Excellent Rate Capability in H2SO4 of a Porous Carbon Prepared by Template Method Using a Mazzite Mineral as Template

2011 ◽  
Vol 230-232 ◽  
pp. 1173-1176
Author(s):  
Gui Yang Liu ◽  
Yan Nan Li ◽  
Jun Ming Guo ◽  
Bao Sen Wang
Keyword(s):  
Cyclic Voltammetry ◽  
Phase Composition ◽  
Electrochemical Performance ◽  
Porous Carbon ◽  
Rate Capability ◽  
Template Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Morphology ◽  
Scan Rate

A porous carbon was prepared by template method using a mazzite mineral as a template. X-ray diffraction (XRD), nitrogen adsoption, scanning electric microscope (SEM) and cyclic voltammetry (CV) were used to investigate the phase composition, pore structure, morphology and electrochemical performance of the carbon. The surface area of the carbon is 511m2/g. The pores of the carbon are mcropores and mesopores. In H2SO4 medium, the carbon exhibits a low capacity and a rectangle-like shaped CV curve at low scan rate. When the scan rate increases from 10 to 200mV/s, the capacity decreases only from 47 to 41F/g, and the rectangle-like shape keeps well. The carbon exhibits an excellent rate capability.

A Porous Carbon Prepared by Using a Mordenite Mineral as Template and its Cyclic Voltammetry Study in H2SO4

2010 ◽  
Vol 143-144 ◽  
pp. 749-752
Author(s):  
Gui Yang Liu ◽  
Yan Nan Li ◽  
Jun Ming Guo ◽  
Bao Sen Wang
Keyword(s):  
Cyclic Voltammetry ◽  
Phase Composition ◽  
Rate Capability ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scan Rate ◽  
Micro Morphology ◽  
Good Rate Capability ◽  
Templated Carbon

A natural mordenite mineral has been used as a template to prepare a templated carbon. X-ray diffraction (XRD), nitrogen adsorption, scanning electric microscope (SEM) and cyclic voltammetry (CV) are used to analyze the phase composition, pore structure, micro morphology and electrochemical performance. The specific surface area of the templated carbon is 724m2/g, and the mesoporosity is high to 63.8%. In H2SO4 medium, the carbon has large capacity and good rate capability. The capacity of the carbon decreases from 103 to 94F/g (the capacity remains more than 92%) when the scan rate increases from 10 to 200mV/s. The CV curve of the templated carbon exhibits rectangle-like shape, and the shape keeps well at high scan rate.

Hydrothermal Synthesis and Electrochemical Performance of WO3 Nanoparticles

2013 ◽  
Vol 750-752 ◽  
pp. 217-220
Author(s):  
Li Jin Feng ◽  
Rong Ma ◽  
Xiu Hua Li ◽  
Xu Chun Song
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Hydrothermal Synthesis ◽  
Electrochemical Performance ◽  
Electrochemical Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Intercalation ◽  
Transmission Electron

In the present paper, the WO3 nanoparticles were fabricated via a hydrothermal treatment. The products are characterized in detail by multiform techniques: transmission electron microscopy, X-ray diffraction. The results show that products are WO3 nanoparticles with diameter of about 100-150 nm. Electrochemistry properties of the prepared WO3 nanoparticles was characterized by cyclic voltammetry. Cyclic voltammetry results indicate that WO3 nanoparticles exhibits a remarkable electrochemical activity for hydrogen intercalation. The reason for electrochemical activity of WO3 nanoparticles is attributed to the formation of HxWO3 by hydrogen intercalation/de-intercalation into/out of the tungsten oxide.

Electrochemical performance of M3(BTC)2·12H2O (M=Co, Ni, and Zn) for Supercapacitors

2011 ◽  
Vol 15 (2) ◽  
pp. 79-82
Author(s):  
Chenmin Liao ◽  
Jiachang Zhao ◽  
Bohejin Tang ◽  
Aomin Tang ◽  
Yanhong Sun ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scan Rate ◽  
Metal Organic ◽  
Acetate Hydrate ◽  
Xrd Patterns ◽  
Maximum Specific Capacitance

A series of Metal-Organic Frameworks (MOFs) based on 1,3,5-benzenetricarboxylic (BTC) acid and M(II) acetate hydrate (M=Co, Ni, and Zn) were successfully synthesized and named as M3(BTC)2·12H2O. These compounds were examined by X-ray diffraction (XRD) patterns. Electrochemical properties of the materials were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 6 M KOH aqueous solutions. The maximum specific capacitance of Ni3(BTC)2·12H2O is found to be 429 F g-1 at 5 mV s-1 and 154 F g-1 at 200 mV s-1 scan rate.

Ni-MnO2 Synthesized by One-Step Liquid Phase Coprecipitation as Promising Electrode Materials for Supercapacitor

2020 ◽  
Vol 999 ◽  
pp. 21-27 ◽  
Author(s):  
Yue Zhou ◽  
Qing Hao Yang ◽  
Jie Dong
Keyword(s):  
Cyclic Voltammetry ◽  
Liquid Phase ◽  
Electrochemical Properties ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Morphology ◽  
Persistence Rate ◽  
One Step

Nickel-doped manganese dioxide (Ni-MnO2) as electrode materials for supercapacitors were successfully prepared by one-step chemical liquid phase coprecipitation with the different nickel doped proportions. X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) were used to analyze the micro-structure, morphology and composition. And electrochemical properties were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). The results revealed that MnO2 synthesized in this work turned out to be δ-MnO2 of homogeneous dispersion and excellent electrochemical properties. Specific capacitance of 300.85 F/g was achieved for the 2% Ni-doped MnO2 at 2mV/s through cyclic voltammetry, and after 5000 circles the persistence rate of which still remained to 75%, exhibiting a preeminent advantage of stability and reversibility to naked MnO2.

Particle Morphology and Electrochemical Performance of LiFePO4 Synthesized via Hydrothermal Process at 200°C

2011 ◽  
Vol 391-392 ◽  
pp. 926-930
Author(s):  
Lin Jing Zhang ◽  
Bo Rong Wu ◽  
Ning Li ◽  
Feng Wu
Keyword(s):  
Electrochemical Performance ◽  
Ph Value ◽  
Hydrothermal Process ◽  
Rate Capability ◽  
Particle Morphology ◽  
Solution Concentration ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Rate Capability

LiFePO4powders were synthesized from LiOH•H2O, FeSO4•7H2O, and H3PO4 via the hydrothermal process at 200。C . The particle sizes, morphology and electrochemical performance of the as-synthesized LiFePO4particles varied from the pH value, reaction time and solution concentration of the precursor. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvaostdtic charge-discharge tests. The results indicated that the samples with carbon coating after reacting at pH value of 9 for 4h exhibited good rate capability, which had small particle size and plate-like morphology.

A Templated Carbon Prepared by Using a Clinoptilolite-Ca Mineral as Template and Furfuralcohol as Carbon Source: Pore Structure and Electrochemical Performance in H2SO4

2011 ◽  
Vol 66-68 ◽  
pp. 764-767
Author(s):  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Lili Zhang ◽  
Bao Sen Wang ◽  
Ying He
Keyword(s):  
Carbon Source ◽  
Electrochemical Performance ◽  
Pore Structure ◽  
Rate Capability ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Scan Rate ◽  
Micro Morphology ◽  
Good Rate Capability ◽  
Templated Carbon

A templated carbon has been prepared by using a clinoptilolite-Ca mineral as template and furfuralcohol as carbon source. X-ray diffraction (XRD), nitrogen adsorption, scanning electric microscope (SEM) and cyclic voltammetry (CV) are used to analyze the phase composition, pore structure, micro morphology and electrochemical performance. The specific surface area of the templated carbon is 590m2/g and the mesoporosity is high to 63.4%. In H2SO4 medium, due to its rich mesopores, the carbon exhibits a large capacity and a good rate capability. The capacity of the carbon is 174F/g at a scan rate of 5mV/s. When the scan rate increases from 5 to 300mV/s, the capacity of the carbon decreases only from 174 to 144F/g, exhibiting a good rate capability.

Preparation and Performance of Co3O4/Polyaniline Nano-Composite for Supercapacitor

2011 ◽  
Vol 239-242 ◽  
pp. 2042-2045 ◽  
Author(s):  
Shu Ping Yu ◽  
Xiao Cong Chang ◽  
Zhong Ming Wang ◽  
Ke Fei Han ◽  
Hong Zhu
Keyword(s):  
Cyclic Voltammetry ◽  
Emulsion Polymerization ◽  
Cobalt Oxide ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
Nano Composite ◽  
X Ray ◽  
Scan Rate ◽  
And Performance

Cobalt oxide-Polyaniline (Co3O4/PANI) nanocomposites were prepared via inverted emulsion polymerization. The structure of the obtained composites were characterized by X-ray diffraction (XRD). The electrochemical behavior was studied by cyclic voltammetry(CV) and electrochemical impedance spectrometry(EIS) experiments. The Co3O4/PANI(1:2) composite calcined at 400°C exhibits the highest capacitance value of 357 F/g at the scan rate of 5mV/s.

Control of the phase composition of advanced calcium phosphates using an x-ray diffractometer with a curved position-sensitive detector

2020 ◽  
Vol 86 (6) ◽  
pp. 29-35
Author(s):  
V. P. Sirotinkin ◽  
O. V. Baranov ◽  
A. Yu. Fedotov ◽  
S. M. Barinov
Keyword(s):  
Phase Composition ◽  
Calcium Phosphates ◽  
Position Sensitive Detector ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
X Ray ◽  
Impurity Phases ◽  
Position Sensitive ◽  
Diffraction Peaks ◽  
Diffraction Patterns

The results of studying the phase composition of advanced calcium phosphates Ca10(PO4)6(OH)2, β-Ca3(PO4)2, α-Ca3(PO4)2, CaHPO4 · 2H2O, Ca8(HPO4)2(PO4)4 · 5H2O using an x-ray diffractometer with a curved position-sensitive detector are presented. Optimal experimental conditions (angular positions of the x-ray tube and detector, size of the slits, exposure time) were determined with allowance for possible formation of the impurity phases during synthesis. The construction features of diffractometers with a position-sensitive detector affecting the profile characteristics of x-ray diffraction peaks are considered. The composition for calibration of the diffractometer (a mixture of sodium acetate and yttrium oxide) was determined. Theoretical x-ray diffraction patterns for corresponding calcium phosphates are constructed on the basis of the literature data. These x-ray diffraction patterns were used to determine the phase composition of the advanced calcium phosphates. The features of advanced calcium phosphates, which should be taken into account during the phase analysis, are indicated. The powder of high-temperature form of tricalcium phosphate strongly adsorbs water from the environment. A strong texture is observed on the x-ray diffraction spectra of dicalcium phosphate dihydrate. A rather specific x-ray diffraction pattern of octacalcium phosphate pentahydrate revealed the only one strong peak at small angles. In all cases, significant deviations are observed for the recorded angular positions and relative intensity of the diffraction peaks. The results of the study of experimentally obtained mixtures of calcium phosphate are presented. It is shown that the graphic comparison of experimental x-ray diffraction spectra and pre-recorded spectra of the reference calcium phosphates and possible impurity phases is the most effective method. In this case, there is no need for calibration. When using this method, the total time for analysis of one sample is no more than 10 min.

Formation of nanoscale sodium dodecahydro-closo- dodecaborate Na2[B12H12] on silicate matrix surface

2019 ◽  
Vol 484 (1) ◽  
pp. 41-43
Author(s):  
E. A. Malinina ◽  
V. K. Skachkova ◽  
I. V. Kozerozhets ◽  
V. V. Avdeeva ◽  
L. V. Goeva ◽  
...  
Keyword(s):  
Phase Composition ◽  
Ammonium Salt ◽  
Liquid Glass ◽  
Silicate Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Salt Sample ◽  
Matrix Surface

The method of nanoscaled sodium dodecahydro-closo-dodecaborate Na2[B12H12] synthesis is presented. The composite is heated to 200°C to yield the desired product, forming with the introduction of triethyl- ammonium salt [Et3NH]2[B12H12] into the silicate matrix of a sodium liquid glass. The morphology and phase composition of the synthesized sample are studied through SEM and X-ray diffraction methods, in comparison to those of a standard salt sample Na2[B12H12]. Based on the obtained data, the sample under study is an amorphous composite, on the surface of which nanoscale crystals of Na2[B12H12] form.

Hydrophobic Ferrocene Derivatives as Potential Standards in Electrochemistry

1997 ◽  
Vol 62 (2) ◽  
pp. 185-198 ◽  
Author(s):  
Jaroslav Podlaha ◽  
Petr Štěpnička ◽  
Róbert Gyepes ◽  
Vladimír Mareček ◽  
Alexander Lhotský ◽  
...  
Keyword(s):  
Surface Tension ◽  
Cyclic Voltammetry ◽  
Redox Potential ◽  
Diffusion Coefficients ◽  
Carbon Electrodes ◽  
X Ray Diffraction ◽  
Ferrocene Derivatives ◽  
X Ray ◽  
Special Cases ◽  
As Solubility

Ferrocene (FcH) derivatives monosubstituted by palmitoyl (1), hexadecyl (2), 1-adamantoyl (3) or 1-adamantylmethyl (4) groups were sythesized and characterized by NMR, mass and 57Fe Mossbauer spectroscopy. The structure of 1-adamantoylferrocene was determined by single-crystal X-ray diffraction. Cyclic voltammetry on gold and glass-like carbon electrodes demonstrated that the compounds can serve as electrochemical standards for special cases since their ferrocene/ferricinium redox potential remains stable and reversible, while the properties such as solubility, diffusion coefficients and surface tension are strongly solvent-dependent.

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