1,721,181 research outputs found
Operando X-ray absorption spectroscopy on battery materials: a review of recent developments
No full textAlthough batteries represent a key tool for sustainable development, their working processes, in terms
of reaction mechanisms, side reactions, ion transport, formation of the solid-electrolyte interface
(SEI), are not yet fully understood. In this respect, operando experiments are of enormous importance
for having hints on the relevant chemical species that form while a battery is working. X-ray
absorption spectroscopy (XAS) has been since a long time a working horse in the investigation of
local structures of materials, and, applied operando, can provide invaluable information on the
working mechanisms of batteries. In this review, after introductory paragraphs concerning the battery
chemistry and the principles of XAS, some of the most important developments in operando XAS
applied to the battery science are considered. Emphasis is given to Li-metal, Na-ion, Li/Sulphur and
all solid state batteries. Related and advanced techniques such as resonant inelastic scattering (RIXS)
and high-resolution fluorescence-detected X-ray absorption spectroscopy (HRFD-XAS) are
discussed as well.
Suggestion are offered for planning a XAS experiment at synchrotron radiation source, and finally,
some considerations concerning the future developments are presented
High-Energy X-ray Absorption Spectroscopy in Materials Chemistry
No full textRecent advances in X-ray Absorption Spectroscopy ((AS) are discussed with a focus on the use of high-energy X-rays and measurements at the K-edges of heavy elements (atomic number >50). The review addresses advantages and drawbacks of measuring at the K-edges, highlights selected examples of XAS in the highenergy range, and outlines appealing future perspectives on instrumentation, data analysis and applications
Correlation between hole density and oxygen excess in the Bi2Sr2CaCu2O8+d superconductor
No full textSusceptibility and evidences of charge carriers interaction above Tc in Nd1.85Ce0.15CuO4
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