But this is perfect. A complete reversion of the reaction, without any additional interesting inputs or intermediate stages.
You can imagine a closed-cycle, isolated "battety" that discharges into sparkling water, and charges back into fuel and oxygen.
This is exactly the miracle solution that can turn CO₂ back into fuel, which can be burned again in existing ICEs and gas turbines, then turned into fuel again, powered by solar electricity.
Collecting and concentrating the CO₂ is going to be a task in itself, but things like power plants or steelmaking furnaces offer high-concentration, pre-heated CO₂.
that would be cool, but wouldn't something simpler like electrolysis of water into hydrogen/oxygen work much better?
I haven't the effort to do the math, but it would require less steps, less complexity, and less cutting edge catalysts with unknown lifetimes
It's hugely inefficient, so it requires more solar power.
Hydrogen is hard to store and use; unlike propane, it penetrates through plastics and even metals. Hydrogen is a good rocket fuel if you need top performance and cost is no object.
Propane is very convenient, and can be reused across the existing LNG infrastructure.
Hydrogen is very difficult to use as a direct fuel source. This recent video gives a good overview of all the challenges a hydrogen engine has to overcome: https://youtu.be/DGL5g91KwLA
You can imagine a closed-cycle, isolated "battety" that discharges into sparkling water, and charges back into fuel and oxygen.
This is exactly the miracle solution that can turn CO₂ back into fuel, which can be burned again in existing ICEs and gas turbines, then turned into fuel again, powered by solar electricity.
Collecting and concentrating the CO₂ is going to be a task in itself, but things like power plants or steelmaking furnaces offer high-concentration, pre-heated CO₂.