Single‐Atom Catalysts for H2O2 Electrosynthesis via Two‐Electron Oxygen Reduction Reaction

Abstract

AbstractOxygen reduction reaction via the two‐electron route (2e− ORR) provides a green method for the direct production of hydrogen peroxide (H2O2) along with in situ utilization. The effective catalysts with high ORR activity, 2e− selectivity, and stability are essential for the application of this technology. Single‐atom catalysts (SACs) have attracted intensively attention for H2O2 electrosynthesis owing to the unique geometric and electronic configurations. In this review, the mechanism and theoretical predictions for 2e− ORR over SACs are first introduced. Then, the recent advances of various SACs for the electrosynthesis of H2O2 are documented. And the correlation between the central atom, coordination atoms, and coordination environment of SACs and the corresponding electrocatalytic ORR performance including activity, selectivity, and stability are emphatically analyzed and summarized. Finally, the major challenges and opportunities regarding the future design of SACs for the H2O2 production are pointed out.