Tandem Catalysis for Electrochemical CO ₂ Reduction to C ₂₊ Products

Electrochemical CO 2 reduction to multicarbon (C 2+ ) products represents a promising route for sustainable chemical synthesis. However, the complex multielectron/proton transfer process required for C 2+ generation renders single‐catalytic systems inherently limited in optimizing all reaction steps concurrently. Tandem catalysis addresses this constraint by decoupling the overall conversion into two discrete stages: initial CO 2 ‐to‐CO conversion and subsequent CO‐to‐C 2+ coupling. This review systematically summarizes recent advances in tandem CO 2 ‐to‐C 2+ , covering fundamental mechanisms, catalyst design strategies, and two main tandem configurations: integrated tandem catalysis in a single electrolyzer and sequential tandem catalysis in series electrolyzers. The benefits of tandem catalysis in enhancing reaction kinetics, mass transport, and energy efficiency for C 2+ generation are systematically elucidated. Finally, the remaining challenges and future opportunities are outlined for scaling tandem catalysis, highlighting its potential to improve the economic viability of CO 2 ‐to‐C 2+ conversion.