Promoted photocarrier transfer and increased active sites for optimal CO2-to-CH4 photoconversion via the modification of atomically dispersed transition metal ions in CdZnS nanocrystals

Atomically dispersed transition metal ion doped CdZnS nanocrystals were synthesized to delicately tune the selectivity for CO2 photoreduction to CH4, among which the CZS–Cu2+ achieved an excellent CO2-to-CH4 conversion rate of ca. 665.9 μL h−1 g−1 with a high selectivity of ca. 79.7% under visible irradiation.