Controlled growth of MoS2 nanopetals and their hydrogen evolution performance

RSC Advances ◽  
2016 ◽  
Vol 6 (22) ◽  
pp. 18483-18489 ◽  
Author(s):  
Lin Ling ◽  
Chan Wang ◽  
Kai Zhang ◽  
Taotao Li ◽  
Lei Tang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Growth Mechanism ◽  
Spiral Growth ◽  
Controlled Growth ◽  
Vertical Growth

From horizontal to vertical growth, dense edge-oriented MoS2 nanopetals have been synthesized via an APCVD method through the spiral growth mechanism.

scholarly journals Front Cover: Investigation on the Growth Mechanism of Cu 2 MoS 4 Nanotube, Nanoplate and its use as a Catalyst for Hydrogen Evolution in Water (Chem. Asian J. 12/2020)

2020 ◽  
Vol 15 (12) ◽  
pp. 1758-1758
Author(s):  
Ly T. Le ◽  
Thao T. T. Nguyen ◽  
Trang T. T. Nguyen ◽  
Mai T. T. Nguyen ◽  
Thuy T. D. Ung ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Growth Mechanism ◽  
Front Cover

Experimental and theoretical studies of the mica polymorphs

1956 ◽  
Vol 31 (234) ◽  
pp. 209-235 ◽  
Author(s):  
J. V. Smith ◽  
H. S. Yoder
Keyword(s):  
Growth Mechanism ◽  
Theoretical Study ◽  
Dominant Role ◽  
Spiral Growth ◽  
Theoretical Studies ◽  
X Ray ◽  
Layer Cell ◽  
Triclinic Structure ◽  
Experimental And Theoretical Studies ◽  
Made In

SummaryAn experimental and theoretical study has been made in order to determine the number and the structure of the possible polymorphs and to determine the structural relations between them. The simplest structures are 1M, 2M1, 2M2, 3T, 20, and 6H polymorphs, and more complicated types can be developed. Some of the previously described polymorphs were not contained in the theoretical list and were re-examined. The 6M structure was found to be a 2M2 polymorph, the 6-layer triclinic type was found to be a 2M1 polymorph, and the 3M structure was shown to be a 3T type. The 24-layer triclinic structure could be described on a simpler 8-layer cell. This type together with a new 12-layer monoclinic structure, as well as other structures of higher periodicity, presumably consists of complex stacking and results from spiral-growth mechanism. Two extreme types of layer-disordered crystals may be built and a disorder of individual ions may also occur. Single stacking faults result in twinned crystals. A new twin relation (180° rotation about the [100] axis) has been recognized. Twenty specimens from extreme geological environments have been examined in order to evaluate the control of environment on the stacking. The type of stacking could not be attributed solely to the influence of pressure and temperature. Composition appears to play a dominant role in the type of stacking, and semi-quantitative structural arguments appear to support this contention. The influence of growth mechanism is discussed. A scheme for the identification of the mica polymorphs by X-ray powder and single-crystal methods is given.

Controlled Growth of Edge‐Enriched ReS 2 Nanoflowers on Carbon Cloth Using Chemical Vapor Deposition for Hydrogen Evolution

2020 ◽  
Vol 7 (22) ◽  
pp. 2001196
Author(s):  
Yajuan Zhao ◽  
Jianguo Li ◽  
Jianfeng Huang ◽  
Liangliang Feng ◽  
Liyun Cao ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Hydrogen Evolution ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Carbon Cloth ◽  
Controlled Growth

Graphite Morphology Control in Cast Iron

1984 ◽  
Vol 34 ◽  
Author(s):  
S. V. Subramanian ◽  
D. A. R. Kay ◽  
G. R. Purdy
Keyword(s):  
Cast Iron ◽  
Growth Mechanism ◽  
Driving Forces ◽  
Morphology Control ◽  
Spiral Growth ◽  
Compacted Graphite ◽  
Spherulitic Morphology ◽  
Graphite Morphology ◽  
Control Diagram ◽  
Graphite Growth

ABSTRACTGraphite morphology in cast iron is analyzed in terms of the growth kinetics of graphite crystals in liquid iron. At small driving forces, i.e., low supersaturation or small kinetic undercooling, graphite growth is characterized by faceted growth, resulting in flake, compacted and spherulitic graphite morphologies. However, at large driving forces, there is a transition from facted to non-faceted growth, resulting in a dendritic growth morphology.Flake morphology is rationalized in terms of impurity dependent crystal growth mechanisms, whereas a spherulitic morphology is attributed to a defect controlled spiral growth mechanism. Compacted graphite morphology is considered as a transition between flake and spherulitic morphology.A thermodynamic approach is used to inter-relate the residual concentrations of impurities of technological interest, i.e. S and 0, as a function of the residual concentration of the reactive elements, Mg, Ca, and Ce in a typical cast iron melt at 1500'C and atmospheric pressure. Such a diagram that quantitatively relates graphite morphology in thick cast iron sections to soluble concentrations of impurities is referred to as a graphite morphology control diagram.In thin section castings that freeze at faster cooling rates and large kinetic undercoolings, the basal spiral growth mechanism dominates over the impurity controlled prism growth mechanism, leading to deviations from predictions based simply on the graphite morphology control diagram. In the ase of compacted graphite, where growth on both the prism and basal faces is involved, the degree of nodularity increases with the cooling rate, giving rise to section sensitivity.At large undercoolings, the prevention of the nucleation and growth of cementite is an essential feature of graphite morphology control. It is estimated that the mobility of the cementite interface exceeds that of the prism interface in flake graphite growth by an order of magnitude and that of the basal interface in spherulitic graphite growth by three orders of magnitude. In practice, the driving force for graphite growth is raised selectively through the addition of graphite stabilizing elements, such as silicon, which raise the temperature of the graphite eutectic and depress the temperature of the carbide eutectic. Kinetic growth undercooling can be decreased by increasing the number of heterogeneous nuclei for graphite growth through inoculation. The application of the above concepts for the control of graphite morphology in shaped automotive castings is discussed.

Controlled growth of vertical 3D MoS2(1−x)Se2x nanosheets for an efficient and stable hydrogen evolution reaction

2016 ◽  
Vol 4 (46) ◽  
pp. 18060-18066 ◽  
Author(s):  
Xiaoshuang Chen ◽  
Zhiguo Wang ◽  
Yunfeng Qiu ◽  
Jia Zhang ◽  
Guangbo Liu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Controlled Growth

Vertically oriented and component-controllable 3D MoS2(1−x)Se2x nanosheets were grown via a CVD technique. Mo(S0.53Se0.47)2 alloy nanosheets exhibited the best HER performance.

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