Super‐Coordinated N4‐Ni1‐O2 for Selective H2O2 Electrosynthesis at High Current Densities

Electrochemical production of hydrogen peroxide (H 2 O 2 ) from O 2 on single atom catalysts has attracted great attentions, yet the quest for robust catalysts is driven by achieving >90% Faradaic efficiency (FE) under industrial-relevant current densities (>100 mA cm -2 ). Here we synthesize a catalyst contains single nickel coordinated four nitrogen and two oxygen – N 4 -Ni 1 -O 2 – by involving carboxyl functionalized multiwall carbon nanotubes as substrate to provide extra O coordination to regular Ni-N 4 . We present a cathodic energy efficiency of ~80% and a H 2 O 2 FE of ~96% at a current density of 200 mA cm -2 on N 4 -Ni 1 -O 2 /OCNTs catalyst, outperforming the reported single atom catalysts for H 2 O 2 electrosynthesis.