化学
催化作用
活动站点
杂原子
氧气
过渡金属
碳纤维
金属
解吸
氮气
吸附
磷
无机化学
物理化学
有机化学
材料科学
戒指(化学)
复合材料
复合数
作者
Kai Yuan,Dirk Lützenkirchen‐Hecht,Longbin Li,Ling Shuai,Yizhe Li,Rui Cao,Ming Qiu,Jinhui Zhu,Michael K.H. Leung,Yiwang Chen,Ullrich Scherf
摘要
Atomically dispersed transition metal active sites have emerged as one of the most important fields of study because they display promising performance in catalysis and have the potential to serve as ideal models for fundamental understanding. However, both the preparation and determination of such active sites remain a challenge. The structural engineering of carbon- and nitrogen-coordinated metal sites (M–N–C, M = Fe, Co, Ni, Mn, Cu, etc.) via employing new heteroatoms, e.g., P and S, remains challenging. In this study, carbon nanosheets embedded with nitrogen and phosphorus dual-coordinated iron active sites (denoted as Fe-N/P-C) were developed and determined using cutting edge techniques. Both experimental and theoretical results suggested that the N and P dual-coordinated iron sites were favorable for oxygen intermediate adsorption/desorption, resulting in accelerated reaction kinetics and promising catalytic oxygen reduction activity. This work not only provides efficient way to prepare well-defined single-atom active sites to boost catalytic performance but also paves the way to identify the dual-coordinated single metal atom sites.
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