I had a crazy idea and did aliterate search. It's doable and people use oxalic acid as the medium. It's a solid, you can get around $5-$6 / pound. You can use as little energy as a AA battery to form CO2. I'm not sure how fast or much it generates CO2 but it's worth a test. We'd have to build a nifty PVC chamber, maybe with a clear acrylic tube to see what's going on inside. I think I read the oxalis acid turns into a liquid as the CO2 is broken out of the molecule. Or maybe a cheaper medium would be baking soda, NaCO3?
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