Structural and Electrochemical Study of Dandelion-Like Manganese Dioxide Synthesized by a New Microwave Hydrothermal Method

2011 ◽  
Vol 233-235 ◽  
pp. 1516-1519
Author(s):  
Jian Ling Li ◽  
Yi Tuo Wang ◽  
Ya Kun Zhang ◽  
Gui Mei Han ◽  
Fei Gao ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Hydrothermal Method ◽  
Electrochemical Impedance ◽  
Active Material ◽  
High Specific Capacitance ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method ◽  
Novel Method ◽  
First Time

The microwave-hydrothermal method for synthesizing g-MnO2 has been investigated for the first time. The dandelion-like g-MnO2 active material with 1.0-5.0 μm in diameter was obtained from KBrO3 and MnSO4 via the novel method. Compared with traditional low-temperature hydrothermal method, this approach lowers the temperature by 30-40 °C, and shorts the reaction time 6-14 h. Electrochemical properties of dandelion-like γ-MnO2were elucidated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy tests. The synthesized material shows a relative high specific capacitance, and the MnO2 obtained at the condition of 75 °C for 2 h shows the best electrochemical properties with a specific capacitance of 239.3 F·g-1 at the current density of 100 mA·g-1 in 6 M KOH electrolyte solution.

A FACILE ONE-STEP HYDROTHERMAL METHOD TO PRODUCE GRAPHENE OXIDE/Fe2O3-NANOTUBES COMPOSITES AND ITS ELECTROCHEMICAL PROPERTIES

NANO ◽  
2012 ◽  
Vol 07 (04) ◽  
pp. 1250032 ◽  
Author(s):  
WEN FU ◽  
CHUNNIAN CHEN
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Hydrothermal Method ◽  
High Specific Capacitance ◽  
Cyclic Voltammogram ◽  
Transmission Electron Microscopy Analysis ◽  
Electron Microscopy Analysis ◽  
One Step ◽  
Charge Discharge

The composites of graphene oxide/ Fe2O3-nanotubes (GO/ Fe2O3-NTs) have been fabricated through a facile one-step hydrothermal method. Fe2O3-NTs crystallines were homogeneously distributed on GO, which have been confirmed by transmission electron microscopy analysis (TEM). The structure, composition and electrochemical properties of GO/ Fe2O3-NTs composites were investigated by means of selective-area electron diffraction (SAED), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectra, cyclic voltammogram (CV) curves and galvanostatic charge–discharge curves. GO/ Fe2O3-NTs composites exhibit a high specific capacitance of 133.2 Fg-1in 1 M Li2SO4electrolyte. In addition, the GO/ Fe2O3-NTs composites electrode shows good long-term cycle stability (only 9% decrease of the specific capacitance is observed after 1000 charge–discharge cycles).

scholarly journals Facile synthesis of NFL-ZnWO4 for pseudocapacitor applications

2019 ◽  
Vol 272 ◽  
pp. 01005
Author(s):  
Xiao Fan ◽  
Xuyuan Chen
Keyword(s):  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Specific Capacitance ◽  
High Property ◽  
Facile Synthesis ◽  
Hydrothermal Route ◽  
Physical And Chemical ◽  
First Time ◽  
Promising Electrode Material

In this report, NFL-ZnWO4 was synthesized by a hydrothermal route and investigated for application in supercapacitors for the first time. The physical and chemical characterizations of the prepared nanomaterial were analyzed by SEM, EDS, XRD and XPS, respectively. Supercapacitors study of CV, GCD and EIS revealed that NFL-ZnWO4 exhibits good electrochemical properties. The high specific capacitance value of 107.7 F g-1 was achieved at 5 mV s−1. These findings demonstrated that ZnWO4 could be a promising electrode material candidate and highly desirable for application of high property supercapacitors in the future.

Electrochemical Properties of Carbon-Coated NbO2 as a Negative Electrode for Lithium-Ion Batteries

2016 ◽  
Vol 724 ◽  
pp. 87-91 ◽  
Author(s):  
Chang Su Kim ◽  
Yong Hoon Cho ◽  
Kyoung Soo Park ◽  
Soon Ki Jeong ◽  
Yang Soo Kim
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Ball Milling ◽  
Carbon Coating ◽  
Electrochemical Impedance ◽  
Active Material ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Transfer Resistance ◽  
Carbon Coated

We investigated the electrochemical properties of carbon-coated niobium dioxide (NbO2) as a negative electrode material for lithium-ion batteries. Carbon-coated NbO2 powders were synthesized by ball-milling using carbon nanotubes as the carbon source. The carbon-coated NbO2 samples were of smaller particle size compared to the pristine NbO2 samples. The carbon layers were coated non-uniformly on the NbO2 surface. The X-ray diffraction patterns confirmed that the inter-layer distances increased after carbon coating by ball-milling. This lead to decreased charge-transfer resistance, confirmed by electrochemical impedance spectroscopy, allowing electrons and lithium-ions to quickly transfer between the active material and electrolyte. Electrochemical performance, including capacity and initial coulombic efficiency, was therefore improved by carbon coating by ball-milling.

DNA-templated microwave-hydrothermal synthesis of nanostructured hydroxyapatite for storing and sustained release of an antibacterial protein

2016 ◽  
Vol 45 (4) ◽  
pp. 1648-1656 ◽  
Author(s):  
Xi Chen ◽  
Bin Yang ◽  
Chao Qi ◽  
Tuan-Wei Sun ◽  
Feng Chen ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Sustained Release ◽  
Hydrothermal Method ◽  
Nanostructured Materials ◽  
Antibacterial Study ◽  
Antibacterial Protein ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method

Hydroxyapatite nanostructured materials are prepared by a DNA-templated microwave-hydrothermal method and used for IgY loading/release and antibacterial study.

Microwave-hydrothermal method post-treatment of sprayed Ca-P coating

2019 ◽  
Vol 45 (1) ◽  
pp. 874-884 ◽  
Author(s):  
Yangyang Su ◽  
Kezhi Li ◽  
Xiaofei Zhu ◽  
Changcong Wang ◽  
Yunpeng Zhang
Keyword(s):  
Hydrothermal Method ◽  
Post Treatment ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method

scholarly journals Photoluminescence and Chromaticity Properties of ZnO Nanopowders Made by a Microwave Hydrothermal Method

2011 ◽  
Vol 120 (5) ◽  
pp. 908-910 ◽  
Author(s):  
E. Wolska ◽  
D. Sibera ◽  
B.S. Witkowski ◽  
S.A. Yatsunenko ◽  
I. Pełech ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method
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