Reverse quantum wells in gradient-doped CdS for photocatalytic H 2 O 2 production

Gradient Mn-doping in CdS forms reverse quantum wells and surface active sites, which enhance charge extraction and O 2 activation. This achieves a H 2 O 2 production rate of 1874 μmol g −1 h −1 and an apparent quantum efficiency of 65.2% at 475 nm.