Electrocatalytic CO₂ reduction reaction (CO₂RR) is one of the important ways to achieve the goal of CO₂ utilization and synthesizing high-value products. Electrochemical CO₂RR involves multiple electron-proton transfer steps, resulting in low yield and low selectivity. *CO is considered as the key intermediate, the process of CO₂RR can be divided into a tandem step of CO₂-to-CO and CO-to-C₂₊. To promote kinetic rate of whole reaction and improve faraday efficiency of the product, tandem catalysts are constructed. Here, the recent advances in application of tandem catalyst for electrocatalytic CO₂RR are reviewed for three aspects: (1) tandem mechanism of electrochemical CO₂RR; (2) copper-based tandem catalysts as well as other copper-free tandem catalysts for electrochemical CO₂RR; (3) challenges, opportunities and prospects of tandem catalysts for CO₂RR. This review provides a comprehensive understanding tandem electrocatalytic mechanism of tandem catalysts for CO₂RR and important guidelines for the field of electrocatalysis.

电催化CO ₂还原反应(CO _{2 RR)是实现CO 2}综合利用和合成高价值产品目标的重要途径之一。电化学CO ₂ RR涉及多个电子-质子转移步骤，导致产率低、选择性低。_{*CO被认为是关键中间体，CO 2} RR的过程可分为CO ₂ -to-CO和CO-to-C ₂₊的串联步骤。为了提高整个反应的动力学速率并提高产物的法拉第效率，构建了串联催化剂。本文从三个方面综述了串联催化剂在电催化CO ₂ RR中应用的最新进展：(1)电化学CO ₂ RR的串联机理；_{(2)用于电化学CO 2} RR的铜基串联催化剂以及其他无铜串联催化剂；_{(3)CO 2} RR串联催化剂的挑战、机遇和前景。_{该综述为CO 2} RR串联催化剂的串联电催化机理提供了全面的了解，并为电催化领域提供了重要指导。