CNT-ZIF۶۷ nanocomposite as a high performance electrocatalyst for Li-O۲ battery: Investigation of synthetic procedure and oxygen pressure.

Development of efficient electrocatalysts for oxygen reduction reaction in metal-air batteries is the major technological challenge of energy researchers. In this work, ZIF ۶۷ /carbon nanotubes composites were prepared via one pot synthesis and direct mixing procedures and effect of synthetic procedure and oxygen partial pressure on the performance of ZIF ۶۷ /carbon nanotubes as a catalyst for Li-O۲ battery was investigated. The synthesized CNT–ZIF ۶۷ nanocomposite was characterized using FT-IR, XRD, FE-SEM analyses. The Cyclic voltammetry, charge- discharge cycles and Electrochemical Impedance Spectroscopy (EIS) were also applied to study all fabricated electrodes using CNT–ZIF nanocomposites in two synthesis procedures. Electrochemical analysis results had shown that the CNT–ZIF compound synthesized via one pot and direct mixing procedures had a capacity of about ۹۰۸۳ and ۱۲۷۷ mA h/g electrode at a current density of ۲۰۰ mA/g respectively. And also a capacity of ۹۳۰۶ mA h/g active material was obtained from this battery utilizing a ۴ atm oxygen pressure. Result of the discharge curve showed that the difference of battery capacity in high current density is higher than the low current density for ۲ and ۴ atm oxygen pressures.