One-step synthesized Bi5O7I for extremely low-temperature CO2 electroreduction

This work provides a scalable, one-step ultrasound-assisted reduction route, which prepares needle-tip Bi 5 O 7 I in a large quantity at ambient condition. At −50 °C, the Bi 5 O 7 I-based flow cells can operate with a formate selectivity >90% and a large partial current density.