“…However, when the temperature is too high, the breakdown of organic ligands could speed up, leading to the destruction of the internal structure of MOFs, thereby reducing degradation efficiency. 28,29 Fig. 4b shows the EIS and LSV diagrams of Co-Fe/N@BC prepared at different calcination temperatures and loaded on conductive glass, where the radius is the smallest at 800 °C, indicating the smallest resistance and the best electrochemical performance.…”