Electrocatalytic two-electron oxygen reduction reaction (2e⁻ ORR) is a promising method for producing green and sustainable H₂O₂ but lacks high selectivity and yields electrocatalysts. And it is critical to develop catalysts that meet industrial demands. Herein, we report the different ratios of Bi⁰/Bi³⁺ supported on a phosphorus, nitrogen, and carbon nanosheet (Bi/PNC), which can reduce O₂ to H₂O₂ with high selectivity (up to 97.75% at 0.4 V_RHE) in 0.1 M KOH electrolyte and retain 97% selectivity even after 100 h electrolysis. Then a homemade flow-cell system was built for electrocatalytic production of H₂O₂ under an O₂ atmosphere using an improved gas diffusion electrode. The Bi/PNC-4 can achieve a high H₂O₂ yield of 2.76 mol·g ⁻¹_catalyst ·h⁻¹ (alkaline), 5.29 mol·g ⁻¹_catalyst ·h⁻¹ (neutral), and 3.50 mol·g ⁻¹_catalyst ·h⁻¹ (acid) in universal pH conditions. The in-situ generated H₂O₂ can function as a degradation agent for efficiently degrading pesticides and antibiotics. The outstanding selectivity and activities are attributed to the synergistic effects of Bi⁰ and Bi³⁺ that promote proton-coupled reduction of O₂ to OOH* (ΔG_OOH* = 4.27 eV), and the formation of H₂O₂. The fast yield of H₂O₂ on Bi/PNC catalysts in flow-cell provides a promising path of electrocatalytic 2e⁻ ORR for practical H₂O₂ production.

电催化双电子氧还原反应 (2e ^{− ORR) 是一种很有前途的生产绿色和可持续 H} ₂ O ₂的方法，但缺乏高选择性和产量电催化剂。开发满足工业需求的催化剂至关重要。在此，我们报告了负载在磷、氮和碳纳米片 (Bi/PNC) 上的不同比例的 Bi ⁰ /Bi ^{3+ ，它可以将 O} ₂还原为 H ₂ O ₂并具有高选择性（在 0.4 时高达 97.75%） V _RHE ) 在 0.1 M KOH 电解质中，即使在电解 100 小时后仍能保持 97% 的选择性。然后构建了一个自制的流通池系统，用于电催化生产 H₂ O ₂在O ₂气氛下使用改进的气体扩散电极。Bi/PNC-4 可实现2.76 mol·g ^-1_催化剂·h ^-1（碱性）、5.29 mol·g ^-1_催化剂·h ^-1（中性）和 3.50 mol·的高 H ₂ O ₂产率g ⁻¹_催化剂·h ⁻¹（酸）在通用 pH 条件下。原位生成的H ₂ O ₂ 可作为高效降解农药和抗生素的降解剂。出色的选择性和活性归因于 Bi ⁰和 Bi ^{3+的协同作用，促进 O} ₂质子偶联还原为 OOH*（Δ G _{OOH* = 4.27 eV），以及 H 2} O ₂的形成。流通池中 Bi/PNC 催化剂上H ₂ O ₂的快速产率为实际 H ₂ O ₂生产提供了电催化 2e ^{- ORR 的有前景的途径。}