This application would be good for solar, because it side steps that pesky variability.  However, there's a good reason solar isn't competitive.

More snake oil.

"Efficient" is a relative term for multi electron transfer processes.  There is always an overpotential, which means it always takes more energy than the reverse reaction.  I.e. It takes more energy than you could get burning it, even if that process was 100 percent efficient.  The authors are basically saying "this sucks less than other options..." but it's left unsaid that it still sucks.

Why not use solar power to do this then?

Exactly why the global warming/climate change people are full of shit.

This is actually really awesome.

Bring on the graphene economy.

I can turn CO2 into construction material

https://dilbert.com/strip/2019-02-03

You mean like that yellow thing in the sky that makes plants grow and turn co2 into oxygen?

Plants have been turning CO2 into carbon using solar power for billions of years.  Couldn't we just raise a bunch of algae, dehydrate it in the sun, and then dump the solids down a mine-shaft and accomplish the same thing?

My wild assed guess based on zero data would be slightly more (1.5-2 times) than what it takes for plants to synthesize sugar from CO2 and water.

how much electricity does it take to do it?

See, you burn coal, then run the energy through the dilithium crystals, then through the warp core.  You feed pure C02 into the warp core (which is badly de-tuned).  The warp core sends the C02 back in time (oh, you need an extremely high gravity field, did I mention that?) using the "Spock Effect".  The C02 is turned into more coal (in the distant past), which you mine and burn for more energy.

Simple.

Fusion can actually break even these days.

Which is pretty amazing.

A FACT seemingly LOST to a few recent generations.

How green the grass where yon cow farts?

https://www.sciencedirect.com/science/article/pii/S187770581500154X

Investigation of the Strength of Carbon-sand Mixture

The greatest stress that a composite soil can sustain is a critical value when dealing with slope stability, bearing capacity and lateral earth pressure. Cohesion and internal friction of soil composite particles will create tension and retain any stresses which are applied to the composite material. The soil composite will remain secure unless the applied external stress reaches its shear capacity. This research examined composite materials consisting of sand and various percentages of carbon. The sand used in this experiment was yellow sand which is available in Western Australia. For the purpose of testing strength, three different percentages of carbon (5, 10 and 15) were added and mixed homogenously with the sand. The strength of the composite material was tested using a small direct shear machine, in order to determine the effect of the presence of carbon on the soil strength. The experiment results provided evidences that the presence of carbon influenced the shear performance of the sand, with the shear strength of the sand-carbon composite being significantly lower than that of pure sand. The more carbon that was added to the mixture, the lower the shear strength. Carbon also takes up initial moisture content in the sand during the mixing process. The results of this research are potentially very useful in the geotechnical field, particularly with regard to construction sites containing carbon.

In other news, now that we have removed the evil CO2 from our atmosphere, plant life is dying.  Climate change is real man.  We need more CO2.  Better get the taxpayers to fund more CO2.

Let’s calm down a notch or two and see what they’re working at

https://newatlas.com/carbon-capture-co2-into-coal/58637/

There is no lunch at all if you don't read the actual research paper.  It uses very little energy.

Give me $4.9 Billion and I’ll start an electric car company.

Compared to what?

The miners will oppose this.

.
this whole thing just screams for massive government grants so they can show it is a stupid idea

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Fixed

Chirren.....for President