Yb‐Doped Cu‐Based Catalyst Boosting Electrochemical CO ₂ ‐to‐C ₂₊ Reduction Across pH Range at Ampere‐Level Current Density

Efficient electrochemical conversion of CO₂ to multi-carbon (C₂₊) products remains significant challenges, particularly under broad pH ranges and high-current-density conditions. Herein, we report ampere-level CO₂-to-C₂₊ electroreduction with exceptional efficiency across a wide pH range using ytterbium-doped CuO_x catalysts. The catalyst achieves Faradaic efficiency of 87 ± 2%, 77 ± 1%, and 78 ± 1% under alkaline, neutral, and acidic conditions, respectively. Electrochemical in situ infrared spectroscopy and Raman spectroscopy reveal that Yb-stabilizing Cu⁺ species and enriching *CO on Cu terrace sites are two critical factors for enhancing C─C coupling. This work not only develops a highly efficient electrocatalysts for sustainable C₂₊ production, but also establishes a doping strategy for stabilizing active sites and optimizing *CO adsorption configurations.