(Invited) Redox Chemistry of Li-Sulfur Batteries Investigated Via Electrochemistry, X-Ray Photoelectron Spectroscopy and Electron Paramagnetic Resonance

2017 ◽  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Photoelectron Spectroscopy ◽  
Redox Chemistry ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Electron Paramagnetic

Sequestered carbon on clay mineral probed by electron paramagnetic resonance and X-ray photoelectron spectroscopy

2006 ◽  
Vol 295 (1) ◽  
pp. 135-140 ◽  
Author(s):  
Kátia Cylene Lombardi ◽  
Antonio Salvio Mangrich ◽  
Fernando Wypych ◽  
Ubirajara Pereira Rodrigues-Filho ◽  
José L. Guimarães ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Clay Mineral ◽  
Photoelectron Spectroscopy ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Electron Paramagnetic

The redox chemistry of copper tetraphenylporphyrin revisited

2012 ◽  
Vol 16 (10) ◽  
pp. 1124-1131 ◽  
Author(s):  
Magal Saphier ◽  
Tova Yifrah ◽  
Israel Zilbermann ◽  
Oshra Saphier ◽  
Alexander I. Shames ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Redox Chemistry ◽  
Red Shift ◽  
Photoemission Spectroscopy ◽  
Free Base ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Electron Paramagnetic

Mixing Cu(II)Cl2 with free base tetraphenylporphyrin (( H2 (TPP)) in dry deaerated 1,2-dichloroethane surprisingly yields a mixture of Cu(II) (TPP) and Cu(III) (TPP). The later is long-lived in the absence of water and slowly decomposes within days to yield Cu(II) (TPP). Furthermore, in the presence of air, a slightly different CuIII porphyrin species forms, presumably, Cu(III) (TPP)•+, in which the Q-band is subject to a 10 nm red shift. The new Cu(III) (TPP) and Cu(III) (TPP)•+ differ in terms of absorption, fluorescence, electron paramagnetic resonance (EPR), and X-ray photoemission spectroscopy (XPS) when compared to the well-characterized Cu(II) (TPP), Cu(II) (TPP)•+, and Cu(II) (TPP)2+ species.

Jellyfish-like few-layer graphene nanoflakes: high paramagnetic response alongside increased interlayer interaction

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Alexander Ulyanov ◽  
Dmitrii Stolbov ◽  
Serguei Savilov
Keyword(s):  
Photoelectron Spectroscopy ◽  
High Sensitivity ◽  
Paramagnetic Centers ◽  
Interlayer Interaction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Graphene Nanoflakes ◽  
Few Layer Graphene ◽  
Electron Paramagnetic ◽  
Hydrocarbon Pyrolysis

Abstract Jellyfish-like graphene nanoflakes (GNF), prepared by hydrocarbon pyrolysis, are studied with electron paramagnetic resonance (EPR) method. The results are supported by X-ray photoelectron spectroscopy (XPS) data. Oxidized (GNFox) and N-doped oxidized (N-GNFox) flakes exhibit an extremely high EPR response associated with a large interlayer interaction which is caused by the structure of nanoflakes and layer edges reached by oxygen. The GNFox and N-GNFox provide the localized and mobile paramagnetic centers which are silent in the pristine (GNF p ) and N-doped (N-GNF) samples. The change in the relative intensity of the line corresponding to delocalized electrons is parallel with the number of radicals in the quaternary N-group. The environment of localized and mobile electrons is different. The results can be important in GNF synthesis and for explanation of their features in applications, especially, in devices with high sensitivity to weak electromagnetic field.

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