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Direct Observation of Hybridization Between Co 3d and S 2p Electronic Orbits: Moderating Sulfur Covalency to Pre-Activate Sulfur-Redox in Lithium-Sulfur Batteries.
Adv Sci (Weinh)
December 2024
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, Heilongjiang, 150025, China.
Lithium-sulfur batteries (LSBs) offer high energy density and environmental benefits hampered by the shuttle effect related to sluggish redox reactions of long-chain lithium polysulfides (LiPSs). However, the fashion modification of the d-band center in separators is still ineffective, wherein the mechanism understanding always relies on theoretical calculations. This study visibly probed the evolution of the Co 3d-band center during charge and discharge using advanced inverse photoemission spectroscopy/ultraviolet photoemission spectroscopy (IPES/UPS), which offers reliable evidence and are consistent well with theoretical calculations.
View Article and Find Full Text PDFRole of Metal-Oxide Interfaces in Methanol Decomposition: Reaction of Methanol on CeO/Ag(111) Inverse Model Catalysts.
J Phys Chem Lett
November 2024
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, People's Republic of China.
Article Synopsis
- Metal-oxide interfaces are important for catalytic processes, especially in methanol reactions on the CeO/Ag(111) catalyst surfaces studied under ultrahigh vacuum (UHV) conditions.
- Scanning tunneling microscopy and other techniques revealed that submonolayer CeO films form a hexagonal lattice with fully oxidized cerium, while higher ceria coverages lead to multilayer formations.
- Methanol interacts with these surfaces to create methoxy groups, which can decompose into formate or formaldehyde, with the submonolayer CeO exhibiting significantly lower temperatures for methoxy dehydrogenation compared to multilayer structures, highlighting the unique catalytic properties of the CeO-Ag(111) interface.
Ferroelectric Semimetals with α-Bi/SnSe van der Waals Heterostructures and Their Topological Currents.
Phys Rev Lett
October 2024
Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Article Synopsis
- * Our research includes calculations on α-Bi/SnSe bilayers, revealing that these structures can exhibit a ferroelectrically switchable nonlinear anomalous Hall effect and significant spin-charge interconversion efficiencies.
- * The high efficiencies arise from the semimetallic behavior of low energy electron states, which can be identified as two-dimensional pseudo-Weyl fermions, supported by both numerical calculations and experimental techniques like angle-resolved photoemission spectroscopy.
Mobility Gaps of Hydrogenated Amorphous Silicon Related to Hydrogen Concentration and Its Influence on Electrical Performance.
Nanomaterials (Basel)
September 2024
Istituto Nazionale di Fisica Nucleare (INFN), Sez. di Perugia, Via Pascoli s.n.c., 06123 Perugia, Italy.
This paper presents a comprehensive study of hydrogenated amorphous silicon (a-Si)-based detectors, utilizing electrical characterization, Raman spectroscopy, photoemission, and inverse photoemission techniques. The unique properties of a-Si have sparked interest in its application for radiation detection in both physics and medicine. Although amorphous silicon (a-Si) is inherently a highly defective material, hydrogenation significantly reduces defect density, enabling its use in radiation detector devices.
View Article and Find Full Text PDFExcited State Band Mapping and Ultrafast Nonequilibrium Dynamics in Topological Dirac Semimetal 1T-ZrTe.
Nano Lett
October 2024
Université de Bordeaux - CNRS - CEA, CELIA, UMR5107, F33405 Talence, France.
Article Synopsis
- Researchers used advanced momentum microscopy to investigate the electronic properties of the topological Dirac semimetal 1T-ZrTe, specifically focusing on the behavior of its Dirac cone above the Fermi level.
- They discovered the role of different scattering processes in how electrons relax, observing important electron-hole interactions and finding that the electrons' lifetime correlates linearly with their excess energy.
- The study offers new insights into the excited state dynamics of 1T-ZrTe, contributing to the understanding of ultrafast electron behaviors in 3D topological materials.
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