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The authors would like to acknowledge Agnieszka Jarosz-Duda and Paulina O’Callaghan for the synthesis of UCPs. This work was supported by the National Science Center, Poland, within the Sheng 1 project
(2018/30/Q/ST5/00776). The study was carried out using research infrastructure funded by the European Union in the framework of the Smart Growth Operational Programme, Measure 4.2; Grant No.
POIR.04.02.00-00-D001/20, “ATOMIN 2.0 – Center for materials research on ATOMic scale for the INnovative economy”.
The influence of copper doping of cadmium sulfide on the activity in composites with TiO2 (anatase) for photocatalytic CO2 reduction was examined. CdS and (Cu,Cd)S were synthesized by the hydrothermal method and characterized using XRD, XPS, SEM, EDS, and XRF methods. It was found that copper doping is responsible for the shift of band edge potentials. The mechanisms of photocatalytic performance of the created heterojunctions were elucidated with photoelectrochemical, spectroelectrochemical and surface photovoltage techniques. The S-scheme heterojunction was recognized for both examined systems. The obtained composites were examined under Xe-lamp radiation in the gas phase revealing CO2 reduction to CO. Moreover, the photocatalytic performance under NIR irradiation was demonstrated with the use of the upconverting nanoparticles (UCPs) added to the photocatalytic system. It was found that Cu doping improved the photocatalytic performance of CdS/TiO2 in CO2 to CO conversion mainly through the increase of the photostability of the sulfide system.
