Journal Article10.1021/JACS.7B05130
Discriminating Catalytically Active FeNx Species of Atomically Dispersed Fe–N–C Catalyst for Selective Oxidation of the C–H Bond
Wengang Liu,Wengang Liu,Leilei Zhang,Xin Liu,Xiaoyan Liu,Xiaofeng Yang,Shu Miao,Wentao Wang,Aiqin Wang,Tao Zhang +9 more
829
TL;DR: By using sub-ångström-resolution HAADF-STEM in combination with XPS, XAS, ESR, and Mössbauer spectroscopy, this work has provided solid evidence that Fe is exclusively dispersed as single atoms via forming FeNX and that the relative concentration of each FeNx species is critically dependent on the pyrolysis temperature.
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Abstract: Nanostructured Fe–N–C materials represent a new type of “platinum-like” non-noble-metal catalyst for various electrochemical reactions and organic transformations. However, no consensus has been reached on the active sites of the Fe–N–C catalysts because of their heterogeneity in particle size and composition. In this contribution, we have successfully prepared atomically dispersed Fe–N–C catalyst, which exhibited high activity and excellent reusability for the selective oxidation of the C–H bond. A wide scope of substrates, including aromatic, heterocyclic, and aliphatic alkanes, were smoothly oxidized at room temperature, and the selectivity of corresponding products reached as high as 99%. By using sub-angstrom-resolution HAADF-STEM in combination with XPS, XAS, ESR, and Mossbauer spectroscopy, we have provided solid evidence that Fe is exclusively dispersed as single atoms via forming FeNx (x = 4–6) and that the relative concentration of each FeNx species is critically dependent on the pyrolysis tempe...
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Citations
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References
Single-atom catalysis of CO oxidation using Pt1/FeOx
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TL;DR: Density functional theory calculations show that the high catalytic activity correlates with the partially vacant 5d orbitals of the positively charged, high-valent Pt atoms, which help to reduce both the CO adsorption energy and the activation barriers for CO oxidation.
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•Journal Article
High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt
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C–C, C–O and C–N bond formation via rhodium(III)-catalyzed oxidative C–H activation
Guoyong Song,Fen Wang,Xingwei Li +2 more
TL;DR: The facile construction of C-E (E = C, N, S, or O) bonds makes Rh(III) catalysis an attractive step-economic approach to value-added molecules from readily available starting materials.
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