Cu-MOF and CuBi Double-Perovskite Composites for Selective CO2 Electroreduction to HCOOH

One of the promising approaches to realize the anthropogenic CO₂ cycle and mitigate energy issues is electrochemical reduction of CO₂ to HCOOH; however, the development of electrocatalysts with high activity and selectivity toward HCOOH in a broad potential window is still a great challenge. In this sense, we designed Cu-MOF and CuBi double-perovskite composite catalysts and found that CuBi@Cu-MOF-15 with passivated urchin-like morphology achieved a maximum FE_HCOOH of 93% at a low applied potential of −1.1 V and a current density of 91.0 mA cm^–2. According to the in situ ATR-FTIR data, CuBi@Cu-MOF-15 is more favorable to stabilize *HCOO intermediates than Cu-MOF itself, which helps to promote the electrocatalytic reduction of CO₂ to HCOOH. This work will stimulate the creation of more sophisticated MOF-based electrocatalysts to support the use of CO₂ to produce liquid fuels.