scholarly journals Preparation of Mesoporous Structure Electrode Materials ZnMn2O4 by Co-precipitation Method

2020 ◽  
Vol 145 ◽  
pp. 02057
Author(s):  
Jiaxing Song ◽  
Tao Guo ◽  
Qiong Wang ◽  
Miao Yao ◽  
Yiming Mao
Keyword(s):  
Oxalic Acid ◽  
Electrode Material ◽  
Electrode Materials ◽  
Zinc Acetate Dihydrate ◽  
Mesoporous Structure ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Manganese Sulfate ◽  
Calcination Temperatures ◽  
Co Precipitation

In order to study the fast and efficient method of preparing electrode material ZnMn2O4, in this paper, oxalic acid was selected as the precipitator, oxalic acid dihydrate (C2H2O4•2H2O) as the chemical precipitator, manganese sulfate monohydrate (MnSO4•H2O) as the manganese source and zinc acetate dihydrate (C4H6O4Zn•2H2O) as the zinc source. The precursor was prepared by co-precipitation method. Then, ZnMn2O4 powders with mesoporous structure were obtained at different calcination temperatures. The phase of ZnMn2O4 powders at different calcination temperatures was characterized by XRD analysis. After considering the crystallinity and high temperature agglomeration, samples calcinated at 600oC were selected as the cathode material of the battery, and were characterized by SEM and TEM. The experimental results show that the electrode material ZnMn2O4 prepared by this method has high crystallinity, high preparation efficiency, energy saving, environmental protection and good dispersion.

Preparation and Electrochemical Performance of Mn3O4/GR Composites Electrode Material in Supercapacitors

2019 ◽  
Vol 807 ◽  
pp. 50-56
Author(s):  
Yun Long Zhou ◽  
Zhi Biao Hu ◽  
Li Mei Wu ◽  
Jiao Hao Wu
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Manganese Sulfate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
A Current ◽  
Discharge Test

Using hydrated manganese sulfate and general type graphene (GR) as raw materials, Mn3O4/GR composite has been successfully prepared by the liquid phase chemical co-precipitation method at room temperature. X-ray diffraction (XRD) was used to investigate the phase structure of Mn3O4powder and Mn3O4/GR composite; The electrochemical performances of the samples were elucidated by cyclic voltammetry and galvanostatic charge-discharge test in 0.5 mol/L Na2SO4electrolyte. The results show that the Mn3O4/GR composite possesses graphene phase and good reversibility; the composite also displays a specific capacitance of 318.8 F/g at a current density of 1 A/g.

Preparation and Electrochemical Performance of Praseodymium Doped SnO2 Particles as Negative Electrode Material of Lithium-Ion Battery

2014 ◽  
Vol 492 ◽  
pp. 370-374
Author(s):  
Xiao Zhen Liu ◽  
Guang Jian Lu ◽  
Xiao Zhou Liu ◽  
Jie Chen ◽  
Han Zhang Xiao
Keyword(s):  
Lithium Ion Battery ◽  
Electrode Material ◽  
Electrode Materials ◽  
Raw Materials ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Xrd Analysis ◽  
Coprecipitation Method ◽  
Negative Electrode Material

Pr doped SnO2 particles as negative electrode material of lithium-ion battery are synthesized by the coprecipitation method with SnCl4·5H2O and Pr2O3 as raw materials. The structure of the SnO2 particles and Pr doped SnO2 particles are investigated respectively by XRD analysis. Doping is achieved well by coprecipitation method and is recognized as replacement doping or caulking doping. Electrochemical properties of the SnO2 particles and Pr doped SnO2 particles are tested by charge-discharge and cycle voltammogram experimentation, respectively. The initial specific discharge capacity of Pr doped SnO2 the negative electrode materials is 676.3mAh/g. After 20 cycles, the capacity retention ratio is 90.5%. The reversible capacity of Pr doped SnO2 negative electrode material higher than the reversible capacity of SnO2 negative electrode material. Pr doped SnO2 particles has good lithiumion intercalation/deintercalation performance.

scholarly journals Influence of ZrO2 Nanoparticles on the Microstructural Development of Cement Mortars with Limestone Aggregates

2019 ◽  
Vol 9 (3) ◽  
pp. 598
Author(s):  
Danna Trejo-Arroyo ◽  
Karen Acosta ◽  
Julio Cruz ◽  
Ana Valenzuela-Muñiz ◽  
Ricardo Vega-Azamar ◽  
...  
Keyword(s):  
Xrd Analysis ◽  
Sem Analysis ◽  
Precipitation Method ◽  
Zro2 Nanoparticles ◽  
Microstructural Development ◽  
Cement Ratio ◽  
Cement Mortars ◽  
Crystallite Sizes ◽  
Co Precipitation ◽  
Two Stages

In this research, the effect of the addition of zirconium oxide-synthesized nanoparticles on the microstructural development and the physical–mechanical properties of cement mortars with limestone aggregates was studied. Zirconia nanoparticles were synthesized using the co-precipitation method. According to XRD analysis, a mixture of tetragonal (t) and monoclinic (m) zirconia phases was obtained, with average crystallite sizes around 15.18 and 17.79 nm, respectively. Based on the ASTM standards, a mixture design was obtained for a coating mortar with a final sand/cement ratio of 1:2.78 and a water/cement ratio of 0.58. Control mortars and mortars with ZrO2 additions were analyzed for two stages of curing of the mortar—7 and 28 days. According to SEM analysis, mortars with ZrO2 revealed a microstructure with a high compaction degree and an increase in compressive strength of 9% on the control mortars. Due to the aggregates’ characteristics, adherence with the cement paste in the interface zone was increased. It is suggested that the reinforcing effect of ZrO2 on the mortars was caused by the effect of nucleation sites in the main phase C–S–H and the inhibition of the growth of large CH crystals, and the filler effect generated by the nanometric size of the particles. This produced a greater compaction volume, suggesting that faults are probably originated in the aggregates.

The Preparation and Characterization of LiFe0.98Mn0.02PO4/C by Spray-Drying and Low Temperature Reduction Route

2012 ◽  
Vol 581-582 ◽  
pp. 525-528
Author(s):  
Jia Feng Zhang ◽  
Bao Zhang ◽  
Xue Yi Guo ◽  
He Zhang Chen ◽  
Jian Long Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Spray Drying ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Temperature Reduction ◽  
Co Precipitation ◽  
Low Temperature Reduction

The LiFe0.98Mn0.02PO4/C was synthesized by spray-drying and low temperature reduction route using FePO4•2H2O as precursor, which was prepared by a simple co-precipitation method. The LiFe0.98Mn0.02PO4/C sample was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical measurements. The XRD analysis and SEM images show that sample has the good ordered structure and spherical particle. The charge-discharge tests demonstrate that the powder has the better electrochemical properties, with an initial discharge capacity of 162.1 mAh•g−1 and 155.8 mAh•g−1 at current density of 0.1 C and 1C, respectively. The capacity retention reaches 99.4% after 100 cycles at 1C.

Multidoped Ln3+ gadolinium dioxycarbonates as tunable white light emitting phosphors

2017 ◽  
Vol 46 (9) ◽  
pp. 2785-2792 ◽  
Author(s):  
I. Nelli ◽  
A. M. Kaczmarek ◽  
F. Locardi ◽  
V. Caratto ◽  
G. A. Costa ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
White Light ◽  
Precipitation Method ◽  
Light Emitting ◽  
Co Precipitation ◽  
Co Doped

Gadolinium dioxycarbonates co-doped with different visible emitting lanthanides were synthesized via a co-precipitation method using oxalic acid as a precipitating agent.

scholarly journals Synthesis of nanocomposite coating based on TiO2/ZnAl layer double hydroxides

2017 ◽  
Vol 67 (325) ◽  
pp. 112 ◽  
Author(s):  
V. Jovanov ◽  
O. Rudic ◽  
J. Ranogajec ◽  
E. Fidanchevska
Keyword(s):  
Mechanical Activation ◽  
Catalyst Support ◽  
Xrd Analysis ◽  
Nanocomposite Coating ◽  
Precipitation Method ◽  
Cleaning Efficiency ◽  
Co Precipitation ◽  
Layer Double Hydroxides ◽  
Double Hydroxides ◽  
Water Rinsing

The aim of this investigation was the synthesis of nanocomposite coatings based on Zn-Al layered double hydroxides (Zn-Al LDH) and TiO2. The Zn-Al LDH material, which acted as the catalyst support of the active TiO2 component (in the content of 3 and 10 wt. %), was synthesized by a low super saturation co-precipitation method. The interaction between the Zn-Al LDH and the active TiO2 component was accomplished by using vacuum evaporation prior to the mechanical activation and only by mechanical activation. The final suspension based on Zn-Al LDH and 10wt. % TiO2, impregnated only by mechanical activation, showed the optimal characteristics from the aspect of particle size distribution and XRD analysis. These properties had a positive effect on the functional properties of the coatings (photocatalytic activity and self-cleaning efficiency) after the water rinsing procedure.

scholarly journals Synthesis, Characterization, and Antimicrobial Activity of Magnesium-Doped Hydroxyapatite Suspensions

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1295 ◽  
Author(s):  
Daniela Predoi ◽  
Simona Liliana Iconaru ◽  
Mihai Valentin Predoi ◽  
George E. Stan ◽  
Nicolas Buton
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Properties ◽  
Spherical Shape ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Gram Positive ◽  
Gram Negative ◽  
Morphological Studies ◽  
Average Grain Size ◽  
Co Precipitation

Obtaining nanoscale materials has allowed for the miniaturization of components, which has led to the possibility of achieving more efficient devices with faster functions and much lower costs. While hydroxyapatite [HAp, Ca10(PO4)6(OH)2] is considered the most widely used material for medical applications in orthopedics, dentistry, and general surgery, the magnesium (Mg) is viewed as a promising biodegradable and biocompatible implant material. Furthermore, Mg is regarded as a strong candidate for developing medical implants due to its biocompatibility and antimicrobial properties against gram-positive and gram-negative bacteria. For this study, magnesium-doped hydroxyapatite (Ca10−xMgx (PO4)6 (OH)2, xMg = 0.1), 10MgHAp, suspensions were successfully obtained by an adapted and simple chemical co-precipitation method. The information regarding the stability of the nanosized 10MgHAp particles suspension obtained by ζ-potential analysis were confirmed for the first time by a non-destructive ultrasound-based technique. Structural and morphological studies of synthesized 10MgHAp were conducted by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy in attenuated total reflectance (ATR) mode and scanning electron microscopy (SEM). The XRD analysis of the 10MgHAp samples confirmed that a single crystalline phase associated to HAp with an average grain size about 93.3 nm was obtained. The FTIR-ATR spectra revealed that the 10MgHAp sample presented broader IR bands with less visible peaks when compared to a well-crystallized pure HAp. The SEM results evidenced uniform MgHAp nanoparticles with spherical shape. The antimicrobial activity of the 10MgHAp suspension against gram-positive strains (Staphylococcus aureus ATCC 25923, Enterococcus faecalis ATCC 29212), gram-negative strains (Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853), as well as a fungal strain (Candida albicans ATCC 90029) were evaluated.

scholarly journals Phyto-inspired and scalable approach for the synthesis of PdO–2Mn2O3: a nano-material for application in water splitting electro-catalysis

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 29961-29974
Author(s):  
Taghazal Zahra ◽  
Khuram Shahzad Ahmad ◽  
Andrew Guy Thomas ◽  
Camila Zequine ◽  
Ram K. Gupta ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrode Material ◽  
Precipitation Method ◽  
Electro Catalysis ◽  
Nano Material ◽  
Co Precipitation

A modified co-precipitation method has been used for the synthesis of PdO–2Mn2O3 nanocomposite as an efficient electrode material for the electro-catalytic oxygen evolution (OER) and hydrogen evolution reaction (HER).

Synthesis and Characterization of MWCNT/CaCO3 Hybrid Compound

2011 ◽  
Vol 364 ◽  
pp. 460-464 ◽  
Author(s):  
Siti Shuhadah Mohd Saleh ◽  
Md Akil Hazizan ◽  
Muhammad Helmi Abdul Kudus
Keyword(s):  
Multiwall Carbon Nanotubes ◽  
Reduction Process ◽  
Chemical Vapor ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Nickel Salt ◽  
Hybrid Compound ◽  
Hrtem Micrographs ◽  
Co Precipitation

In this work, the chemical vapor deposition (CVD) technique was used to synthesis the multiwall carbon nanotubes/calcium carbonate (MWCNT/CaCO3) hybrid compound. A gas mixture of CH4/N2was used as the source of carbon and Ni/CaCO3was used as catalyst for the growth of the hybrid compound. The catalyst was prepared using a mixture of nickel salt and CaCO3via co-precipitation method. In short, the process involves the drying of the precipitate followed by calcinations at 900°C. Reduction process was carried under H2at 400°C and growth in CH4/N2mixture at 800°C for 30 minutes .The resulted compound was then analyzed using XRD, SEM and HRTEM. From XRD analysis the CNT/ CaCO3was successfully synthesized. HRTEM micrographs support the formation of MWCNT on the CaCO3surface.

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