2023年12月19日 · Here, FeN 4 active sites electronically coupled with PtFe alloys (PtFe-FeNC) were successfully prepared by a vapor deposition strategy as an ultralow Pt loading (0.64 wt %) hybrid electrocatalyst. The FeN 4 sites on the FeNC matrix are able to effectively anchor the PtFe alloys, thus inhibiting their aggregation during long-life cycling.

2024年11月12日 · Herein, we report an atomically dispersed Fe – N – C catalyst with axial oxygen ligands (FeN 4 O/NC) synthesized for the first time by ultrafast Joule heating. The formation of oxygen species between FeN 4 and graphene …

2025年1月1日 · Recent experiments have revealed that the oxygen reduction reaction (ORR) performances of transition-metal and nitrogen codoped carbon (TM-N-C) can be drastically improved by interfacing with TM nanoparticles. However, the key factors that derive from this emerging composite SAC and can well correlate with the boosted ORR activity is still unclear.

2019年12月13日 · 在ZIF-8合成过程中掺杂少量的铁元素（Fe）能够形成分散性良好的FeN4配位结构，因此成为 FeN4活性位的理想载体。 ZIF-8基材料仅存在微孔结构，氧气无法在高电解质浓度的燃料电池催化电极内部快速传输质，通常只有催化剂表面的活性位能够参与催化反应过程，其内部深埋的活性中心难以参与ORR催化反应。 如果能在ZIF-8中构建分级有序多孔结构，将能很大程度上提高催化活性位利用效率、同时增强反应底物和催化产物在电极界面上的传质速率，进一步 …

Fine tuning of the coordination structure of FeN 4 has an essential impact on the catalytic performance. Herein, we construct a sulfur-modified Fe–N–C catalyst with controllable local coordination environment, where the Fe is coordinated with four in-plane N …

Electrochemical experimental results demonstrate that FeN 4 @porous carbon (FeN 4 @PC), featuring enriched asymmetric edge-FeN 4 active sites, exhibits higher acidic oxygen reduction reaction catalytic activity compared to FeN 4 @flaky carbon (FeN 4 @FC), where symmetric FeN 4 is primarily distributed within the basal-plane.

2022年1月10日 · Iron and nitrogen co-doped carbons (Fe–N–C) containing atomically dispersed FeN 4 moieties have been ever-increasing as the most promising alternative to commercialized platinum...

2023年3月1日 · An iron single-atom catalyst, composed of robust FeN 4 moieties anchored on a nitrogen-doped porous carbon matrix (Fe-SAC/NC), has been developed via a surfactant-coordinated metal-organic framework (MOF) approach for application in heterogeneous electro-Fenton (HEF) process.

2024年9月29日 · The FeN 4-Cl-Ti structure, formed within the Ti 4 N 3 Cl x /FePc composite, enables precise modulation of FeN 4 spin states from low to intermediate spin, significantly enhancing ORR performance. In contrast, the FeN 4-O …

2020年5月28日 · 近年来，非贵金属催化剂发展迅速，其中热解型的fen 4 位点具有较高的氧还原反应（orr）催化潜能。 然而，由于FeN 4 位点对ORR中间物种的吸附能过高，相比于Pt基催化剂，其活性仍难以望其项背。