The carbon-based catalysts exhibit excellent electrocatalytic and stable performance toward oxygen reduction reaction (ORR), which are expected to replace expensive and scarce Pt-based catalysts. However, how to regulate the interaction between silver and carrier carbon dots (CD) to improve electrocatalytic performance toward oxygen reduction reaction (ORR) and stability, has not been systematically studied. In this study, we in-situ synthesized fluorine and nitrogen co-doped CD anchoring Ag nanoparticles by UV irradiation reduction method. The peak potential, onset-potential and half-wave potential of F, N-CD@Ag-0.1 are 0.85 V, 1.056 V, and 0.9 V, respectively, indicating outstanding ORR performance. The current density of F, N-CD@Ag-0.1 remains 97.5 % after 50, 000 s, showing more excellent stability than Pt/C. The impressive ORR catalytic activity and stability of F, N-CD@Ag-0.1 could be attributed to the strong anchoring effect of nitrogen-doped CD on Ag. This effect leads to a significant interaction and charge transfer between Ag and CD, thereby enhancing the charge transfer process during the catalytic reaction. This project aims to design a carbon dot/silver composite catalyst with high ORR catalytic performance and favorable stability. The implementation of this project provides good theoretical guidance for the design of carbon nanomaterial-based catalytic systems.

中文翻译：

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有缺陷的F和N共掺杂碳点锚定银纳米颗粒的配位工程促进氧还原反应


碳基催化剂对氧还原反应（ORR）表现出优异的电催化和稳定的性能，有望取代昂贵且稀缺的铂基催化剂。然而，如何调节银与载体碳点（CD）之间的相互作用以提高氧还原反应（ORR）的电催化性能和稳定性，尚未得到系统研究。在本研究中，我们通过紫外辐照还原法原位合成了氟和氮共掺杂的CD锚定银纳米颗粒。 F、N-CD@Ag-0.1的峰值电位、起始电位和半波电位分别为0.85V、1.056V和0.9V，表明其具有出色的ORR性能。 F, N-CD@Ag-0.1在50, 000s后电流密度仍保持在97.5%，表现出比Pt/C更优异的稳定性。 F, N-CD@Ag-0.1 令人印象深刻的 ORR 催化活性和稳定性可归因于氮掺杂 CD 对 Ag 的强大锚定效应。这种效应导致Ag和CD之间发生显着的相互作用和电荷转移，从而增强催化反应过程中的电荷转移过程。本项目旨在设计一种具有高ORR催化性能和良好稳定性的碳点/银复合催化剂。该项目的实施为基于碳纳米材料的催化体系的设计提供了良好的理论指导。