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Question

How to do the electrolysis of liquefied CO?


Solution

A lot of energy would be required to 'decompose' the CO2. This would negate the energy which was obtained from burning the original Carbon.  You'd need to get that energy from somewhere else. 
It's a downhill process, I'm afraid. The same applies to splitting water to get hydrogen and oxygen. There's no such thing as a free lunch.

Of course plants have 'cracked it'. They use the energy in sunlight to produce their food - which is what we eat and the plants use. We'd not be here if it weren't for the plants.

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