CdZnS/CoWO Nanohybrids with a Twinning Homojunction and an Interfacial S-Scheme Heterojunction for Efficient Visible-Light-Induced Photocatalytic CO Reduction.

The construction of a phase junction photocatalyst can significantly enhance the photocatalytic performance with high selectivity for CO reduction. In this study, an S-scheme junction CdZnS/CoWO semiconductor with the coupling of a twin crystal CdZnS homojunction and CoWO was designed through a hydrothermal method, which could convert CO to CO with high efficiency under visible-light illumination. CdZnS-10%CoWO exhibited the optimal performance and its CO yield and selectivity were up to 318.68 μmol·g and 95.90%, respectively, which were 4.54 and 1.62 times higher than that of twin crystal CdZnS. Moreover, the CdZnS homojunction with a zinc-blende and wurtzite phase and the S-scheme phase junction of CdZnS/CoWO enhanced the property of CO adsorption and accelerated the detachment of photogenerated carriers. The combination of photogenerated holes in CdZnS and the electrons of CoWO can retain the reduction sites to improve photocatalytic performance. This study provides a neoteric concept and reference for the construction of the S-scheme phase junction.