<p>Environmental pollution, energy shortage and greenhouse effect have become global problems. Electrocatalytic CO₂ reduction reaction (CO₂RR) is an effective means to solve these problems because of its advantages of high efficiency, energy saving and mild conditions. Among many catalytic materials, CdS materials have attracted extensive attention and research because of their simple preparation method and controllable morphology. However, the limited adsorption capacity of CdS for CO₂ seriously limits its application in the field of electrocatalysis. In this paper, catalyst CdS was prepared by simple hydrothermal synthesis method, and then effective high-performance catalysts CdS-F₁, CdS-F₂ and CdS-F₃ were prepared by F doping in different proportions, and the performance of their CO₂RR to produce CO was studied. The results show that the doping of F can significantly enhance the catalytic activity and CO₂RR performance of CdS catalyst. Catalyst CdS-F₂ has a suitable F doping amount, the smallest charge transfer resistance at the interface of materials, the largest electrochemical active area and excellent CO₂RR activity. It shows the highest Faraday efficiency at the potential of -1.3&#xa0;V versus reversible hydrogen electrode (vs. RHE), with a value of 98%.</p> Graphical Abstract <p></p>