Sodium peroxide can be prepared on a large scale by the reaction of metallic sodium with oxygen at 130–200 °C, a process that generates sodium oxide, which in a separate stage absorbs oxygen: 4 Na + O₂ → 2 Na₂O.

Can you make your own peroxide?

Water + air + electricity = hydrogen peroxide.

How do you make sodium peroxide from NaCl?

(c) Sodium peroxide First, NaCl is electrolysed to result in the formation of Na metal (Downs process). This sodium metal is then heated on aluminium trays in air (free of CO₂) to form its peroxide.