Selectively Electrochemical Reduction of CO2 Based on Metal Clusters Catalysts

The electrochemical CO 2 reduction reaction (eCO 2 RR) has emerged as a pivotal technology for addressing global climate challenges by converting CO 2 into value‐added chemicals, thereby contributing to carbon neutrality efforts. Metal nanoclusters, characterized by their atomically precise structures and unique electronic properties, have gained significant attention as highly tunable catalysts for eCO 2 RR due to their exceptional activity and selectivity. This review systematically summarizes recent advancements in metal nanoclusters for CO 2 conversion. First, the fundamental reaction mechanisms and pathways governing the formation of key products such as CO, formic acid, and hydrocarbons are elucidated. Next, the catalysts involved in eCO 2 RR, including noble metal (e.g., Au, Ag) and non‐noble metal (e.g., Cu, Ni) clusters are summarized, and the latest technical strategies for enhancing CO 2 reduction efficiency, such as alloying, ligand engineering, defect engineering, and heteroatom doping are presented. Finally, the challenges of metal nanoclusters in eCO 2 RR are discussed and future research directions and development prospects are outlined. This review puts forward the cutting‐edge design strategy of atomic‐level precise metal nanocluster catalysts in eCO 2 RR, which not only deepens the understanding of the basic science of electrocatalysis but also provides a feasible technical roadmap for realizing a sustainable CO 2 circular economy.