The electrosynthesis of H2O2 production via the two-electron oxygen reduction reaction (2e-ORR) has attracted increasing attention. In this work, a novel Ni-N-C single-atom catalyst (SAC) with Ni-N4O1 coordination and a C-O-C synergistic structure is screened out. The corresponding SAC is then synthesized via chelation annealing. During the 2e-ORR test, the Ni-NOC exhibits an H2O2 selectivity of 92.7% at 0.5 V vs. reversible hydrogen electrode (RHE), and the H2O2 production rate can reach 252.91 mmol h−1 g−1 with a TOF of 0.187 s−1, which is among the best Ni-N-C catalysts. In addition, the cathodic 2e-ORR on this SAC is successfully coupled with the anodic oxidation of 5-HMF, and an overpotential of 0.32 V is achieved for 5-HMF oxidation at 50 mA, much smaller than the traditional oxygen evolution reaction (OER) process. Hence, this work provides a promising strategy for designing highly active 2e–ORR SACs as well as a novel coupling system of H2O2 production and 5-HMF electrooxidation.

中文翻译：

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模拟引导的富氧配位环境原子镍催化剂用于 H2O2 电合成与 5-HMF 氧化


通过双电子氧还原反应（2e-ORR）电合成生产H2O2引起了越来越多的关注。本工作筛选出一种具有Ni-N4O1配位和COC协同结构的新型Ni-NC单原子催化剂（SAC）。然后通过螯合退火合成相应的 SAC。在2e-ORR测试中，Ni-NOC相对于可逆氢电极（RHE）在0.5 V时表现出92.7%的H2O2选择性，H2O2产率可达252.91 mmol h−1 g−1，TOF为0.187 s−1，这是最好的 Ni-NC 催化剂之一。此外，该SAC上的阴极2e-ORR与5-HMF的阳极氧化成功耦合，在50 mA下5-HMF氧化实现了0.32 V的过电势，远小于传统的析氧反应（OER） ） 过程。因此，这项工作为设计高活性 2e-ORR SAC 以及 H2O2 生产和 5-HMF 电氧化的新型耦合系统提供了一种有前途的策略。