Platinum Single Atoms Strongly Promote Superoxide Formation in Titania-Based Photocatalysis - Platinum Nanoparticles Don't.

ABSTRACT: The selective reduction of molecular oxygen to superoxide is one of the key reactions in electrochemistry and photocatalysis. Here the effect of Pt co-catalysts, dispersed on titania, either as single atoms or as nanoparticles, on the photocatalytic superoxide (^•O₂ ^-) formation in O₂ containing solutions is investigated. The ^•O₂ ^- formation is traced by nitroblue tetrazolium (NBT) assays and in detail by EPR measurements using TEMPO as ^•O₂ ^- radical scavenger. The results show that the photocatalytic formation rate of ^•O₂ ^- on titania can strongly be enhanced by using Pt single atoms as a co-catalyst, whereas Pt nanoparticles hardly exhibit any acce

SUBMITTER: Wang Y 

PROVIDER: S-EPMC11922030 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature