A detailed description of our proposed CDs photoredox-HAT dual catalytic system for Giese radical addition is outlined in Fig. . Critical to the success of this photoredox-HAT dual catalytic protocol is the generation of radicals with hydrogen atom abstraction (HAA) capacity, usually via an oxidative quenching pathway where the photocatalysts act as oxidants (ref . However, previous studies have only demonstrated CDs in redox catalysis as electron shuttles for reductive transformations (ref . As such, the first question for this CDs photoredox approach is whether the photo-excited state of the CDs catalyst is sufficiently oxidative to generate radicals from thiol or quinuclidine HAT catalysts (ref . Surface polarity engineering has long been recognized as an effective strategy for tuning band edge potentials in semiconductor thin films and QDs (Fig. ) .