Theoretical Exploration of Quaternary Hexagonal MAB Phases and Two-Dimensional Derivatives

Nanoscale ◽  
2021 ◽  
Author(s):  
Yufang Yao ◽  
Nanxi Miao ◽  
Yutong Gong ◽  
Junjie Wang
Keyword(s):  
Transition Metals ◽  
Great Promise ◽  
Two Dimensional

The newly discovered hexagonal MAB (h-MAB) phases have shown great promise in synthesizing 2-D borides, but a wide application is hindered by the limited kinds of transition metals that can...

scholarly journals Catalysis Mediated by 2D Black Phosphorus Either Pristine or Decorated with Transition Metals Species

Surfaces ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 132-167
Author(s):  
Matteo Vanni ◽  
Maria Caporali ◽  
Manuel Serrano-Ruiz ◽  
Maurizio Peruzzini
Keyword(s):  
Catalytic Activity ◽  
Transition Metals ◽  
Visible Light Irradiation ◽  
2D Materials ◽  
Chemical Processes ◽  
Great Promise ◽  
The Novel ◽  
Two Dimensional ◽  
Basic Character ◽  
Selection Of

Among the novel class of mono-elemental two-dimensional (2D) materials, termed Xenes, phosphorene is emerging as a great promise for its peculiar chemical and physical properties. This review collects a selection of the recent breakthroughs that are related to the application of phosphorene in catalysis and electrocatalysis. Noteworthy, thanks to its intrinsic Lewis basic character, pristine phosphorene turned out to be more efficient and more selective than other non-metal catalysts, in chemical processes as the electroreduction of nitrogen to ammonia or the alkylation of nucleophiles with esters. Once functionalized with transition metals nanoparticles (Co, Ni, Pd, Pt, Ag, Au), its catalytic activity has been evaluated in several processes, mainly hydrogen and oxygen evolution reactions. Under visible light irradiation, it has shown a great improvement of the activity, demonstrating high potential as a photocatalyst.

Electronic properties of quasi two-dimensional transition metals chalcogenides with low-dimensional magnetism

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 87-95
Author(s):  
M. S. Baranava ◽  
P. A. Praskurava
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Exchange Interaction ◽  
Electronic Properties ◽  
Metal Atom ◽  
Transition Metal Atom ◽  
Two Dimensional ◽  
Transition Metal Atoms ◽  
Ground Magnetic ◽  
Low Dimensional

The search for fundamental physical laws which lead to stable high-temperature ferromagnetism is an urgent task. In addition to the already synthesized two-dimensional materials, there remains a wide list of possible structures, the stability of which is predicted theoretically. The article suggests the results of studying the electronic properties of MAX3 (M = Cr, Fe, A = Ge, Si, X = S, Se, Te) transition metals based compounds with nanostructured magnetism. The research was carried out using quantum mechanical simulation in specialized VASP software and calculations within the Heisenberg model. The ground magnetic states of twodimensional MAX3 and the corresponding energy band structures are determined. We found that among the systems under study, CrGeTe3 is a semiconductor nanosized ferromagnet. In addition, one is a semiconductor with a bandgap of 0.35 eV. Other materials are antiferromagnetic. The magnetic moment in MAX3 is localized on the transition metal atoms: in particular, the main one on the d-orbital of the transition metal atom (and only a small part on the p-orbital of the chalcogen). For CrGeTe3, the exchange interaction integral is calculated. The mechanisms of the formation of magnetic order was established. According to the obtained exchange interaction integrals, a strong ferromagnetic order is formed in the semiconductor plane. The distribution of the projection density of electronic states indicates hybridization between the d-orbital of the transition metal atom and the p-orbital of the chalcogen. The study revealed that the exchange interaction by the mechanism of superexchange is more probabilistic.

Lamellar Porous Vermiculite Membranes for Boosting Nanofluidic Osmotic Energy Conversion

2021 ◽  
Author(s):  
Li Cao ◽  
Hong Wu ◽  
Chunyang Fan ◽  
Zhiming Zhang ◽  
Benbing Shi ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Power Density ◽  
Great Promise ◽  
Two Dimensional ◽  
Nanofluidic Channels ◽  
Salinity Gradients ◽  
Transmembrane Resistance

Lamellar membranes with two-dimensional nanofluidic channels hold great promise in harvesting osmotic energy from salinity gradients. However, the power density is often limited by the high transmembrane resistance primarily caused...

Fe3O4 Nanoplates Anchored on the Ti3C2Tx MXene with Enhanced Pseudocapacitive and Electrocatalytic Properties

Nanoscale ◽  
2021 ◽  
Author(s):  
Lu Zhang ◽  
Zhuo Wang ◽  
Wenxiao Chen ◽  
Ruiwen Yuan ◽  
Ke Zhan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electrochemical Performance ◽  
Electrochemical Energy Storage ◽  
Great Promise ◽  
Two Dimensional ◽  
Electrocatalytic Properties ◽  
Electrochemical Energy

Ti3C2Tx as a novel member of the two-dimensional material family holds great promise for electrochemical energy storage and catalysis, however, the electrochemical performance of Ti3C2Tx is largely limited by the...

Computational studies on triphenyldiyne as a two-dimensional visible-light-driven photocatalyst for overall water splitting

2020 ◽  
Vol 22 (35) ◽  
pp. 20061-20068
Author(s):  
Siyun Qi ◽  
Yingcai Fan ◽  
Weifeng Li ◽  
Mingwen Zhao
Keyword(s):  
Electronic Structures ◽  
Carrier Mobility ◽  
Carbon Materials ◽  
Great Promise ◽  
Two Dimensional ◽  
Energy Conversion And Storage ◽  
Visible Light Driven ◽  
High Carrier Mobility ◽  
High Carrier ◽  
And Storage

The high carrier mobility, porous configurations and tunable electronic structures of two-dimensional (2D) carbon materials hold great promise in energy conversion and storage.

scholarly journals Giant enhancement of exciton diffusivity in two-dimensional semiconductors

2020 ◽  
Vol 6 (51) ◽  
pp. eabb4823
Author(s):  
Yiling Yu ◽  
Yifei Yu ◽  
Guoqing Li ◽  
Alexander A. Puretzky ◽  
David B. Geohegan ◽  
...  
Keyword(s):  
Threshold Value ◽  
Great Promise ◽  
Two Dimensional ◽  
Incident Power ◽  
Many Body ◽  
Device Development ◽  
Exciton Transport ◽  
2D Semiconductors ◽  
Many Body Interactions ◽  
Exciton Scattering

Two-dimensional (2D) semiconductors bear great promise for application in optoelectronic devices, but the low diffusivity of excitons stands as a notable challenge for device development. Here, we demonstrate that the diffusivity of excitons in monolayer MoS2 can be improved from 1.5 ± 0.5 to 22.5 ± 2.5 square centimeters per second with the presence of trapped charges. This is manifested by a spatial expansion of photoluminescence when the incident power reaches a threshold value to enable the onset of exciton Mott transition. The trapped charges are estimated to be in a scale of 1010 per square centimeter and do not affect the emission features and recombination dynamics of the excitons. The result indicates that trapped charges provide an attractive strategy to screen exciton scattering with phonons and impurities/defects. Pointing towards a new pathway to control exciton transport and many-body interactions in 2D semiconductors.

Inter-overlapped MoS2/C composites with large-interlayer-spacing for high-performance sodium-ion batteries

2020 ◽  
Vol 5 (7) ◽  
pp. 1127-1135 ◽  
Author(s):  
Yinghui Wang ◽  
Ya Yang ◽  
Deyang Zhang ◽  
Yangbo Wang ◽  
Xiaoke Luo ◽  
...  
Keyword(s):  
Molybdenum Disulfide ◽  
High Performance ◽  
Interlayer Spacing ◽  
Layered Material ◽  
Sodium Ion ◽  
Great Promise ◽  
Sodium Ion Batteries ◽  
Two Dimensional

As a two-dimensional layered material with a structure analogous to that of graphene, molybdenum disulfide (MoS2) holds great promise in sodium-ion batteries (SIBs).

A new two-dimensional metal–organic framework with high spin-filtering efficiency

2015 ◽  
Vol 17 (26) ◽  
pp. 17437-17444 ◽  
Author(s):  
Bikash Mandal ◽  
Pranab Sarkar
Keyword(s):  
Transition Metals ◽  
High Spin ◽  
Metal Organic Framework ◽  
Two Dimensional ◽  
Filtering Efficiency ◽  
Metal Organic ◽  
Spin Filtering ◽  
Organic Framework

A new metal–organic framework, consisting of substituted naphthalene molecules and transition metals, is proposed with good spin filtering properties.

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