Sunreign Reference: Photo Thermo Chemical Fuels

Photo Thermo Chemical Fuels

Photo Thermo Chemical Fuels are fuels that can be manufactured today using solar and thermal energy. There are a number of them:

Compound	Ingredients	Process	Economy?
Hydrogen	Water	Iron/Zinc/Nickel	Hydrolysis
Methanol	Hydrogen,CO2	KOH Hydrolysis	More here
Ammonia	Hydrogen, N2	Haber process	More here
Methane	Hydrogen,CO	Sabatier process	More here

source

I would advocate embracing only economies based on atmospheric capture of CO2 or no CO2 at all (Ammonia). Safety wise there is a clear winner : Ammonia. The risk associated with ammonia are about explosion of big tankers.

http://www.mpi.stonybrook.edu/energy/WaterSplitting/watersplitreview.pdf