Enhanced photocatalytic CO₂ conversion of a CdS/Co-BDC nanocomposite via Co(ii)/Co(iii) redox cycling.

ABSTRACT: Photocatalytic CO₂ reduction into value-added chemical fuels using sunlight as the energy input has been a thorny, challenging and long-term project in the environment/energy fields because of to its low efficiency. Herein, a series of CdS/Co-BDC composite photocatalysts were constructed by incorporating CdS nanoparticles into Co-BDC using a dual-solvent in situ growth strategy for improving photocatalytic CO₂ reduction efficiency. The composites were characterized through XRD, SEM, TEM, XPS, DRS and EPR techniques in detail. 18% CdS/Co-BDC composites showed superior performance for the photocatalytic CO₂ reduction to CO, which was 8.9 and 19.6 times higher than that showed by the pure CdS and Co-BDC, respectively. The mechanism of enhanced photocatalytic CO₂ reduction performance was analyzed. The CdS/Co-BDC composites showed better adsorption for CO₂. Detailed analysis of XPS, transient photocurrent responses, and electrochemical impedance spectroscopy (EIS) shows the existence of strong charge interaction between CdS and Co-BDC and the photo-electrons of CdS can be transferred to Co-BDC. Additionally, Co-oxo of Co-BDC plays the role of a redox-active site and promotes the reduction performance via the method of valence transition of Co(ii)/Co(iii) redox.

SUBMITTER: Xuan R 

PROVIDER: S-EPMC11320058 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature