Bimental composites for photocatalytic reduction of CO2 to CO in the near-infrared region by SPR effect
A major challenge in the field of photocatalytic carbon dioxide (CO2) reduction is to design catalyst systems featuring high selectivity for CO production, long-term stability and a composition of earth-abundant elements. Here, we present a metal-organic framework (MOF) based catalyst to mitigate the mentioned technical problems. We report the carbon-coated CuNi alloy nanocatalyst by vacuum high temperature treatment of MOF material (CuNiBTC). The resulting carbon encapsulated CuNi (denoted as CuNi/C) nanoparticles possess a well-designed core-shell composite structure with graphene shells. Meanwhile, we investigated the reaction mechanism of CO2 on the surface of CuNi/C photocatalyst in aqueous solution containing triethanolamine. The experimental results show that the activity and catalytic yield of CuNi/C are much higher than those of Cu/C and Ni/C alone. At the same time, the catalytic activity of CuNi/C is also affected by changing the reaction temperature in the preparation process. As a result, the CuNi/C samples can achieve near 90% selectivity for NIR-light-driven CO2 reduction to CO. Our approach demonstrates the potential for non-semiconductor materials as catalysts for efficient and selective reduction of CO2 to CO.