Hierarchically Porous Carbon/MnO2 Nanocomposites as High-Performance Electrode for Asymmetric Supercapacitors

2014 ◽  
Vol 1070-1072 ◽  
pp. 530-533
Author(s):  
Yu Rong Liu ◽  
Jia Liu
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Asymmetric Supercapacitor ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
Asymmetric Supercapacitors ◽  
Hierarchically Porous ◽  
X Ray ◽  
Supercapacitor Applications ◽  
Scanning Electron

Hierarchically porous carbon (HPC)/MnO2 nanocomposites were fabricated for asymmetric supercapacitor applications. The microstructures of HPC/MnO2 nanocomposites were characterized by X-ray diffraction and scanning electron microscopy. The asymmetric supercapacitor consisting of a HPC/MnO2 cathode and a HPC anode shows an excellent performance with energy density and power density of 23.8 Wh kg-1 and 12.5 kW kg-1, respectively. In addition, the asymmetric supercapacitor exhibits an excellent cycle life with 91% retention of capacitance after 1000 cycles.

Green and facile synthesis of nanosized polythiophene as an organic anode for high-performance potassium-ion battery

2018 ◽  
Vol 11 (06) ◽  
pp. 1840003 ◽  
Author(s):  
Guifang Zeng ◽  
Yongling An ◽  
Huifang Fei ◽  
Tian Yuan ◽  
Sun Qing ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Performance ◽  
Reversible Capacity ◽  
Potassium Ion ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
Facile Synthesis ◽  
X Ray ◽  
Scanning Electron

In this work, nanosized polythiophene (PTh) is synthesized via a green and facile method. The obtained nanosized PTh was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller theory (BET) and scanning electron microscopy (SEM). The result indicated that a nanosized, porous and amorphous PTh was synthesized. As an organic anode material for potassium ion battery, the PTh shows excellent performance with a reversible capacity of 58[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 30[Formula: see text]mA[Formula: see text]g[Formula: see text].

scholarly journals Nano MnO2 Radially Grown on Lignin-Based Carbon Fiber by One-Step Solution Reaction for Supercapacitors with High Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 594 ◽  
Author(s):  
Chenyan Guo ◽  
Haitong Ma ◽  
Qingtong Zhang ◽  
Mingfu Li ◽  
Hongrui Jiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Fiber ◽  
High Performance ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
One Step ◽  
Solution Reaction ◽  
Supercapacitor Applications ◽  
Scanning Electron

MnO2-deposited lignin-based carbon fiber (MnO2-LCF) mats are fabricated for supercapacitor applications. LCF mats are produced from alkali lignin via electrospinning followed by stabilization and carbonization. The carbonization process is carried out at 800, 900, and 1000 °C, and the corresponding mats are denoted as MnO2-LCF-800, MnO2-LCF-900, and MnO2-LCF-1000, respectively. The LCF mats are immersed in a KMnO4 solution at room temperature for 72 h to obtain MnO2-LCF mats. The scanning electron microscopy and X-ray diffraction analysis confirm the deposition of MnO2 on the LCFs. The Brunauer–Emmett–Teller analysis, X-ray spectroscopy, and Raman spectroscopy reveal that MnO2-LCF-800 mat possesses a large number of mesopores and Mn vacancies as compared to MnO2-LCF-900 mat and MnO2-LCF-1000 mat. Consequently, MnO2-LCF-800 mat possesses the best electrochemical properties with a specific capacitance of 131.28 F∙g−1, an energy density of 14.77 Wh∙kg−1, and a power density of 135.01 W∙kg−1 at a specific current of 0.3 A∙g−1. Hence, MnO2-LCF-800 mat shows high potential to be used as a high-performance supercapacitor.

Multifunctionality exploration on NiCo2O4–rGO nanocomposites: Photochemical water oxidation, methanol electro-oxidation and asymmetric supercapacitor applications

2021 ◽  
Author(s):  
Vikash Gajraj ◽  
Alesh Kumar ◽  
Ekta Dadarwal ◽  
Rahul Kaushik ◽  
Amilan Jose Devadoss ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hydrothermal Method ◽  
Water Oxidation ◽  
Asymmetric Supercapacitor ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Electron Microscopies ◽  
Electro Oxidation ◽  
Supercapacitor Applications

Different weight percentages of NiCo2O4–rGO nanocomposites were prepared via a facile hydrothermal method. The prepared nanocomposites were structurally and morphologically characterized by X-ray diffraction, Raman spectroscopy and electron microscopies. The...

High-performance electrical properties of La-based perovskite ceramics for the functional phase of thick film resistors

2020 ◽  
Author(s):  
Yongcheng Lu ◽  
Yuanxun Li ◽  
Daming Chen ◽  
Rui Peng ◽  
Qinghui Yang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrical Properties ◽  
Thick Film ◽  
High Performance ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alternative Material ◽  
Perovskite Ceramics ◽  
Scanning Electron

Abstract In order to explore an economical functional phase alternative material for thick film resistors, the crystal structure, microstructure, and electrical properties of (1-x)LSCN + xLCNZ (x = 0.0–1.0) composite ceramics were studied through solid-state reaction experiments. The composite ceramics were characterized by x–ray diffraction, scanning electron microscopy, energy dispersive x–ray spectroscopy, and DC four–probe method. Results suggested that the main phases of LSCN and LCNZ were formed, along with a small part of impurity phases. The addition of LCNZ to LSCN decreased the electrical conductivity and changed the TCR from positive to negative. Zero TCR could be achieved around 0.6 < x < 0.8 and relatively low absolute TCR values could be obtained for the samples of 0.4 ≤ x ≤ 0.8. The ceramic of 0.6LSCN + 0.4LCNZ showed the optimal performances of conductivity = 1923 S/cm, TCR = 379.54 ppm/℃, and relative density = 95.05%.

Boosting supercapacitor and capacitive deionization performance of hierarchically porous carbon by polar surface and structural engineering

2020 ◽  
Vol 8 (5) ◽  
pp. 2505-2517 ◽  
Author(s):  
Silu Huo ◽  
Yubo Zhao ◽  
Mingzhu Zong ◽  
Bolong Liang ◽  
Xueli Zhang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Structural Engineering ◽  
Carbon Materials ◽  
Capacitive Deionization ◽  
Polar Surface ◽  
Hierarchically Porous ◽  
Porous Carbon Materials ◽  
Supercapacitor Applications

Heteroatom doped hierarchically porous carbon materials are considered as promising candidates for high performance capacitive deionization and supercapacitor applications.

Study the Effect of HAp Content in PLA/HAp Microsphere on the Efficiency of Drug (Clindamycin) Loading Process

2013 ◽  
Vol 834-836 ◽  
pp. 559-562 ◽  
Author(s):  
Juntima Pradid ◽  
Wirunya Keawwattana ◽  
Siree Tangbunsuk
Keyword(s):  
Electron Microscopy ◽  
Thermal Process ◽  
High Performance ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ultrasound Field ◽  
Sample Characterization ◽  
Core Shell Structure ◽  
Scanning Electron

An ultrasound field was applied to obtain Polylactic acid (PLA)/Hydroxyapatite (HAp) biocomposite microspheres with the specific core-shell structure to be applied as a carrier of a drug. The hydroxyapatite was obtained from crocodile bone by thermal process. Sample characterization was achieved by powder X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX) Scanning electron microscopy (SEM) and High Performance Liquid Chromatography (HPLC). As the result, the PLA/HAp loading clindamycin with different polymer-to-ceramic part wt.% ratio (100:0, 90:10, 80:20, and 70:30) showed the agglomeration of sphere-like particles. In addition, the loading efficiency of clindamycin increased with increasing HAp content up to 20%.

Amphiphilic Functionalized Montmorillonite as Possible Carriers for Hydrophobic Compounds

2019 ◽  
Vol 956 ◽  
pp. 260-269
Author(s):  
Ke Xuan Shen ◽  
Shi Yong Sun ◽  
Ke Wang ◽  
Biao Biao Ma ◽  
Fa Qin Dong ◽  
...  
Keyword(s):  
Water Soluble ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
Model Compounds ◽  
X Ray ◽  
Hydrophobic Compounds ◽  
Poorly Water Soluble ◽  
Contact Angle Analysis ◽  
Carrier Systems ◽  
Scanning Electron

Amphiphilic functionalized montmorillonite (MMT) has been employed in hydrophobic compounds delivery systems. In the present study, MMT intercalated by 3-aminopropyl trimethoxysilane (APS) was employed for the delivery of the model compounds of resveratrol (RSV). The structure and surface morphology of APS-MMT were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetry, scanning electron microscopy, and contact angle analysis. The loading and release efficiencies of RSV were also investigated. Our study showed that the aminosilane-modified MMT is promising for use in poorly water-soluble compounds carrier systems owing to their natural and excellent performance.

Synthesis of Hierarchy-Structural BaTiO3 Powder Used for X8R Multilayer Ceramic Capacitors by Two-Step Soft Chemical Method

2014 ◽  
Vol 906 ◽  
pp. 3-7
Author(s):  
Jing Wang ◽  
Gui Juan Rong ◽  
Yu Ding ◽  
Ting Wei Wang ◽  
Hao Yao
Keyword(s):  
High Performance ◽  
Chemical Method ◽  
X Ray Diffraction ◽  
Multilayer Ceramic Capacitors ◽  
X Ray ◽  
Dielectric Peak ◽  
Microstructural Evaluation ◽  
The Hierarchical Structure ◽  
Multilayer Ceramic ◽  
Scanning Electron

Ba0.985Bi0.01TiO3-BaTi1-xZrxO3 powders have been synthesized by two-step soft chemical method to satisfy EIA-X8R specification. Microstructural evaluation conducted by X-ray diffraction and scanning electron microscopy confirms the hierarchical structure of the ceramic grain. The shape of the ε-T curves near the dielectric peak becomes broad with the increase of Zr content. The permittivity of Ba0.985Bi0.01TiO3-BaTi0.9Zr0.1O3 ceramic is ~3000, C/C20 °C is-14.67%, 6.23% and-14.50% at-55°C, 130°C and 160°C, respectively, and the dielectric loss is less than 0.020. This work shows that the two-step soft chemical method is a promising approach for high performance temperature-stable capacitor materials.

Experiment Study on the Effect of GGBFS on Frost Resistance of Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 207-212 ◽  
Author(s):  
Shi Yi Zhang ◽  
Ying Fang Fan ◽  
Qi Wang
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Plain Concrete ◽  
Industrial Wastes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Scanning Electron

High volume utilization of industrial wastes and by products is the solution for high disposal coast. The anti-frost of high performance concrete is a key factor for safe utilization of concrete structure containing industrial wastes under severe environment. In this paper, to understand the property on anti-frost of high performance containing ground granulated blast furnace slag (GGBFS) under cold marine environment. Some comparison studies were conducted on plain concrete by rapid freeze-thaw cycle test. During the rapid freeze-thaw cycle test, the mass loss and relative elastic modulus were measured regularly at the prescribed conditioning ages. The development of microstructure in concrete was analyzed through scanning electron microscopy (SEM) and X-ray diffraction (XRD). The rapid freeze-thaw cycle test results show that the plain concrete was destroyed severely at 150 freeze-thaw cycles. After 225 freeze-thaw cycles, the mass loss and the relative dynamic modulus of elasticity of GGBFS concrete decrease 1.3% and 26.11%, respectively, that indicates that GGBFS significantly improve the anti-frost performance of concrete; The addition of GGBFS can accelerate the cement hydration reaction, promote more Ca (OH)2 crystals shift to C-S-H gel and help to increase the density of the micro-structure of concrete, which can prevent the formation of micro-cracks and suppress the propagation of cracks and thus effectively improve the durability of concrete. KEY WORDS: GGBFS; freeze-thaw durability; microstructure; scanning electron microscopy; X-ray diffraction.

Biomorphous Porous Carbon Prepared from Cotton Stalk

2012 ◽  
Vol 253-255 ◽  
pp. 871-874
Author(s):  
Qing Wang ◽  
Xi Cheng ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Weight Loss ◽  
Porous Carbon ◽  
Cotton Stalk ◽  
Pyrolysis Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Structures ◽  
Scanning Electron

The biomorphic porous carbon was prepared by high temperature pyrolysis at 1000oC. The pyrolysis process of cotton stalk was measured by thermogravimetric analysis (TG). The morphology and microstructure of carbon were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. As compared with the dried cotton stalk, the carbon has an anisotropic shrinkage with 20–40% and about 80% weight loss. The carbon retains the tubular cell structures.

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