Advances in Tandem Strategies for CO₂ Electroreduction: From Electrocatalysts to Reaction System Design

Abstract The electrochemical reduction of CO 2 (CO 2 RR) offers the opportunity to store renewable energy in the form of chemicals and fuels while simultaneously reducing CO 2 emissions. Compared to low carbon products such as carbon monoxide and formic acid, multicarbon products have demonstrated greater value in terms of economic feasibility. To date, various strategies have been developed to enhance electrocatalytic performance, with tandem strategies emerging as a promising approach, particularly for the formation of multicarbon products. In this review, current tandem strategies regarding CO 2 RR are thoroughly discussed, covering electrocatalyst designs from atomic‐scale tandem electrocatalysts to macroscale electrode configurations as well as reaction system designs. Additionally, the internal reaction processes involving reduction product upgrades, the application of multi‐physical tandem fields, and the tandem reaction systems are further summarized. This review aims to provide more fundamental insights into tandem strategies for CO 2 RR applications and inspire more creative ideas in the research community of CO 2 RR in light of this promising approach with its wide versatility, diversity, and flexibility.