电催化剂
部分
铂金
化学
金属
碳纤维
氧气
原子轨道
Atom(片上系统)
催化作用
光化学
材料科学
电化学
物理化学
电极
立体化学
电子
物理
有机化学
复合材料
嵌入式系统
复合数
量子力学
计算机科学
作者
Aijuan Han,Xijun Wang,Kun Tang,Zedong Zhang,Chenliang Ye,Kejian Kong,Haibo Hu,Lirong Zheng,Peng Jiang,Zhao Chang-xin,Qiang Zhang,Dingsheng Wang,Yadong Li
标识
DOI:10.1002/anie.202105186
摘要
Abstract The modulation effect has been widely investigated to tune the electronic state of single‐atomic M‐N‐C catalysts to enhance the activity of oxygen reduction reaction (ORR). However, the in‐depth study of modulation effect is rarely reported for the isolated dual‐atomic metal sites. Now, the catalytic activities of Fe‐N 4 moiety can be enhanced by the adjacent Pt‐N 4 moiety through the modulation effect, in which the Pt‐N 4 acts as the modulator to tune the 3d electronic orbitals of Fe‐N 4 active site and optimize ORR activity. Inspired by this principle, we design and synthesize the electrocatalyst that comprises isolated Fe‐N 4 /Pt‐N 4 moieties dispersed in the nitrogen‐doped carbon matrix (Fe‐N 4 /Pt‐N 4 @NC) and exhibits a half‐wave potential of 0.93 V vs. RHE and negligible activity degradation (ΔE 1/2 =8 mV) after 10000 cycles in 0.1 M KOH. We also demonstrate that the modulation effect is not effective for optimizing the ORR performances of Co‐N 4 /Pt‐N 4 and Mn‐N 4 /Pt‐N 4 systems.
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