176 research outputs found
XUV spectroscopy and time resolved dynamics
No full textEUSPEC WG3 COST meeting on " XUV spectroscopy and time resolved dynamics", 14-15 April Elettra Sincrotrone Trieste
XTRAM - XUV Time Resolved Advanced Methods
No full textXTRAM is the first edition of EUSPEC workshop and school with a strong focus on highly advanced spectroscopies and their direct comprehension by the most developed theoretical computational and ab-initio means. An average of 40– 60 attendees and a duration of 4 days taking place in Erice at the Ettore Majorana Foundation
APPLICATION OF A COMPLEX POTENTIAL TO THE INTERPRETATION OF XANES SPECTRA - THE CASE OF NA K-EDGE IN NACL
No full textMagnetic Ions in Group IV Semiconductors
No full textXAS experiments at the TM K-edge in semiconductors, will be employed
as a crucial technique to spread light not only on the mechanisms of the atomic substi-
tion, but also to investigate how the semiconductor surrounding the metal is perturbed
by the insertion of an extrinsic atomic species. Wherever nominal dilution of Mn is
obtained, such investigations put in light the physical constraints that must be con-
sidered to describe the electronic problem of the ferromagnetism on-set. Contrarily
to the case of the III-V group doped semiconductors the research field is still incom-
plete and many systems have not been dealt with yet in any details, possibly because
of more difficult realization and of a more controversial interpretation
CHEMICAL-SHIFT LOW-ENERGY PHOTOELECTRON DIFFRACTION - A DETERMINATION OF THE INP(110) CLEAN SURFACE STRUCTURAL RELAXATION
No full text
Low Kinetic energy AED: a tool for the study of Geepitaxial layers grown on Sb-terminated Si(111) surface
No full textSiC formation by reaction of Si(100) with acetylene; electronic structure and growth mode
No full textInvestigation of interfacial properties of carbon coated ZnFe2O4 as new anode material for Li-ion batteries
No full textIn recent years, the growing need for high specific energy density and good cycling performance has prompted the research to develop novel electrode materials for Li-ion batteries. In this context, carbon coated ZnFe2O4 (C-ZFO) has attracted increasing interest as promising new anode material because it offers an exceptional specific capacity, higher than 1000 mAh g-1, and it is environmentally friendly, non toxic and cheap.1
This electrode material has been used in SIRBATT project in order to investigate the evolution of Solid Electrolyte Interphase (SEI) in this anode because the performances and durability of batteries are strongly influenced by the passivation layer formed on electrode surface.2
The electrodes have been prepared by casting the slurry containing active material, conductive carbon and carboxymethyl cellulose as binder. The electrochemical performances and the study of electrode/electrolyte interface have been investigated by galvanostatic cycles at different C-rate values, Electrochemical Impedance Spectroscopy (EIS) at 25 °C and 50°C and soft X-ray adsorption spectroscopy (XAS) using synchrotron radiation.
The electrochemical results have shown that C-ZFO has good cycling performance, with high capacity values also at highest rates, and high stability upon cycling. Furthermore, EIS measurements have reveal that the electrode interfacial stability is more compromised at high temperatures.
The XAS results have allowed to obtain important information on SEI formation and evolution upon C-ZFO electrodes.
References:
1) Deng Y., Zhang Q.,Tang S., Zhang L., Deng S., Shi Z., Chen G., Chemical Communications., 2011, 47, 6828–6830
2) Di Cicco A., Giglia A., Gunnella R., Koch S. L, Mueller, F., Nobili F., Pasqualini M., Passerini S., Tossici R., Witkowska A., Advanced Energy Materials, 2015, 5, 150064
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