I would like to build a small carbon dioxide generator for experimental purposes. There are two requirements that are set in stone:
- It has to be electrochemical. (Easy to switch on/off with electricity.)
- It has to generate only one gaseous product, which is carbon dioxide. (No need to separate the gases, which might prove difficult.)
I have thought and tried using oxalic acid in a cell with a proton exchange membrane, which did not work. (And I have not figured out why so far.) I kept generating oxygen instead of carbon dioxide. Also the byproduct was hydrogen, which is problematic in my application, and the PEM is very fragile, so I could not build up any pressure. There are a few requirements, that are debatable. For example if a reactant or product is highly toxic or extremely expensive, that would possibly be a dealbreaker. Also it would be nice to be able to enclose the cell and build up a bit of pressure with carbon dioxide (only 1-2 bar).
Unfortunately researching this is rather difficult, since the main topic of research is binding carbon dioxide, which are 99.9% of the publications that pop up with the keywords I have searched for. Are there other things I could try? I have not tried a lot and I am already running out of ideas, but please bear with me, I am a theoretician and have not been in the lab for quite a long time.