scholarly journals X-ray Absorption Spectra of Dissolved Polysulfides in Lithium–Sulfur Batteries from First-Principles

2014 ◽  
Vol 5 (9) ◽  
pp. 1547-1551 ◽  
Author(s):  
Tod A. Pascal ◽  
Kevin H. Wujcik ◽  
Juan Velasco-Velez ◽  
Chenghao Wu ◽  
Alexander A. Teran ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
First Principles ◽  
X Ray ◽  
Lithium Sulfur Batteries ◽  
X Ray Absorption ◽  
Lithium Sulfur

Electronic Structure and X-ray Absorption Spectra of Rutile TiO2 Using First-Principles Calculations

2014 ◽  
Vol 52 (12) ◽  
pp. 1025-1029
Author(s):  
Min-Wook Oh ◽  
Tae-Gu Kang ◽  
Byungki Ryu ◽  
Ji Eun Lee ◽  
Sung-Jae Joo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
First Principles ◽  
First Principles Calculations ◽  
Rutile Tio2 ◽  
X Ray ◽  
X Ray Absorption

X-ray absorption spectra of graphene from first-principles simulations

2010 ◽  
Vol 82 (15) ◽  
Author(s):  
Weijie Hua ◽  
Bin Gao ◽  
Shuhua Li ◽  
Hans Ågren ◽  
Yi Luo
Keyword(s):  
Absorption Spectra ◽  
First Principles ◽  
X Ray ◽  
X Ray Absorption

scholarly journals First-principles modeling of X-ray absorption spectra enlightens the processes of scandium sequestration by iron oxides

2020 ◽  
Vol 105 (7) ◽  
pp. 1099-1103 ◽  
Author(s):  
Mathieu Chassé ◽  
Marc Blanchard ◽  
Delphine Cabaret ◽  
Amélie Juhin ◽  
Delphine Vantelon ◽  
...  
Keyword(s):  
Trace Metals ◽  
Iron Oxides ◽  
Absorption Spectra ◽  
First Principles ◽  
Molecular Mechanisms ◽  
Hydration Shell ◽  
Spectral Features ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

Abstract Scandium is often associated with iron oxides in the environment. Despite the use of scandium as a geochemical tracer and the existence of world-class supergene deposits, uncertainties on speciation obscure the processes governing its sequestration and concentration. Here, we use first-principles approaches to interpret experimental K-edge X-ray absorption near-edge structure spectra of scandium either incorporated in or adsorbed on goethite and hematite, at concentrations relevant for the environment. This modeling helps to interpret the characteristic spectral features, providing key information to determine scandium speciation when associated with iron oxides. We show that scandium is substituted into iron oxides at low concentrations without modifying the crystal structure. When scandium is adsorbed onto iron oxide surfaces, the process occurs through outer-sphere complexation with a reduction in the coordination number of the hydration shell. Considering available X-ray absorption spectra from laterites, the present results confirm that scandium adsorption onto iron oxides is the dominant mechanism of sequestration in these geochemical conditions. This speciation explains efficient scandium recovery through mild metal-lurgical treatments of supergene lateritic ores. The specificities of scandium sorption mechanisms are related to the preservation of adsorbed scandium in million-years old laterites. These results demonstrate the emerging ability to precisely model fine X-ray absorption spectral features of trace metals associated with mineral phases relevant to the environment. It opens new perspectives to accurately determine trace metals speciation from high-resolution spatially resolved X-ray absorption near-edge structure spectroscopy in order to constrain the molecular mechanisms controlling their dynamics.

scholarly journals Exploring reaction dynamics in lithium–sulfur batteries by time-resolved operando sulfur K-edge X-ray absorption spectroscopy

2019 ◽  
Vol 55 (34) ◽  
pp. 4993-4996 ◽  
Author(s):  
Enyue Zhao ◽  
Junyang Wang ◽  
Feng Li ◽  
Zheng Jiang ◽  
Xiao-Qing Yang ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Reaction Dynamics ◽  
Conversion Process ◽  
Time Resolved ◽  
X Ray ◽  
Lithium Sulfur Batteries ◽  
X Ray Absorption ◽  
Sulfur Electrode ◽  
Lithium Sulfur

The multistep kinetic-determining conversion process of a sulfur electrode is directly revealed through time-resolved operando X-ray absorption spectroscopy.

scholarly journals Operando XANES from first-principles and its application to iridium oxide

2020 ◽  
Vol 22 (19) ◽  
pp. 10807-10818 ◽  
Author(s):  
Francesco Nattino ◽  
Nicola Marzari
Keyword(s):  
Density Functional Theory ◽  
Absorption Spectra ◽  
First Principles ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Applied Potential ◽  
Functional Theory ◽  
X Ray ◽  
Continuum Description ◽  
X Ray Absorption

Density-functional theory calculations augmented with a continuum description of the electrochemical environment are implemented to simulated X-ray absorption spectra as a function of the applied potential.

scholarly journals Polysulfide driven degradation in lithium–sulfur batteries during cycling – quantitative and high time-resolution operando X-ray absorption study for dissolved polysulfides probed at both electrode sides

2021 ◽  
Author(s):  
Claudia Zech ◽  
Philipp Hönicke ◽  
Yves Kayser ◽  
Sebastian Risse ◽  
Olga Grätz ◽  
...  
Keyword(s):  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Absorption Study ◽  
X Ray ◽  
Lithium Sulfur Batteries ◽  
X Ray Absorption ◽  
Lithium Sulfur

The quantitative evolution of dissolved polysulfides at both electrode sides of lithium–sulfur batteries is determined with operando X-ray spectrometry.

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