This would only work for a utility scale "battery". People don't realize just how low of concentrations CO2 are in the atmosphere. There just isn't enough to pull out and capture without moving huge amounts of atmospheric air past the collector.
For this to work it would need a concentrated CO2 source, like, err, a coal plant...uh...ok so I'm sure a natural gas plant would provide enough. You would use green energy when it is plentiful(solar, daytime) to charge your ethanol "battery" and burn that at night when you have no green energy. Actually, thinking about it, you could possibly capture the emissions from burning the ethanol to re-use. So you might just need a large CO2 feedstock to get it going, or ethanol to start with. And probably lots to top up with, as I'm sure there would be a net CO2 loss.
Combing a natural gas plant, solar, wind and this tech you could probably make a a pretty decent self contained system. If it actually works, that is.
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