High-Capacity Sodium Peroxide Based Na–O2 Batteries with Low Charge Overpotential via a Nanostructured Catalytic Cathode

The superoxide based Na–O2 battery has circumvented the issue of large charge overpotential in Li–O2 batteries; however, the one-electron process leads to limited capacity. Herein, a sodium peroxide based low-overpotential (～0.5 V) Na–O2 battery with a capacity as high as 7.5 mAh/cm2 is developed with Pd nanoparticles as catalysts on the cathode