. Preparation and characterization of Co-SiO₂

. XRD patterns of (a) ZIF-67, ZIF-67-SiO₂, and (b) Co and Co-SiO₂

. (a) Diffuse reflectance spectra of Co-SiO₂ and Co (insets showing photographs of two catalysts), (b) dependence of calculated normalized extinction cross-section of Co nanostructures on the number of Co nanoparticles (n) in the chain, and surface temperature of (c) Co catalyst and (d) Co-SiO₂ catalyst

. Catalytic activity and CO selectivity of Co-SiO₂ under different light intensities

. Stability of Co-SiO₂ and Co in thermocatalytic CO₂ hydrogenation at 300 ℃

. (a) TEM image and (b) particle size distribution of spent Co-SiO₂

Table 1. CO₂ conversion efficiencies of different catalysts in photothermal hydrogenation of carbon dioxide