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A comment on Direct conversion of CO2 to solid carbon by Gallium-based liquid metals. Parent comment

Re:Direct conversion of CO2 to solid carbon by Gallium-based... by marcosdumay on Tuesday January 18, 2022 @10:46PM (#29989728)
It's not a general rule for all capture processes, but on the case of solid carbon you do need to put back most of the energy yo get by burning the fuel.

Solid carbon is basically coal. It has more usable energy per mass than any hydrocarbon, and just a little bit less per carbon.

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Re:Direct conversion of CO2 to solid carbon by Gallium-based... by random314 on Wednesday January 19, 2022 @12:20AM (#29990273)
> you do need to put back most of the energy yo get by burning the fuel.

And we can get this energy from sunlight.

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Re:Direct conversion of CO2 to solid carbon by Gallium-based... by marcosdumay on Wednesday January 19, 2022 @11:46AM (#29996091)
Well, we can. But it would make no sense to deploy something like this before our electricity generation is decarbonized. Other capture processes do not share that issue.

But nobody is planning on deploying something like it currently anyway.

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