metal atoms
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Author(s):  
Rinky Sha ◽  
Palash Chandra Maity ◽  
Umamaheswari Rajaji ◽  
Ting-Yu Liu ◽  
Tarun Kanti Bhattacharyya

Abstract Molybdenum diselenide (MoSe2), an in-organic analog of graphene, is considered a rising star in the family of transition-metal dichalcogenides (TMDs) because of its stable covalent Mo–Se bond, good catalytic properties, huge specific surface area, higher electrical, multivalent oxidation states of transition metal ions, and its ability to be intercalated with suitably-sized metal atoms or organic molecules to modify their physical properties with a distinguishing layered structure. It is being projected as the next-generation 2D layered nano-material for many energy storage-conversion applications. This review covers the properties, functionalization of MoSe2, and their applications in supercapacitors, discussing the current developments of MoSe2 and its nano-composites-based supercapacitors, providing emphasis to the capacitive performances which comprise of specific capacitance/ capacity, cyclic lifespan, energy density, power density, rate capability, and their practicality in the real environments. Fundamental charge-storage mechanisms are also discussed to provide better insight into how MoSe2 is ascribed to each supercapacitor. Wherever applicable, limitations of the existing approaches and future outlook are also described.


Author(s):  
С.А. Шарко ◽  
А.И. Серокурова ◽  
Н.Н. Новицкий ◽  
А.И. Стогний ◽  
В.А. Кецко

Gold films with a thickness of several tens of nanometers were obtained on silicon and quartz substrates by ion-beam deposition – sputtering. It is shown that the predominant lateral growth of nanoscale metal layers along the substrate surface occurs under exposure to the high-energy component of the sputtered atoms flux. The decisive role in the nanometer gold film for-mation is played by the elastic collision of sputtered metal atoms with atoms of the substrate and the growing film. The application of the manifold deposition – sputtering operation allows sup-pressing the grain formation process and obtaining gold films with better characteristics than those with a single deposition.


2022 ◽  
Vol 64 (2) ◽  
pp. 261
Author(s):  
O.V. Sidorova ◽  
L.A. Aleshina ◽  
A.D. Fofanov

The structure of amorphous-crystalline titanite obtained by mechanical activation was studied by X-ray diffraction and simulation methods. The short-range order characteristics were calculated using Finbak-Warren's method. It was found that the coordination numbers of metal atoms decreased as the result of titanite grinding. The atomic configurations of short-range order of ground titanite were constructed by translation of titanite unit cell. The theoretical X-ray patterns were calculated using Debye's method and were compared with the experimental curves. The structure of ground titanite in the mill with centrifugal factor 40 g was described satisfactorily by the model of mechanical mixture of clusters containing 2016 atoms, disordered during the molecular dynamics with clusters containing 12096 atoms. The increase of grinding intensity led to the sharp decrease of sizes of small cluster.


Author(s):  
Zheng-Zhe Lin ◽  
Xi-Mei Li ◽  
Xin-Wei Chen ◽  
Xi Chen

As promising catalytic systems, single-atom catalysts (SACs) demonstrate improved catalytic performance for electrochemical reactions. However, the pinning of metal atoms on surfaces usually depends on the adsorption on defects. In...


Author(s):  
Alma L. Marcos-Viquez ◽  
A. Miranda ◽  
Miguel Cruz-Irisson ◽  
Luis A. Pérez

Author(s):  
Hao Hu ◽  
Jiale Wang ◽  
Peng Tao ◽  
Chengyi Song ◽  
Wen Shang ◽  
...  

Single-atom catalysts (SACs) have attracted significant attention in recent years for their maximum atomic utilization and high efficiency in a series of electrocatalytic reactions. However, the atomic-dispersed metal atoms have...


2022 ◽  
Author(s):  
Jorge Barroso ◽  
Sudip Pan ◽  
Gabriel Merino

Would it be possible to eventually derive a simple methodology to predict the structure adopted by boron clusters based on its structural transformation induced by the doping with one or two metal atoms?


Nanoscale ◽  
2022 ◽  
Author(s):  
Xinzhang Lin ◽  
Junying Zhang ◽  
Jie Tang ◽  
Yang Yang ◽  
Chao Liu ◽  
...  

As the bridge between single metal atoms and metal nanoclusters, atomically precise metal complexes are of great significance for the controlled synthesis and catalytic applications at the atomic level. Herein,...


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