Based on a specific zinc storage mechanism and excellent electronic conductivity, transition metal dichalcogenides, represented by vanadium diselenide, are widely used in aqueous zinc-ion battery (AZIB) energy storage systems. However, most vanadium diselenide cathode materials are presently limited by low specific capacity and poor cycling life. Herein, a simple hydrothermal process has been proposed for obtaining a vanadium diselenide cathode for an AZIB. The interaction of defects and crystal planes enhances zinc storage capacity and reduces the migration energy barrier. Moreover, abundant lamellar structure greatly increases reaction sites and alleviates volume expansion during the electrochemical process. Thus, the as-obtained vanadium diselenide AZIB exhibits an excellent reversible specific capacity of 377 mAh g at 1 A g, and ultralong cycle stability of 291 mAh g after 3200 cycles, with a nearly negligible capacity loss. This one-stone-for-two-birds strategy would be expected to be applied to large-scale synthesis of a high-performance zinc-ion battery cathode in the future.
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http://dx.doi.org/10.1021/acsami.4c02177 | DOI Listing |
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December 2024
Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30123-970, Brazil.
2D dilute magnetic semiconductors (DMS) based on transition metal dichalcogenides (TMD) offer an innovative pathway for advancing spintronic technologies, including the potential to exploit phenomena such as the valley Zeeman effect. However, the impact of magnetic ordering on the valley degeneracy breaking and on the enhancement of the optical transitions g-factors of these materials remains an open question. Here, a giant effective g-factors ranging between ≈-27 and -69 for the bound exciton at 4 K in vanadium-doped WSe monolayers, obtained through magneto-photoluminescence (PL) experiments is reported.
View Article and Find Full Text PDFACS Appl Mater Interfaces
October 2024
Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77840, United States.
Two-dimensional (2D) transition-metal dichalcogenides (TMDCs), such as tungsten diselenide (WSe), hold immense potential for applications in electronic and optoelectronic devices. However, a significant Schottky barrier height (SBH) at the metal-semiconductor (MS) interface reduces the electronic device performance. Here, we present a unique 2D/2D contact method for minimizing contact resistance and reducing the SBH.
View Article and Find Full Text PDFLuminescence
September 2024
Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, India.
Layered transition metal dichalcogenides (TMDs), with an extensive surface area, intriguing tunable electrical and optical features, and a distinctive Van der Waals layered structure, yield outstanding sensing properties. Essentially, most TMDs originally existed in the crystallographic phase of a 2H trigonal prismatic structure, which is semiconducting in nature with poor electrocatalytic activity. In contrast, vanadium diselenide (VSe) with its metastable metallic 1 T octahedral crystal structure has been proven to be an outstanding electrode material, embracing exceptional electrocatalytic behavior for various electrochemical (EC) applications.
View Article and Find Full Text PDFMikrochim Acta
August 2024
Centre for Nano and Material Sciences, Jain (Deemed-to-Be University), Jain Global Campus, Kanakapura Road, Bangalore, 562112, Karnataka, India.
ACS Nano
August 2024
Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France.
There has been extensive activity exploring the doping of semiconducting two-dimensional (2D) transition metal dichalcogenides in order to tune their electronic and magnetic properties. The outcome of doping depends on various factors, including the intrinsic properties of the host material, the nature of the dopants used, their spatial distribution, as well as their interactions with other types of defects. A thorough atomic-level analysis is essential to fully understand these mechanisms.
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