Carbonized Metal Organic Framework Derived Co3O4/Carbon Nanofiber As the Cathode Material in the Non-Aqueous Li-Air Battery
Recently, there have been some attempts to produce carbon materials by simple carbonization of metal organic frameworks (MOFs) for energy storage systems. The sacrificial MOFs precursors were directly carbonized under inert atmosphere. The carbonized MOFs as cathode materials are known to have various advantages. Their structures can be designed and tunable in accordance with desired properties by selecting type of metal organic frameworks. Previous studies on metal oxide-carbon composites (Co3O4, RuO2, NiCo2O4, etc.) have demonstrated that they are good candidates as cathodes for Li-air battery with good electrochemical performances.
In this work, we demonstrate the application of the carbonized metal organic framework/Carbon nanofiber composites as the cathode material in non-aqueous Li-air battery. Various techniques including scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) were employed to characterize the morphology and crystalline structure of the framework system. The Brunauer-Emmett-Teller (BET) was utilized for the analysis of the surface area and porosity of the sample. The electrochemical properties of the carbonized metal organic framework/Carbon nanofiber composites as the cathode electrode in Li-air battery were studied using the galvanostatic charge-discharge characterization method. The synthesized carbonized metal organic frameworks/Carbon nanofiber composites show large specific surface area and narrow pore size distribution. It was shown that the open channel architecture of the metal organic framework enhances the oxygen gas supply to the interface between the electrolyte and the cathode surface.
This research was supported by the MSIP(Ministry of Science, ICT and Future Planning), Korea, under the “IT Consilience Creative Program” (NIPA-2014-H0201-14-1002) supervised by the NIPA(National IT Industry Promotion Agency)