueous ammonia can be electrolyzed for a mere 27 GJ/ton; simple electrolysis won't work for methane and I'm not sure exactly what reactions are used. In space, I suspect icy asteroids containing ammonia ices are the easiest source of hydrogen. __________________ My GURPS site and Blog.