RETRACTED: Improved Nitrogen-Doped Carbon Materials for High Performing Lithium Air Batteries

摘要

The development of lithium air batteries is attractive because metallic anodes and oxygenbased cathodes are used. Oxygen reduction reaction (ORR) at the cathode in lithium airbatteries is important in the control of electrolytic cell performance. However, even with theaid of platinum-based and commonly used noble metal catalysts, ORR still shows slowkinetics. In this current study, nitrogen-doped carbon materials were prepared by the postdoping technique in which NH3 and N2 gas were used as nitrogen precursors. Additionally,ball-milling was performed on the materials to increase porosity. Morphological, geometricand crystallographic characteristics of all the developed carbon materials were examined byfield emission scanning electron microscopy (FESEM), transmission electron microscopy(TEM), Xeray diffraction (XRD) spectroscopy, Brunauer-Emmett-Teller (BET) surface areasanalysis method, Xeray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR)spectroscopy and Raman spectroscopy were employed to examine the chemical composition and nitrogen doping. Cyclic voltammetry (CV) and rotating ringedisk electrode (RRDE)techniques were used to study electrocatalytic properties of the materials. Results obtainedrevealed that synthesized and ball-milled N-doped carbon black, (MN CB), N-doped KetjenBlack (MN KB), Carbon Black and Ketjen Black blend (MN B) show pure, mesoporousstructures with higher surface area than undoped samples. In comparison with commercialplatinum alloy (Pt/C), electrocatalytic activity for ORR improved with Nedoping andball-milling.