Electrocatalytic oxygen reduction has emerged as a promising and environmentally sustainable method for the on-site production of hydrogen peroxide (H₂O₂). Herein, we designed and synthesized a series of porous carbon materials (SNC) with varied N and S doping ratios by using a facile pyrolysis method. Among them, the optimized catalyst exhibits excellent activity (2.1 mA cm^–2 at 0.2 V) for the two-electron oxygen reduction reaction (2e^– ORR) with high H₂O₂ selectivity of 68%. Carbon atoms near graphite N are revealed as the main active centers for 2e^– ORR catalysis. The impressive performance is attributed to the abundant graphitic N sites, the advanced porous structure resulting from S atom stripping, and the electronic effect caused by S codoping. This work highlights the importance of comprehensive optimization of activity and selectivity in designing 2e^– ORR catalysts and presents a facile and low-cost method for preparing heteroatom-doped carbon materials.

中文翻译：

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优化杂原子掺杂，通过氧还原高效生产过氧化氢

电催化氧还原已成为现场生产过氧化氢（H ₂ O ₂）的一种有前途且环境可持续的方法。在此，我们通过简单的热解方法设计并合成了一系列具有不同N和S掺杂比例的多孔碳材料（SNC）。其中，优化后的催化剂对双电子氧还原反应(2e ^{– ORR)表现出优异的活性(2.1 mA cm –2} at 0.2 V) ，H ₂ O ₂选择性高达68%。石墨 N 附近的碳原子被揭示为 2e ^– ORR 催化的主要活性中心。令人印象深刻的性能归因于丰富的石墨N位点、S原子剥离产生的先进多孔结构以及S共掺杂引起的电子效应。这项工作强调了活性和选择性综合优化在设计2e ^- ORR催化剂中的重要性，并提出了一种简便且低成本的制备杂原子掺杂碳材料的方法。