关键词: 氧化还原, H₂O₂, 电合成, 氮掺杂碳, 分级结构

Abstract: The two–electron oxygen reduction reaction (2e⁻ ORR) presents a promising route for the on-site production of hydrogen peroxide (H₂O₂), offering a green alternative to energy–consuming anthraquinone process. However, the high selectivity toward the competing 4e⁻ ORR over the desired 2e⁻ pathway leads to low Faradaic efficiency for H₂O₂, posing a critical challenge in catalyst design. In this work, a nitrogen–doped hollow hierarchical porous carbon with anchored Co atoms (Co−N/HPC) is constructed for high-performance H₂O₂ production. The Co−N/HPC catalyst shows excellent 2e⁻ ORR performance, achieving an H₂O₂ selectivity approaching 100% at an applied potential of 0.4 V (vs. RHE). Moreover, the in situ generated H₂O₂ proves highly effective in degrading organic pollutants, showcasing a dual-functionality for environmental remediation. Physical characterization and simulations confirm that the enhanced performance is attributed to the unique hierarchical structure, which facilitates fast electrolyte diffusion and boosts H₂O₂ selectivity. This work opens a new avenue for the design of advanced electrocatalysts that integrate efficient H₂O₂ production with direct application.

Key words: Oxygen reduction reaction, H₂O₂, Electrosynthesis, Nitrogen–doped carbon, Hierarchical structure