Results 161 to 170 of about 484 (218)

Spatially Coupled Cl2 Confinement and Activation at Curved Ni Single‐Atom Sites for Highly Reversible Li–Cl2 Batteries

Angewandte Chemie, EarlyView.
A robust cathode featuring curvature‐engineered Ni single‐atoms anchored within hierarchical pores effectively confines Cl2 and accelerates Cl0/Cl−1 redox kinetics. This synergistic architecture unlocks the potential of Li‐Cl2 secondary batteries with an unprecedented 1×106 mAh g−1 cumulative capacity, all‐climate resilience (–40°C to + 70°C), and 7.65
Minggang Xie, Keren Jiang, Xuehai Tan, Xuesong Xie, Zheng Cheng, Xianbin Meng, Yuxuan Xue, Yi Guan, Zhixuan Chen, Yifan Li, Renfei Feng, Zhi Li   +11 more
wiley   +1 more source

Functionalization‐Mediated Synthesis of Bridge‐Coordinated Fe Atoms on MoS2 Nanosheets for PEM Water Electrolyzers

Angewandte Chemie, EarlyView.
We report a functionalization‐mediated strategy to synthesize robust iron (Fe) atoms selectively coordinated at bridge sites on molybdenum disulfide (MoS2) nanosheets. The resulting b‐Fe‐MoS2 catalyst exhibits enhanced activity and durability for the hydrogen evolution reaction in proton exchange membrane water electrolyzers compared to atop ...
Zakaria Anfar, Haitham Maslouh, Yuwei Yang, Mathilde Moderne, Jiefeng Liu, Loïc Assaud, Mikhael Bechelany, Chrystelle Salameh, Kun Qi, Yuying Meng, Huali Wu, Ji Li, Nicholas M. Bedford, Damien Voiry   +13 more
wiley   +1 more source

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EXAFS et EXAFS de surface

Revue de Métallurgie, 1999
Dans cet article, nous presentons comment utiliser les oscillations du coefficient d’absorption X (EXAFS) pour determiner la structure et l’ordre local autour d’une espece chimique precise dans un materiau. Une description theorique du phenomene est donnee.
P. Le Fèvre, H. Magnan, D. Chandesris
openaire   +1 more source

Unraveling EXAFS spectroscopy

Analytical Chemistry, 1988
The past several years have witnessed the emergence of Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy from an esoteric technique to a widely available structural spectroscopic tool. Several in-depth review articles and books are available on the subject, but some aspects of theory or data reduction may be beyond the scope or need of the ...
Martin J. Fay, Andrew Proctor, Douglas P. Hoffmann, David M. Hercules   +3 more
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Anisotropic EXAFS in GeS

Journal of Physics C: Solid State Physics, 1980
Polarised X-rays of the Deutsches Elektronen-Synchrotron have been used to measure the anisotropic absorption of a GeS single crystal at the Ge K-edge. The orientation-dependent radial structure functions which have been calculated from the extended X-ray absorption fine structure are used to evaluate the three-dimensional arrangement of the atoms in ...
Rabe, P., Tolkiehn, G., Werner, A.
openaire   +2 more sources

An Introduction to Differential EXAFS

AIP Conference Proceedings, 2007
Differential EXAFS (DiffEXAFS) is a novel technique for measuring atomic perturbations on a local scale that result from the modulation of a given sample property. Experiments conducted to date have revealed a sensitivity to such perturbations of the order of femtometres [1], two orders of magnitude more sensitive than is considered possible by ...
RUFFONI M. P, PETTIFER R. F, PASCARELLI S, TRAPANANTI A, MATHON O   +4 more
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EXAFS Studies of Metallothionein

1987
Extended x-ray absorption fine structure (EXAFS) has been used to investigate the metal environment in a number of metallothioneins (MT). In all cases, the primary coordination sphere consists of sulphur atoms. In some cases, evidence for cluster formation is obtained.
S S, Hasnain, G P, Diakun, I, Abrahams, I, Ross, C D, Garner, I, Bremner, M, Vasak   +6 more
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EXAFS: a probe for metalloproteins

Nature, 1990
X-ray absorption spectroscopy provides a method for studying the local environment around a metal atom in a protein.
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EXAFS and LocalThermal Expansion

Physica Scripta, 2005
The sensitivity of X-ray absorption spectroscopy (XAS)to the local structure around a selected atomic species (symmetry,distances and angles)is commonly exploited to quantitatively describe systems where all the configurations around the absorbing atoms may be approximated by the mean on. However,in many cases of disordered systems a simple description
Fornasini, Paolo, A Beccara, Silvio, Dalba, Giuseppe, Grisenti, Rolly, Purans, Juris, Sanson, Andrea, F. Rocca, D. Diop   +7 more
openaire   +6 more sources

The small-atom approximation in EXAFS and surface EXAFS

Journal of Physics C: Solid State Physics, 1988
A simplification of the exact curved-wave theory of extended X-ray absorption fine structure (EXAFS) is presented. This simplified theory is obtained from an approximation to the wavefunction which is based on the physics of the scattering process, and it is found to be in good agreement with the exact theory almost down to the absorption edge.
openaire   +1 more source