Facile Hydrothermal Synthesis of Molybdenum Disulfide (MoS2) as Advanced Electrodes for Super Capacitors Applications

MRS Advances ◽  
2016 ◽  
Vol 1 (45) ◽  
pp. 3089-3097 ◽  
Author(s):  
H. Adhikari ◽  
C. Ranaweera ◽  
R. Gupta ◽  
S. R. Mishra
Keyword(s):  
Reaction Time ◽  
Electrochemical Properties ◽  
Molybdenum Disulfide ◽  
Electrode Materials ◽  
Hydrothermal Reaction ◽  
Three Dimensional ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Supercapacitor Applications ◽  
Hydrothermal Reaction Time

ABSTRACTA facile hydrothermal method was used to synthesize molybdenum disulfide (MoS2) microspheres. The effect of hydrothermal reaction time on morphology and electrochemical properties of MoS2 microspheres was evaluated. X-ray diffraction showed presence of crystalline MoS2 structure, where content of crystalline phase was observed to increase with hydrothermal reaction time. Electrochemical properties of MoS2 were evaluated using cyclic voltammetry (CV) and galvanostatic charge-discharge in 3M KOH solution. Specific capacitance of nanostructured MoS2 was observed to be between 68 F/g and 346 F/g at different scan rates along with excellent cyclic stability. High power density (∼1200 W/kg) and energy density (∼5 Wh/kg) was observed for MoS2 sample synthesized for 24 hours of hydrothermal reaction time. Overall optimal electrocapactive performance was observed for sample prepared for 24 hours of reaction time. It is demonstrated that the obtained MoS2 microspheres with three-dimensional architecture has excellent electrochemical performances as electrode materials for supercapacitor applications.

Effect of hydrothermal dwell time on the diameter-controlled synthesis and magnetic property of MnO2 nanorods

2014 ◽  
Vol 28 (06) ◽  
pp. 1450045 ◽  
Author(s):  
Arbab Mohammad Toufiq ◽  
Fengping Wang ◽  
Qurat-ul-Ain Javed ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Dwell Time ◽  
Hydrothermal Reaction ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Transmission Electron ◽  
Facile Hydrothermal Route ◽  
Hydrothermal Reaction Time

In this paper, single crystalline 1D tetragonal MnO 2 pen-type nanorods were synthesized by varying the dwell time through a facile hydrothermal route at a reaction temperature of 250°C. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the diameter of MnO 2 nanorods decreases from 460 nm to 250 nm with the increase in hydrothermal reaction time from 5 h to 15 h. Field-emission scanning electron microscopy (FESEM) and TEM studies revealed the evolution of improved surface morphology of MnO 2 nanorods that are prepared with longer hydrothermal reaction time. The magnetic properties of the products were evaluated using vibrating sample magnetometer (VSM) at room temperature, which showed that the as-prepared samples exhibit weak ferromagnetic behavior. The effect of diameter on the magnetization values was observed and discussed in detail.

scholarly journals Synthesis, Structures and Electrochemical Properties of Lithium 1,3,5-Benzenetricarboxylate Complexes

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 126 ◽  
Author(s):  
Pei-Chi Cheng ◽  
Bing-Han Li ◽  
Feng-Shuen Tseng ◽  
Po-Ching Liang ◽  
Chia-Her Lin ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Crystal Transformation ◽  
Discharge Capacities

Four lithium coordination polymers, [Li3(BTC)(H2O)6] (1), [Li3(BTC)(H2O)5] (2), [Li3(BTC)(μ2-H2O)] (3), and [Li(H2BTC)(H2O)] (4) (H3BTC = 1,3,5-benzenetricarboxylatic acid), have been synthesized and characterized. All the structures have been determined using single crystal X-ray diffraction studies. Complexes 1 and 2 have two-dimensional (2-D) sheets, whereas complex 3 has three-dimensional (3-D) frameworks and complex 4 has one-dimensional (1-D) tubular chains. The crystal-to-crystal transformation was observed in 1–3 upon removal of water molecules, which accompanied the changes in structures and ligand bridging modes. Furthermore, the electrochemical properties of complexes 3 and 4 have been studied to evaluate these compounds as electrode materials in lithium ion batteries with the discharge capacities of 120 and 257 mAhg−1 in the first thirty cycles, respectively.

Sonication-Assisted Synthesis of Molybdenum Disulfide Aerogel for the Electrode Materials of Supercapacitors

NANO ◽  
2019 ◽  
Vol 14 (05) ◽  
pp. 1950055
Author(s):  
Qiang Zhang ◽  
Wenyuan He ◽  
Yinmin Wang ◽  
Dazhao Pei ◽  
Xuejun Zheng
Keyword(s):  
Specific Surface ◽  
Porous Structure ◽  
Molybdenum Disulfide ◽  
Freeze Drying ◽  
Electrode Materials ◽  
Hydrothermal Reaction ◽  
High Specific Capacitance ◽  
Electrochemical Performances ◽  
Surface Areas ◽  
Charge Discharge

The sonication processing was added in front of the freeze-drying as an intermediate processing before the molybdenum disulfide (MoS2) aerogel was synthesized. It is distinguishing with the traditional hydrothermal reaction to combine the sonication processing and freeze-drying in our method. The structure, morphology, specific surface area and pore size distribution were characterized, and the electrochemical performances were measured in 0.5[Formula: see text]M Na2SO4 electrolyte for the MoS2 aerogel and flower-like MoS2. As for comparison, they are of porous structure and microsphere structure, and their specific surface areas are 55.14[Formula: see text]m2[Formula: see text]g[Formula: see text] and 38.12[Formula: see text]m2[Formula: see text]g[Formula: see text]. The specific capacitances are 166.7[Formula: see text]F[Formula: see text]g[Formula: see text] and 119.2[Formula: see text]F[Formula: see text]g[Formula: see text] at the scan rate of 5[Formula: see text]mV[Formula: see text]s[Formula: see text], and the capacity retentions are 87.7% and 81.6% after 3000 charge/discharge cycles. For the enhanced mechanism, the high specific surface of the MoS2 aerogel causes high specific capacitance, and the unique porous structure could buffer volume expansion to improve retention ability during charge/discharge processes. The MoS2 aerogel may thus be a promising electrode material for supercapacitors.

The Effect of Hydrothermal Reaction Time on Formation of AuNPs by Sacrificial Templated Growth Hydrothermal Approach

2014 ◽  
Vol 1024 ◽  
pp. 71-74
Author(s):  
Soo Ai Ng ◽  
Abdul Razak Khairunisak ◽  
Kuan Yew Cheong ◽  
Poh Choon Ooi ◽  
Kean Chin Aw
Keyword(s):  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Xrd Analysis ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Sacrificial Template ◽  
Sem Image ◽  
Self Association ◽  
Hydrothermal Approach ◽  
Hydrothermal Reaction Time

This work describes the formation of gold nanoparticles (AuNPs) by using the sacrificial template growth hydrothermal method. AuNPs was grown on Aluminum/ polymethylsilsesquioxanes (PMSSQ) /Silicon substrates. Sputtered Al was used as a sacrificial template. The effect of hydrothermal reaction time on AuNPs properties was investigated for 1, 2, 3 and 4 hours. Properties of AuNPs were studied by using Field-Emission Scanning Electron Microscope (FESEM), X-ray Diffraction (XRD) and Semiconductor Characterization System (SCS). This approach allows the formation of AuNPs directly on the substrates. XRD analysis proved that Al template was removed during hydrothermal reaction. This approach allows the formation of AuNPs directly on the substrates. The number of AuNPs increased with increasing hydrothermal reaction time. However, longer than 1 hour reaction time, AuNPs tend to grow in clusters that could be due to unintended aggregation and agglomeration caused by self-association of the AuNPs. I-V characteristics showed hysteresis properties that indicated charge storage capability of AuNPs embedded in PMSSQ. AuNPs grown in 1 hour hydrothermal reaction produced the best memory properties due to well distribution of isolated AuNPs as observed in SEM image with the lowest abrupt current of 2.4 V.

Photophysical and electrochemical properties of a novel 4f–3d heterometallic porphyrin

2014 ◽  
Vol 18 (07) ◽  
pp. 600-603 ◽  
Author(s):  
Wen-Tong Chen ◽  
Ya-Ping Xu ◽  
Qiu-Yan Luo ◽  
Yan-Kang Dai ◽  
Shan-Lin Huang ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Electrochemical Properties ◽  
Fluorescence Lifetime ◽  
Emission Band ◽  
Hydrothermal Reaction ◽  
Three Dimensional ◽  
Ultraviolet Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Open Framework

A 4f-3d heterometallic porphyrin, [ TbCo ( TPPS ) H 3 O ]n (1) ( H 2 TPPS = tetra (4- sulfonatophenyl ) porphyrin ), has been synthesized via a hydrothermal reaction and structurally characterized by single crystal X-ray diffraction analysis. The structure of 1 consists of [ TbCo ( TPPS ) H 3 O ]n molecules. The Tb 3+ ions are coordinated by eight oxygen atoms from eight sulfonic groups, yielding a distorted square anti-prism geometry. Compound 1 is characterized by a three-dimensional (3-D) porous open framework that is thermally stable up to 350°C. Compound 1 displays a fluorescent emission band in the ultraviolet region and its fluorescence lifetime is 1.14 ms. A slow scan CV curve of compound 1 reveals one reversible wave with E1/2 being equal to -0.78 V, which is close to the value -0.74 V of DPV diagram.

Influence of hydrothermal reaction time on the supercapacitor performance of Ni-MOF nanostructures

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
M. R. Manikandan ◽  
K. P. Cai ◽  
Y. D. Hu ◽  
C. L. Li ◽  
J. T. Zhang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Supercapacitor Performance ◽  
Hydrothermal Reaction Time

A three-dimensional manganese(II) coordination polymer with two functional properties: magnetism and photochemical detection

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Dan Zhao ◽  
Yanyan An ◽  
Tingting Guo ◽  
Juanzhi Yan ◽  
Danmei Song
Keyword(s):  
Coordination Polymer ◽  
Hydrothermal Reaction ◽  
Three Dimensional ◽  
Building Blocks ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Detection Mechanism ◽  
Susceptibility Data ◽  
Dichromate Ions ◽  
Ditopic Ligand

Hydrothermal reaction of Mn2+ with the ditopic ligand 2,5-bis(1H-1,2,4-triazol-1-yl)benzoic acid (Hdtba) resulted in the complex poly[aqua[μ3-2,5-bis(1H-1,2,4-triazol-1-yl)benzoato-κ3 N 4:N 4′:O]chloridomanganese(II)] monohydrate], {[Mn(C11H7N6O2)Cl(H2O)]·H2O} n , (I). Coordination polymer I has been characterized by X-ray diffraction, IR spectroscopy, elemental analysis, thermogravimetry and susceptibility measurements. The topology of I corresponds to a three-dimensional (3,6)-conn net linked by {Mn2Cl2(COO)2} building blocks and dtba− anions. Significant antiferromagnetic exchange is observed within the dinuclear {Mn2Cl2(COO)2} subunits. A fit of the susceptibility data resulted in the magnetic parameters g = 1.93 and J = −1.52. Studies of the photoluminescence properties revealed that I represents a promising luminescence sensor for sensitively detecting dichromate ions in aqueous solution. The associated photochemical detection mechanism was studied in detail.

scholarly journals Nitrogen, Phosphorus and Sulfur Co-Doped Pyrolyzed Bacterial Cellulose Nanofibers for Supercapacitors

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1912
Author(s):  
Zheng Li ◽  
Yaogang Wang ◽  
Wen Xia ◽  
Jixian Gong ◽  
Shiru Jia ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
High Performance ◽  
Electrode Materials ◽  
Cellulose Nanofibers ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
Nitrogen Phosphorus ◽  
Co Doped

Heteroatom doping is an effective way to raise the electrochemical properties of carbon materials. In this paper, a novel electrode material including nitrogen, phosphorus, and sulfur co-doped pyrolyzed bacterial cellulose (N/P/S-PBC) nanofibers was produced. The morphologies, structure characteristics and electrochemical performances of the materials were investigated by Scanning electron microscopy, Fourier transform infrared spectra, X-ray diffraction patterns, X-ray photoelectronic spectroscopy, N2 sorption analysis and electrochemical measurements. When 3.9 atom% of nitrogen, 1.22 atom% of phosphorus and 0.6 atom% of sulfur co-doped into PBC, the specific capacitance of N/P/S-PBC at 1.0 A/g was 255 F/g and the N/P/S-PBC supercapacitors’ energy density at 1 A/g was 8.48 Wh/kg with a power density of 489.45 W/kg, which were better than those of the N/P-PBC and N/S-PBC supercapacitors. This material may be a very good candidate as the promising electrode materials for high-performance supercapacitors.

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