In photogenerated catalysis, the photocatalytic activity (PCA) depends on the ability of the catalyst to create electron–hole pairs, which generate free radicals (e.g. hydroxyl radicals: •OH) able to undergo secondary reactions.
I fotogenereret katalyse afhænger den fotokatalyserede aktivitet af katalysatorens evne til at skabe elektronhul-par, som genererer frie radikaler (dvs. hydroxyl radikale: •OH), som er i stand til at gennemgå et sekundært reaktionsforløb.