Fig. 5.

Photothermal CO₂ methanation performance of the SA Ni/Y₂O₃ nanosheets with a selective light absorber-assisted photothermal system. a Spatial temperature mapping of the selective light absorber-assisted quartz tube coated with the SA Ni/Y₂O₃ nanosheets under 1.0 kW m⁻² of simulated solar irradiation obtained by an infrared camera. b The temperature and CO₂ conversion achieved by the SA Ni/Y₂O₃ nanosheets with the selective light absorber-assisted photothermal system under different intensities of simulated solar light. c The solar flux over time on June 30, 2018 from 8:00 to 18:00 in Baoding, Hebei, China. d The corresponding photothermal CO₂ conversion over the SA Ni/Y₂O₃ nanosheets with the selective light absorber-assisted photothermal system as a function of time. Reaction conditions: 100 ml min⁻¹ of reaction gas (2.5% CO₂+ 10% H₂+ 87.5% N₂), 100 mg of catalyst