Facile Synthesis of Core-shell Structured CuS@PANI Microspheres and Electrochemical Capacitance Investigations

2017 ◽  
Vol 25 (6) ◽  
pp. 483-488
Author(s):  
Chunnian Chen ◽  
Qi Zhang ◽  
Chengyang Peng
Keyword(s):  
Current Density ◽  
Oxidative Polymerization ◽  
Core Shell ◽  
Discharge Process ◽  
Electrochemical Capacitance ◽  
Composite Microsphere ◽  
Pani Composite ◽  
Discharge Profile ◽  
A Current ◽  
Charge Discharge

A core-shelled structure CuS@PANI composite microsphere was successfully synthesized via chemical oxidative polymerization procedure and the electrochemical performance was investigated. The as-prepared composites were characterized by FE-SEM, TEM and XRD, and their particulate structure has been confirmed. Interestingly, the CuS microsphere was not a whole solid but composed of several sheet-like subunits, and the PANI was loosely-coated on the surface of spherical CuS particles. The advantage of this kind of core-shell structure is that PANI has better conductivity, which favors the electronic conductive channels to the CuS cores. Moreover, the loosely-attached PANI could buffer the disadvantages of the volume changes of CuS during the charge-discharge process. The galvanostatic charge/discharge profile shows a specific capacitance of 308.1 F g−1 at a current density of 0.5 A g−1 and the composite retained 71.6% of its initial capacitance after 1000 cycles at a current density of 1 A g−1.

POLY(3,4-ETHYLENEDIOXYTHIOPHENE)/MnO2 MESOPOROUS NANOCOMPOSITE WITH EXCELLENT HIGH-RATE ELECTROCHEMICAL PROPERTIES

2011 ◽  
Vol 04 (01) ◽  
pp. 31-36 ◽  
Author(s):  
QING LU ◽  
YIKAI ZHOU
Keyword(s):  
Current Density ◽  
High Rate ◽  
Discharge Process ◽  
Rate Performance ◽  
Synthetic Route ◽  
Lithium Storage ◽  
High Rate Performance ◽  
A Current ◽  
Charge Discharge

Herein, a modified interfacial synthetic route has been demonstrated by synthesizing uniform poly(3,4-ethylenedioxythiophene)/ MnO 2 hierarchical mesoporous nanocomposite. The in-situ generated polymer has been proven to be effective in constraining the overgrowth of nuclei. Consequently, assembled nanosheets with a thickness less than 5 nm have been prepared. At a high rate of 10 A g-1 charge/discharge process, the nanocomposite electrode retains 73.4% of the specific capacitance exhibited at 1 A g-1. At a current density as large as 800 mA g-1, the nanocomposite electrode attains reversible lithium storage specific capacities of 400 mAh g-1 after 50 cycles and 300 mAh g-1 after 100 cycles. The excellent high-rate performance of the nanocomposite electrode is highlighted in terms of its extremely large surface area, unique microstructure and mesoporous features.

Hollow core–shell structured Si/C nanocomposites as high-performance anode materials for lithium-ion batteries

Nanoscale ◽  
2014 ◽  
Vol 6 (6) ◽  
pp. 3138-3142 ◽  
Author(s):  
Huachao Tao ◽  
Li-Zhen Fan ◽  
Wei-Li Song ◽  
Mao Wu ◽  
Xinbo He ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Lithium Ion ◽  
Core Shell ◽  
Discharge Process ◽  
Hollow Core ◽  
A Charge ◽  
Large Volume Change ◽  
Charge Discharge

Hollow core–shell structured Si/C nanocomposites were prepared to adapt for the large volume change during a charge–discharge process.

TiO2@CdSe/CdS core–shell hollow nanospheres solar paint

RSC Advances ◽  
2014 ◽  
Vol 4 (59) ◽  
pp. 31313-31317 ◽  
Author(s):  
Xiang Zhang ◽  
Hongxia Sun ◽  
Xiyun Tao ◽  
Xingfu Zhou
Keyword(s):  
Solar Cell ◽  
Quantum Dot ◽  
Conversion Efficiency ◽  
Current Density ◽  
Core Shell ◽  
Hollow Nanospheres ◽  
A Current

TiO2@CdSe/CdS hollow nanospheres solar paint were fabricated and directly applied in quantum dot-sensitized solar cell. The reliable conversion efficiency of 0.79 was achieved with a current density of 6.6 mA cm−2.

scholarly journals Electrochemical Performances Investigation of New Carbon-Coated Nickel Sulfides as Electrode Material for Supercapacitors

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3509 ◽  
Author(s):  
Xinyu Lei ◽  
Mu Li ◽  
Min Lu ◽  
Xiaohui Guan
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
Electrode Material ◽  
Rate Capability ◽  
Nitrogen Atmosphere ◽  
Electrochemical Performances ◽  
Discharge Process ◽  
Carbon Coated ◽  
Water Bath Heating ◽  
A Current

A new carbon-coated nickel sulfides electrode material (NST/CNTs@C) has been synthesized through an easy-to-operate process: NiS2/CNTs which was prepared by a hydrothermal method reacted with BTC (1,3,5-benzenetricarboxylic acid) under the condition of water bath heating to obtain the precursor, and then the precursor was calcined in 450 °C under a nitrogen atmosphere to obtain NST/CNTs@C. The electrochemical performance of NST/CNTs@C has been greatly improved because the formation of a carbon-coated layer effectively increased the specific surface area, reduced the charge transport resistance and inhibited the morphological change of nickel sulfides in the charge–discharge process. Compared with pure NiS2 and NiS2/CNTs, NST/CNTs@C presented great specific capacitance (620 F·g−1 at a current density of 1 A·g−1), better cycle stability (49.19% capacitance retention after 1000 cycles) and more superior rate capability (when the current density was raised to 10 A·g−1 the specific capacitance remained 275 F·g−1).

Electrodeposition of PANI/MnO2 Composite on SnO2/Ti Substrate for Supercapacitor Electrode

2011 ◽  
Vol 239-242 ◽  
pp. 1372-1375 ◽  
Author(s):  
Ya Kun Zhang ◽  
Jian Ling Li ◽  
Fei Gao ◽  
Xin Dong Wang
Keyword(s):  
Cyclic Voltammetry ◽  
Synergistic Effect ◽  
Specific Capacitance ◽  
Current Density ◽  
Galvanostatic Charge ◽  
Supercapacitor Electrode ◽  
Electrochemical Tests ◽  
A Current ◽  
Charge Discharge

A layer of MnO2 was loaded between the SnO2/Ti substrate and the layer of PANI via a potentiodynamic electrodeposition. Electrochemical tests such as cyclic voltammetry and galvanostatic charge/discharge were applied to investigate the performance of the electrodes. The morphologies of the electrodes were also observed to identify the effect of the MnO2 layer. The specific capacitance of PANI with MnO2 reached to 601.48 F g-1 at a current density of 0.1 mA cm-2, which is 1.69 times as that of PANI electrodes without MnO2 layer. This gratifying result may due to the synergistic effect between MnO2 layer and PANI.

scholarly journals Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites

2017 ◽  
Vol 35 (1) ◽  
pp. 94-104 ◽  
Author(s):  
Yewen Xu ◽  
Guozhu Shen ◽  
Hongyan Wu ◽  
Bin Liu ◽  
Xumin Fang ◽  
...  
Keyword(s):  
Double Layer ◽  
Reflection Loss ◽  
Oxidative Polymerization ◽  
Single Layer ◽  
Core Shell ◽  
Total Thickness ◽  
Absorption Bandwidth ◽  
Pani Composite ◽  
Line Theory ◽  
Minimum Reflection Loss

AbstractOrganic-inorganic nano-CoFe2O4/PANI (polyaniline) multi-core/shell composites have been successfully synthesized by chemical oxidative polymerization of aniline. The characterization results showed that the ferrite nanocrystals were efficiently embedded in PANI. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. Double-layer absorbers based on the CoFe2O4/PANI composite (matching layer) and calcined CoFe2O4 ferrite (absorbing layer) have been designed. The reflection loss of the microwave absorbers of both single layer and double-layer with a total thickness of 2.0 mm and 2.5 mm was calculated according to transmission-line theory. The results indicated that the minimum reflection loss of the CoFe2O4/PANI composite was −19.0 dB at 16.2 GHz at the thickness of 2.0 mm and −23.6 dB at 13.1 GHz at the thickness of 2.5 mm, respectively. The minimum reflection loss for double-layer absorbers reached −28.8 dB at 16.2 GHz at the total thickness of 2.0 mm, and −31.1 dB at 12.8 GHz at the total thickness of 2.5 mm. The absorption bandwidth under −10 dB was 4.2 GHz (13.8 GHz to 18.0 GHz) and 5.5 GHz (10.3 GHz to 15.8 GHz), respectively. The results show that the reflection loss and absorption bandwidth of the double-layer absorbers are obviously enhanced compared to corresponding single layer absorbers.

Facile construction of ultrathin standing α-Ni(OH)2 nanosheets on halloysite nanotubes and their enhanced electrochemical capacitance

2014 ◽  
Vol 2 (29) ◽  
pp. 11299-11304 ◽  
Author(s):  
Jin Liang ◽  
Bitao Dong ◽  
Shujiang Ding ◽  
Cuiping Li ◽  
Ben Q. Li ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
Discharge Current ◽  
Halloysite Nanotubes ◽  
Cycling Stability ◽  
Hybrid Nanostructures ◽  
Electrochemical Capacitance ◽  
Discharge Current Density ◽  
High Charge ◽  
Charge Discharge

α-Ni(OH)2 nanosheets@HA hybrid nanostructures exhibit an excellent specific capacitance and cycling stability at a high charge–discharge current density.

MnOx/Ni(OH)2 Nanocomposite Materials for High-Performance Electrochemical Capacitor Application

2012 ◽  
Vol 20 ◽  
pp. 53-60 ◽  
Author(s):  
Zan Wang ◽  
Xin Wang ◽  
Yun Xiao Zhao ◽  
Cui Mei Zhao ◽  
Wei Tao Zheng
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
High Specific Capacitance ◽  
Discharge Process ◽  
Porous Network ◽  
X Ray ◽  
Capacitance Performance ◽  
Charge Discharge

Nanostructured MnOx/Ni (OH)2 composites have been electrodeposited on Ni foam for synthesis of a binder-free electrode for electrochemical capacitors with high specific capacitance and stable electrochemical properties. The microstructure, morphology and chemical composition were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Cyclic voltammetry and galvanostatic charge/discharge measurements were applied to investigate the electrochemical capacitance of the electrode active materials. The results indicated that MnOx acted as a template for growth of Ni (OH)2 with an inter-connected 3D porous network nanostructure. A maximum capacitance value of 2334 F/g at current density of 5 A/g in 1 M KOH electrolyte was achieved, much higher than that of pure Ni (OH)2 and MnOx (992 and 179 F/g, respectively). Moreover, in the charge/discharge process at even larger current density of 20 A/g, the electrode could maintain 82.8 % of the initial specific capacitance after 500 cycles, higher than that of pure Ni (OH)2 (only 46.6% remains). The enhanced capacitance performance was attributed to the synergic effect between the respective single oxides.

scholarly journals SnO2 Nanoflower–Nanocrystalline Cellulose Composites as Anode Materials for Lithium-Ion Batteries

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3165
Author(s):  
Quang Nhat Tran ◽  
Il Tae Kim ◽  
Sangkwon Park ◽  
Hyung Wook Choi ◽  
Sang Joon Park
Keyword(s):  
Anode Materials ◽  
Tin Dioxide ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Nanocrystalline Cellulose ◽  
Discharge Process ◽  
Cellulose Composites ◽  
A Current ◽  
Charge Discharge

One of the biggest challenges in the commercialization of tin dioxide (SnO2)-based lithium-ion battery (LIB) electrodes is the volume expansion of SnO2 during the charge–discharge process. Additionally, the aggregation of SnO2 also deteriorates the performance of anode materials. In this study, we prepared SnO2 nanoflowers (NFs) using nanocrystalline cellulose (CNC) to improve the surface area, prevent the particle aggregation, and alleviate the change in volume of LIB anodes. Moreover, CNC served not only as the template for the synthesis of the SnO2 NFs but also as a conductive material, after annealing the SnO2 NFs at 800 °C to improve their electrochemical performance. The obtained CNC–SnO2NF composite was used as an active LIB electrode material and exhibited good cycling performance and a high initial reversible capacity of 891 mA h g−1, at a current density of 100 mA g−1. The composite anode could retain 30% of its initial capacity after 500 charge–discharge cycles.

scholarly journals In-Situ Arc Discharge-Derived FeSn2/Onion-Like Carbon Nanocapsules as Improved Stannide-Based Electrocatalytic Anode Materials for Lithium-Ion Batteries

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 950 ◽  
Author(s):  
Dandan Han ◽  
Amrita Chatterjee ◽  
Long Hin Man ◽  
Siu Wing Or
Keyword(s):  
Crystal Growth ◽  
Discharge Capacity ◽  
Arc Discharge ◽  
Lithium Ion ◽  
Core Shell ◽  
Discharge Process ◽  
Capacity Retention ◽  
Specific Discharge ◽  
Charge Discharge

Core/shell-structured FeSn2/onion-like carbon (FeSn2/OLC) nanocapsules of confined size range of sub-50 nm are synthesized via an in-situ arc-discharge process, and are evaluated in comparison with FeSn2 nanoparticles as an improved stannide-based electrocatalytic anode material for Li-ion batteries (LIBs). The in-situ arc-discharge process allows a facile one-pot procedure for forming crystalline FeSn2 stannide alloy nanoparticle cores coated by defective OLC thin shells in addition to a confined crystal growth of the FeSn2 nanoparticle cores. The LIB cells assembled using the FeSn2/OLC nanocapsules as the electrocatalytic anodes exhibit superior full specific discharge capacity of 519 mAh·g−1 and specific discharge capacity retention of ~62.1% after 100 charge-discharge cycles at 50 mA·g−1 specific current. The electrochemical stability of FeSn2/OLC nanocapsules is demonstrated from the good cycle stability of the LIBs with a high specific discharge capacity retention of 67.5% on a drastic change in specific current from 4000 to 50 mA·g−1. A formation mechanism is proposed to describe the confined crystal growth of the FeSn2 nanoparticle cores and the formation of the FeSn2/OLC core/shell structure. The observed electrochemical performance enhancement is ascribed to the synergetic effects of the enabling of a reversible lithiation process during charge-discharge of the LIB cells by the FeSn2 nanoparticle cores as well as the protection of the FeSn2 nanoparticle cores from volume change-induced pulverization and solid electrolyte interphase-induced passivation by the OLC shells.

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