A tin-modified copper foam for the efficient and selective reduction of CO₂ to CO is reported. We employ a cost-efficient electrodeposition route to form a three-dimensional porous dendrite architecture, in which each dendrite possesses a copper core and a copper oxide/tin oxide shell. The sparse tin species on the electrode surface play a key role to achieve excellent faradaic efficiencies for CO formation with a maximum value of 94%. We demonstrate high CO partial current densities of 4.7 mA cm⁻² and 7.9 mA cm⁻² at applied potentials of -0.8 V and -1.1 V vs. the reversible hydrogen electrode, respectively. The high activity for electrochemical CO₂ reduction is attributed to the unique hierarchical porous structure, which offers abundant electrochemically active sites and facilitates mass transport.

报道了用于将CO ₂有效和选择性地还原为CO的锡改性的铜泡沫。我们采用具有成本效益的电沉积路线来形成三维多孔枝晶结构，其中每个枝晶都具有一个铜芯和一个氧化铜/氧化锡壳。电极表面上稀疏的锡物质起着至关重要的作用，可实现极佳的法拉第效率（最高94％的CO形成率）。我们证明了在相对于可逆氢电极的施加电压分别为-0.8 V和-1.1 V的情况下，分别具有4.7 mA cm ^-2和7.9 mA cm ^-2的高CO分电流密度。电化学CO ₂的高活性 还原归因于独特的分级多孔结构，该结构提供了丰富的电化学活性位点并促进了质量传递。