[masklinn]

> The device generates a lot of O2 as a "waste product" (obviously) so could this be a viable way to oxygenate an atmosphere?

Oxygenating atmospheres is easy (and obviously dangerous if you get high partial pressures), the issue is generally scrubbing CO2 out.

[stephengillie]

If you add enough oxygen, and keep adding oxygen, then eventually you'd get enough to breathe?

Earth air is mostly a mixture of 72% nitrogen, 24% oxygen, 6% carbon dioxide, and other stuff. Could humans breathe if they were in an environment that was 78% carbon dioxide and 24% oxygen? (IANADoctor)

[masklinn]

> If you add enough oxygen, and keep adding oxygen, then eventually you'd get enough to breathe?

If you add enough oxygen and keep adding oxygen, eventually everything is on fire.

> If you add enough oxygen, and keep adding oxygen, then eventually you'd get enough to breathe?

Nope. As the sibling comment noted, around 1% CO2 will start making people uncomfortable and stuffy (the human body is not sensitive to lack of oxygen so much as excess of CO2, that's why e.g. nitrogen suicide is almost painless), and concentrations above 7% CO2 start being lethal regardless of oxygen presence.

But CO2 has significant effects long before that, studies have shown decreased cognitive abilities starting at ~0.1% CO2.

[Vendan]

Survive? No way. C02 concentration is between 0.036% and 0.041%. 1% would be uncomfortable and cause you to be drowsy. 7%~10% would lead to suffocation.