High Performance 3D Self‐Supporting Cu−Bi Aerogels for Electrocatalytic Reduction of CO2 to Formate

The electrocatalytic reduction of CO2 (CO2RR) to CO, formate, methane, and other high‐value compounds is a promising technique. However, current electrocatalysts suffer from drawbacks such as few active catalytic sites, poor selectivity and low stability, etc, which restrict the practical application. Although monatomic metal catalysts have been widely reported in recent years, high performance non‐noble metal aerogels were rarely investigated for electrocatalytic CO2RR. Herein, Cu−Bi aerogels with boosted CO2RR activity were well constructed by a simple one‐step self‐assembly method. The resultant Cu1Bi2 exhibits excellent CO2RR activity with high faradaic efficiency (FE) of 96.57 % towards HCOOH at a potential of −0.9 V vs. RHE, and the FEHCOOH remains over 80.18 % in a wide potential window (−0.8 V to −1.2 V vs. RHE). It demonstrated that the enhanced CO2RR activity of Cu−Bi aerogels could be attributed to the 3D self‐supporting structure of the catalysis, synergistic effect, and low interfacial charge transfer resistance. Networking at its best: The 3D self‐supporting nanonetwork structure of Cu−Bi aerogels provides abundant reactive sites and electron transport channels for efficient electrocatalytic reduction of CO2 to formate.