Ag–Pt Alloy Nanoparticles Modified Zn‐Based Nanosheets for Highly Selective CO₂ Photoreduction to CH₄

Abstract Multi‐electron involved photoreduction of CO 2 to hydrocarbon fuels is a long‐standing challenge, particularly in manipulating the selectivity of the target products. Here, a novel Ag–Pt bimetallic alloy on Zn‐based supports by photo‐deposition is designed for photocatalytic CO 2 reduction to CH 4 without any additives. This photocatalyst exhibits ≈ 98.9% selectivity for CH 4 . Experimental and theoretical calculations demonstrated that the excellent performance of the photocatalyst can be attributed to the localized surface plasmon resonance effect of metals, as well as the synergistic effects of the bimetallic sites. These factors are found to be beneficial not only for capturing solar radiation and facilitating electron migration but also for promoting the adsorption and activation of CO 2 and the protonation of *CO. As a result, the photocatalyst achieved high selectivity and activity of photoreduction of CO 2 to CH 4 . This work provides insights into the design of photocatalysts with highly selective target products for CO 2 reduction.