Zobrazeno 1 - 10
of 141
pro vyhledávání: '"Volkert, Cynthia A."'
Manganese dissolution during the oxygen evolution reaction (OER) has been a persistent challenge that impedes the practical implementation of Mn-based electrocatalysts including the LiMn$_x$O$_4$ system in aqueous alkaline electrolyte. The investigat
Externí odkaz:
http://arxiv.org/abs/2309.00101
Autor:
Weber, Niklas A., Lee, Miru, Schönewald, Florian, Schüler, Leonard, Moshnyaga, Vasily, Krüger, Matthias, Volkert, Cynthia A.
We conducted lateral force microscopy measurements on seven [LaMnO$_{3}$]$_{m}$/[SrMnO$_{3}$]$_{n}$ superlattices with varied layer thicknesses. We observe that the friction forces and the friction coefficients initially increase with increasing LaMn
Externí odkaz:
http://arxiv.org/abs/2210.09677
Publikováno v:
Europhysics Letters 142 46001 (2023)
We theoretically study the frictional damping of a small probe object on a coated planar surface, analyzing the resulting phonon modes via a theory of viscoelasticity. Three different types of excitations are found to contribute to friction in distin
Externí odkaz:
http://arxiv.org/abs/2205.01151
While obtaining theoretical predictions for dissipation during sliding motion is a difficult task, one regime that allows for analytical results is the so-called noncontact regime, where a probe is weakly interacting with the surface over which it mo
Externí odkaz:
http://arxiv.org/abs/2108.03025
Autor:
Weber, Niklas A., Schmidt, Hendrik, Sievert, Tim, Jooss, Christian, Güthoff, Friedrich, Moshneaga, Vasily, Samwer, Konrad, Krüger, Matthias, Volkert, Cynthia A.
Despite the huge importance of friction in regulating movement in all natural and technological processes, the mechanisms underlying dissipation at a sliding contact are still a matter of debate. Attempts to explain the dependence of measured frictio
Externí odkaz:
http://arxiv.org/abs/2009.12137
Autor:
Schönewald, Florian, Eckhoff, Marco, Baumung, Max, Risch, Marcel, Blöchl, Peter E., Behler, Jörg, Volkert, Cynthia A.
We investigate the effect of the surface electronic structure and composition of LiMn$_2$O$_4$ nanoparticles on the electrocatalytic oxygen evolution reaction (OER). Scanning transmission electron microscopy (STEM) electron energy loss spectroscopy (
Externí odkaz:
http://arxiv.org/abs/2007.04217
Autor:
Eckhoff, Marco, Schönewald, Florian, Risch, Marcel, Volkert, Cynthia A., Blöchl, Peter E., Behler, Jörg
Publikováno v:
Phys. Rev. B 102, 174102 (2020)
Many positive electrode materials in lithium ion batteries include transition metals which are difficult to describe by electronic structure methods like density functional theory (DFT) due to the presence of multiple oxidation states. A prominent ex
Externí odkaz:
http://arxiv.org/abs/2007.00327
Spinel lithium manganese oxide (LixMn2O4) is used as an active material in battery cathodes. It is a relatively inexpensive and environmentally friendly material, but suffers from capacity fade during use. The capacity losses are generally attributed
Externí odkaz:
http://arxiv.org/abs/2002.04843
Publikováno v:
In Journal of Materials Science & Technology 20 June 2023 149:247-254
Publikováno v:
In Materials Science & Engineering A 3 March 2023 867