透射电子显微镜
电催化剂
材料科学
碳纤维
兴奋剂
扫描透射电子显微镜
Atom(片上系统)
X射线光电子能谱
吸收光谱法
球体
氧原子
吸收(声学)
氧还原反应
结晶学
分析化学(期刊)
纳米技术
化学
电极
化学工程
电化学
物理化学
分子
光学
光电子学
复合数
有机化学
复合材料
物理
嵌入式系统
工程类
计算机科学
天文
作者
Min-min WANG,Chao Feng,Yun-qi LIU,Yuan Pan
标识
DOI:10.1016/s1872-5813(22)60067-7
摘要
We anchored atomically dispersed Fe-N4 sites on hollow N-doped carbon spheres (Fe SAs/HNCSs-800) for electrocatalytic ORR; the obtained material exhibited electrocatalytic activity and stability comparable to that of commercial Pt/C, with an onset potential of 0.925 V and a half-wave potential of 0.867 V. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption spectroscopy results confirmed the presence of highly dispersed Fe single atoms in Fe SAs/HNCSs-800. The results of experiments and theoretical calculations show that the single-atom dispersed Fe-N4 serve as the ORR active sites, and the adjacent C defects can effectively regulate the electronic structure of Fe atoms and improve the electrocatalytic ORR activity.
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