Enhancement of the performance of Ge–air batteries under high temperatures using conductive MOF‐modified Ge anodes

Abstract Germanium (Ge)–air batteries have gained significant attention from researchers owing to their high power density and excellent safety. However, self‐corrosion and surface passivation issues of Ge anode limit the development of high‐performance Ge–air batteries. In this study, conductive metal‐organic framework (MOF) Ni 3 (HITP) 2 material was synthesized by the gas–liquid interface approach. The Ni 3 (HITP) 2 material was deposited on the surface of the Ge anode to prevent corrosion and passivation reactions inside the battery. At 16°C, the discharge time of Ge anodes protected with MOFs was extended to 59 h at 195 μA cm −2 , which was twice that of bare Ge anodes. The positive effect of MOFs on Ge–air batteries at high temperatures was observed for the first time. The Ge@Ni 3 (HITP) 2 anodes discharged over 600 h at 65.0 μA cm −2 . The experimental results confirmed that the two‐dimensional conductive MOF material effectively suppressed the self‐corrosion and passivation on Ge anodes. This work provides new ideas for improving the performance of batteries in extreme environments and a new strategy for anode protection in air batteries.