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The idea is sound, and there are quite a few ways to turn CO2 and H2 into some form of hydrocarbon fuel... but the problem has always been energy, energy, energy.
The product is probably going to be some form of synthetic gas or simple hydrocarbon. Sucks that they don't state what it is on the page (or is it a telling sign that they don't?), so we can't figure out HOW energy intensive the process will be.
The advantage of this over simply storing energy in batteries or simply storing the hydrogen is the portability of the resulting fuel. The trade-off is the energy spent in making the fuel.
Would probably make sense for refilling stations out in the middle of nowhere that would need to hold on to stocks for a long time.
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