Synthesis of rGO/g-C3N4 Composite Cathodes for Li – Ion – Oxygen Battery

Abstract

The low-cost electro-catalysts are very crucial for the lithium-ion oxygen battery electrodes. In this work porous reduced graphene oxide (rGO) was synthesized by the chemical methods and mixed with melamine to obtain rGO/graphitic-C3N4 (g-C3N4) composite which compose of 50% rGO and 50% g-C3N4. SEM, XRD and FTIR characterizations showed that the synthesized composite structure reflected most of the features of the rGO structure. The synthesized rGO/g-C3N4 composite was prepared as the cathode for the Li-ion-oxygen battery and its discharge/charge performance was determined. The composite cathode demonstrated a distinctive performance since g-C3N4 catalyzed both the oxygen reduction and oxygen evolution reactions during the discharging and charging. This work showed that rGO/g-C3N4 composite electrode was quite promising as the cost-effective cathode for the Li-ion-oxygen batteries.

Correlations of Precursor and Carbon Coating with Electrochemical Property of 2D Graphitic Carbon Nitride (g-C3N4) Nanosheets as High-Reversibility Cathode of Nonaqueous Al-Ion Batteries

“…Recently, N-doped carbon (N–C) derived from different carbon sources such as dopamine, , fulvic acid, , and chitosan , has been developed as an excellent coating material to enhance the electrode performances of lithium batteries, and it has shown high promise as the coating material of g-C 3 N 4 for high-performance AIBs. In this work, we report g-C 3 N 4 nanosheets with N-doped coating is an efficient NAIB cathode. − With the optimal carbon content of 20%, the final NAIBs integrating the g-C 3 N 4 @N–C cathode and Al metal anode in the AlCl 3 /[EMIm]Cl (1.3/1.0) electrolyte deliver an initial capacity of ∼54.9 mAh·g –1 at 0.2 C with high Coulomb efficiencies of ∼99.9% and possess long-term reversibility over 200 cycles.…”