Non-aqueous Na–O2 cells are constructed with Ag-RGO as a bifunctional catalyst. The 10th cycle discharge capacity is 566 mA h g−1 at 0.1 mA cm−2 with coulombic efficiency greater than 80%. XRD, EDAX and XPS studies of the oxygen electrode suggest that NaO2, Na2O2 and Na2O are the discharged products.
