Electrocatalytic two-electron oxygen reduction over nitrogen doped hollow carbon nanospheres

Hollow carbon nanospheres with abundant mesoporous structure and enhanced N configuration active sites can reduce O2 to H2O2 with an ultrahigh H2O2 yield rate of 7.32 mol gcat.−1 h−1 and a high faradaic efficiency of 96.7% in 0.1 M KOH.