Atomically Dispersed Fe Motif-based Electrocatalysts for Hydrogen Peroxide Synthesis

The cathodic two-electron (2e⁻) oxygen reduction reaction (ORR) has garnered much attention for electrosynthesis of hydrogen peroxide (H₂O₂). The transition metal single-atom catalysts (SACs) with tunable geometry structure and electron layout have displayed promising potential in this process. Notably, atomically dispersed Fe−based electrocatalysts have been recognized as high-activity yet poor-selectivity catalysts in 2e⁻ ORR due to the high binding energy with the intermediates to break the peroxy bond into H₂O. In this Concept, we briefly review the Fe SAC in 2e⁻ ORR for H₂O₂ production by introducing their fundamental mechanism, chemical process, experimental advancements, and practical applications. The issues encountered and corresponding suggestions are discussed. The customized and tailored isolated Fe motif could fulfill the high activity, selectivity and stability system for H₂O₂ synthesis.