Abstract
We propose a strategy to synthesize ternary CdS/UiO-bpy/Co composites by integration of CdS and molecular redox catalysts through metal-organic framework (MOF) UiO-bpy. The CdS/UiO-bpy/Co composites were very effective for photocatalytic conversion of CO2 to CO under visible light irradiation. The evolution rate of CO could reach 235 μmol g-1 h-1, which was a 10.2-fold improvement compared to that for the parent CdS, and selectivity for CO was 85%. The outstanding performance of the CdS/UiO-bpy/Co composites resulted from promoting the separation and migration of photo-induced charge carriers, enhancing the adsorption of CO2 molecules, and offering abundant active sites for CO2 reduction. As far as we know, this is the first study to integrate inorganic semiconductors and molecular redox catalysts through MOFs.
Highlights
Global energy demand and climate change have underpinned broad interest in the sustainable reduction of CO2 into value added carbon products, such as CO, alcohols, and hydrocarbons
The synthesized Cadmium sul de (CdS)/UiO-bpy samples and cobalt chloride were added into tetrahydrofuran (THF) solvent at room temperature and stirred for 12 h
A typical absorption band in the region of 600–800 nm corresponding to the Co complex in the UV/vis spectrum was observed, as shown in Fig. S8.† It was con rmed that the absorption properties are similar to those of the corresponding homogeneous complex Co-bpy, indicating that the Co atoms were coordinated with the ligands of bpydc, which was further supported by the X-ray photoelectron spectroscopy (XPS) survey spectra in Fig. S9.† The N 1s XPS spectra of CdS/UiObpy shi ed to higher binding energies by 0.16 eV a er the Co atoms were loaded into the CdS/UiO-bpy, suggesting that the surface chemical states of N atoms were changed by the loaded Co atoms, due to the interaction between the N atoms and Co atoms in the CdS/UiO-bpy/Co composites
Summary
Global energy demand and climate change have underpinned broad interest in the sustainable reduction of CO2 into value added carbon products, such as CO, alcohols, and hydrocarbons. We propose a strategy to synthesize ternary CdS/UiO-bpy/Co composites by integration of CdS and molecular redox catalysts through metal–organic framework (MOF) UiO-bpy.
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