Laser‐Constructed RuO 2 /Fe 2 O 3 Composites for Efficient Photothermal Catalytic CO 2 Methanation Reaction

Abstract Photothermal catalytic methanation of carbon dioxide (CO 2 ) is a promising and sustainable method for carbon resource utilization. The efficiency of this process hinges on enhancing the photothermal conversion capacity and precisely designing the catalytically active sites. Here, a laser synthesis strategy is proposed to construct the RuO 2 /Fe 2 O 3 heterostructure by laser etching to build a grooved Fe 2 O 3 substrate and depositing RuO 2 nanoparticles. RuO 2 /Fe 2 O 3 combines the wide‐spectrum absorption capacity of Fe 2 O 3 substrates (reaching 209.2 °C under light irradiation with a light intensity of 1.83 W cm −2 ) and the catalytic activity of RuO 2 , enabling CO 2 to have the ability of selective hydrogenation. Combined with the catalyst characterization and the catalytic experimental results, RuO 2 /Fe 2 O 3 is confirmed to be a photothermal catalyst with excellent catalytic performance and stability for CO 2 methanation (CH 4 selectivity and yield are 96% and 795 µmol cm −2 h −1 , respectively). This work provides a versatile platform for designing multi‐functional catalytic systems by laser‐assisted strategy, opening new avenues for solar‐driven CO 2 valorization.