Lattice-Modulated Bi_0.1Ce_0.9O₂ Enabling Precise Intermediate Adsorption Tuning for H₂O₂ Electrosynthesis

The electrochemical production of hydrogen peroxide (H₂O₂) through the two-electron oxygen reduction reaction (2e^- ORR) is a sustainable and practical approach that enables efficient on-site generation and represents an extremely promising strategy for environmentally friendly production. Herein, we synthesized a Bidoped CeO₂ (Bi_0.1Ce_0.9O₂) catalyst via a one-step hydrothermal in situ self-assembly method. Both synchrotron radiation X-ray diffraction (SR-XRD) and theoretical calculation analysis demonstrate that Bi doping induces lattice expansion in CeO₂ and generates Ce/Bi dual active sites. Notably, Bi incorporation significantly enhances O₂ adsorption at Ce sites while weakening *OOH adsorption at Bi sites, thereby synergistically promoting the 2e^- ORR process. As expected, Bi_0.1Ce_0.9O₂ has attractive 2e^-ORR activity with 93.7% H₂O₂ selectivity, a H₂O₂ yield of 656 mmol g_cat^-1 h^-1, and good stability for 21 h. Additionally, its bleaching performance confirms practical applicability. This present study offers valuable insights into the rational development of high-efficiency rare-earth oxide catalysts for H₂O₂ production.