fig4

Figure 4. (A) Schematic illustration of the fabrication of the Co-N@Ti₃C₂T_X-Arg/S electrodes for Li-S batteries. (B) Rate performances of the Co-N@Ti₃C₂T_X-Ser/S, Co-N@Ti₃C₂T_X-Lys /S, and Co-N@Ti₃C₂T_X-Arg/S electrodes. (C) Long-term cycling of the Co-N@Ti₃C₂T_X-Ser/S, Co-N@Ti₃C₂T_X-Lys/S, and Co-N@Ti₃C₂T_X-Arg/S electrodes. (D) CEs of the Co-N@Ti₃C₂T_X-Ser/S, Co-N@Ti₃C₂T_X-Lys /S and Co-N@Ti₃C₂T_X-Arg/S electrodes at different rates. (E) Nyquist plots of the Co-N@Ti₃C₂T_X-Ser/S, Co-N@Ti₃C₂T_X-Lys /S and Co-N@Ti₃C₂T_X-Arg/S electrodes, and the inset shows the equivalent circuit and fitted results. (F) Decay rates of the Co-N@Ti₃C₂T_X-Ser/S, Co-N@Ti₃C₂T_X-Lys/S and Co-N@Ti₃C₂T_X-Arg/S electrodes.