catalyst

decomposition of peroxide $H_{2} O_{2} (a q) \to 2 H_{2} O (l) + O_{2} (g) + heat$
process of this reaction happens as we speak, very very slowly (pilling holds bottle of hydrogen peroxide)
to store it put in the fridge (lowers temperature, lowers rate of reaction -> converse is true, higher temperature, higher rate of reaction)
you can buy hydrogen peroxide in chemist! (6%, we have 36% - which is corrosive
)
the activation energy for this reaction is quite high, as it reacts very slowly even in room temperature.

🌸 JACARANDA