A Comparative First-Principles Study of Lithium, Sodium and Magnesium Insertion Energetics in Brookite Titanium Dioxide

MRS Advances ◽  
2018 ◽  
Vol 4 (14) ◽  
pp. 837-842 ◽  
Author(s):  
Daniel Koch ◽  
Sergei Manzhos

ABSTRACTBrookite titanium dioxide is investigated from first principles as possible insertion-type cathode material for Li, Na and Mg. Recently structural similarity of this phase and amorphous titanium dioxide was reported. Low-concentration insertion energies and the corresponding voltages, however, suggest poor electrochemical performance of brookite in comparison to e.g. layered titania phases such as B-TiO2. We argue that this behavior could be explained by local electronic structure leading to higher voltages in amorphous compounds, since the lattice strains induced by intercalation in brookite are not sufficient to explain the poor binding energies with the investigated metals.

2016 ◽  
Vol 30 (14) ◽  
pp. 1650077 ◽  
Author(s):  
Hajar Nejatipour ◽  
Mehrdad Dadsetani

In a comprehensive study, structural properties, electronic structure and optical response of crystalline o-phenanthroline were investigated. Our results show that in generalized gradient approximation (GGA) approximation, o-phenanthroline is a direct bandgap semiconductor of 2.60 eV. In the framework of many-body approach, by solving the Bethe–Salpeter equation (BSE), dielectric properties of crystalline o-phenanthroline were studied and compared with phenanthrene. Highly anisotropic components of the imaginary part of the macroscopic dielectric function in o-phenanthroline show four main excitonic features in the bandgap region. In comparison to phenanthrene, these excitons occur at lower energies. Due to smaller bond lengths originated from the polarity nature of bonds in presence of nitrogen atoms, denser packing, and therefore, a weaker screening effect, exciton binding energies in o-phenanthroline were found to be larger than those in phenanthrene. Our results showed that in comparison to the independent-particle picture, excitonic effects highly redistribute the oscillator strength.


2015 ◽  
Vol 17 (39) ◽  
pp. 26140-26148 ◽  
Author(s):  
Linn Leppert ◽  
Rhett Kempe ◽  
Stephan Kümmel

We investigate the electronic structure of nickel–palladium systems with first-principles density functional theory (DFT).


2021 ◽  
pp. 2100783
Author(s):  
Hongfei Zheng ◽  
Chenying Zhang ◽  
Yinggan Zhang ◽  
Liang Lin ◽  
Pengfei Liu ◽  
...  

RSC Advances ◽  
2014 ◽  
Vol 4 (97) ◽  
pp. 54769-54774 ◽  
Author(s):  
Jana Radaković ◽  
Katarina Batalović ◽  
Ivan Mađarević ◽  
Jelena Belošević-Čavor

Understanding the microscopic aspect of the hydride formation process provides an insight into the experimentally observed properties of prospective hydrogen storage materials.


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