Controllable hydrothermal synthesis of manganese dioxide nanostructures: shape evolution, growth mechanism and electrochemical properties

CrystEngComm ◽  
2012 ◽  
Vol 14 (12) ◽  
pp. 4196 ◽  
Author(s):  
Xiaochuan Duan ◽  
Jiaqin Yang ◽  
Haiyan Gao ◽  
Jianmin Ma ◽  
Lifang Jiao ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Electrochemical Properties ◽  
Manganese Dioxide ◽  
Growth Mechanism ◽  
Shape Evolution

Three-Dimensional Precursor-Derived Synthesis of Co3O4 Towards High Electrochemical Performance

2019 ◽  
Vol 11 (10) ◽  
pp. 1375-1386
Author(s):  
Ruili Zhang ◽  
Yuntao Yang ◽  
Ping Yang
Keyword(s):  
Hydrothermal Synthesis ◽  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Growth Mechanism ◽  
Three Dimensional ◽  
Solution Concentration ◽  
Cycling Performance ◽  
Electrochemical Investigation ◽  
Experimental Conditions ◽  
Different Shapes

Three-dimensional (3D) cobalt oxide (Co3O4) flowers with different shapes were prepared by a facile hydrothermal synthesis. The morphology of Co3O4 precursors has adjusted obviously from acicular shapes to acicular-sheet-like flowers and then to sheet-like flowers by changing reaction temperature and solution concentration. After annealing, as-prepared precursors were converted into 3D flower-like Co3O4 samples and their morphology and sizes were well preserved. The effect of experimental conditions on growth of Co3O4 precursors was explored and the growth mechanism was proposed. Moreover, the electrochemical properties of various Co3O4 with different shapes were tested. The result of electrochemical investigation indicates that 3D flower-like Co3O4 assembled by sheets exhibited high capacitance and excellent cycling performance.

α-Fe2O3: Hydrothermal Synthesis, Magnetic and Electrochemical Properties

2010 ◽  
Vol 114 (24) ◽  
pp. 10671-10676 ◽  
Author(s):  
Jianmin Ma ◽  
Jiabiao Lian ◽  
Xiaochuan Duan ◽  
Xiaodi Liu ◽  
Wenjun Zheng
Keyword(s):  
Hydrothermal Synthesis ◽  
Electrochemical Properties

SHAPE EVOLUTION IN ONE-DIMENSIONAL ZnO NANOSTRUCTURES GROWN FROM ZnO NANOPOWDER SOURCE: VAPOR–LIQUID–SOLID VERSUS VAPOR–SOLID GROWTH MECHANISMS

2011 ◽  
Vol 10 (01n02) ◽  
pp. 75-79 ◽  
Author(s):  
SOUMEN DHARA ◽  
P. K. GIRI
Keyword(s):  
Growth Mechanism ◽  
Growth Temperature ◽  
Shape Evolution ◽  
Zno Nanostructures ◽  
Growth Mechanisms ◽  
Vapor Liquid Solid ◽  
One Dimensional ◽  
Zno Nanopowder ◽  
Simultaneous Growth ◽  
Vapor Liquid

Here we report on the growth and evolution of ZnO nanowires grown from ZnO nanopowder as a source material using a horizontal muffle furnace. The shape evolution has been studied with variation in growth temperature and zinc vapor pressure. The structural analysis on these nanostructures shows c-axis oriented aligned growth. Scanning electron microscopy imaging of these nanostructures revealed the shape evolution from nanowires to nanoribbons and then to nanorods as the growth temperature increases from 650°C to 870°C. At 650°C, only vertical nanowires have been observed and with increase in growth temperature nanowires transform to nanoribbons and then to nanorods at 870°C. And we also observed simultaneous growth of nanorods and nanoribbons under a specific growth condition. We believe that these nanowires and nanorods were formed by vapor–liquid–solid growth mechanism (catalyst-mediated growth), whereas nanoribbons were grown by vapor–solid growth mechanism (without the aid of a metal catalyst). We observed simultaneous occurrence of vapor–liquid–solid and vapor–solid growth mechanisms at a particular growth temperature. These ZnO nanowires exhibit bound exciton related UV emission at ~379 nm, and defect-emission band in the visible region. Possible growth mechanism, shape evolution, and simultaneous growth of two types of one-dimensional ZnO nanostructures under the same growth condition are discussed.

Electrochemical properties and bioactivity of hydroxyapatite coatings prepared by MEA/EDTA double-regulated hydrothermal synthesis

2019 ◽  
Vol 298 ◽  
pp. 685-693 ◽  
Author(s):  
Katarzyna Suchanek ◽  
Amanda Bartkowiak ◽  
Marcin Perzanowski ◽  
Marta Marszałek ◽  
Maciej Sowa ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Electrochemical Properties ◽  
Hydroxyapatite Coatings
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