What has not been reported previously in the literature is the beneficial effect of Pt nanoparticles on the stability of the composite (i.e., the oxygen vacancies). Two explanations present themselves: (i) due to the presence of Pt particles on the Anatase phase, less electrons are transferred to the Rutile phase, necessary for oxygen reduction and reaction with the vacancies, and (ii) the vicinity of the Pt particles to the vacancies on the Rutile phase prevents re-oxidation by preferred oxygen adsorption (and reaction) over these Pt nanoparticles. Currently, we have no preference for one of these two options, and both might actually be relevant.