In situ resource utilization of lunar soil for highly efficient extraterrestrial fuel and oxygen supply.

Building up a lunar settlement is the ultimate aim of lunar exploitation. Yet, limited fuel and oxygen supplies restrict human survival on the Moon. Herein, we demonstrate the in situ resource utilization of lunar soil for extraterrestrial fuel and oxygen production, which may power up our solely natural satellite and supply respiratory gas. Specifically, the lunar soil is loaded with Cu species and employed for electrocatalytic CO 2 conversion, demonstrating significant production of methane. In addition, the selected component in lunar soil (i.e. MgSiO 3 ) loaded with Cu can reach a CH 4 Faradaic efficiency of 72.05% with a CH 4 production rate of 0.8 mL/min at 600 mA/cm 2 . Simultaneously, an O 2 production rate of 2.3 mL/min can be achieved. Furthermore, we demonstrate that our developed process starting from catalyst preparation to electrocatalytic CO 2 conversion is so accessible that it can be operated in an unmmaned manner via a robotic system. Such a highly efficient extraterrestrial fuel and oxygen production system is expected to push forward the development of mankind's civilization toward an extraterrestrial settlement.