Advancing Lithium–Oxygen Battery Technology with an Iron–Nitrogen‐Doped Mesoporous Core–Shell Carbon Cathode Loaded with Ruthenium(IV) Oxide Nanoparticles

An iron‐nitrogen‐doped core–shell mesoporous carbon support loaded with a RuO 2 catalyst was used as a Li–O 2 cathode. Corrosion and degradation problems were avoided by doping carbon with iron and nitrogen. Well‐dispersed RuO 2 in the hierarchical porous structure facilitated a reversible nanoscale solid‐phase reaction. At 2.0 A g −1 (on the basis of catalyst plus carbon support), a capacity of 10 Ah g −1 was demonstrated with a discharge potential of 2.4 V and a corresponding recharge potential of 3.6 V. On the other hand, at 1.0 A g −1 , the discharge and recharge potentials are maintained at 2.5 V and 3.5 V, respectively, over 50 cycles.