Hierarchical Dendritic Polypyrrole with High Specific Capacitance for High-performance Supercapacitor Electrode Materials

2017 ◽  
Vol 20 (4) ◽  
pp. 197-204
Author(s):  
Weiliang Chen ◽  
Shuhua Pang ◽  
Zheng Liu ◽  
Zhewei Yang ◽  
Xin Fan ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Chemical Oxidation ◽  
Channel Structure ◽  
Supercapacitor Electrode ◽  
Infrared Spectrometer ◽  
A Current

Polypyrrole with hierarchical dendritic structures assembled with cauliflower-like structure of nanospheres, was synthesized by chemical oxidation polymerization. The structure of polyryrrole was characterized by Fourier transform infrared spectrometer and scanning electron microscopy. The electrochemical performance was performed on CHI660 electrochemical workstation. The results show that oxalic acid has a significant effect on morphology of PPy products. The hierarchical dendritic PPyOA(3) electrodes possess a large specific capacitance as high as 744 F/g at a current density of 0.2 A/g and could achieve a higher specific capacitance of 362 F/g even at a current density of 5.0 A/g. Moreover, the dendritic PPy products produce a large surface area on the electrode through the formation of the channel structure with their assembled cauliflower-like morphology, which facilitates the charge/electron transfer relative to the spherical PPy electrode. The spherical dendritic PPyOA(3) electrode has 58% retention of initial specific capacitance after 260 cycles. The as-prepared dendritic polypyrrole with high performance is a promsing electrode material for supercapacitor.

scholarly journals Nickel Cobalt Hydroxides With Tunable Thin-layer Nanosheets for High-performance Supercapacitor Electrode

2021 ◽  
Author(s):  
Luomeng Zhang ◽  
Hui Xia ◽  
Shaobo Liu ◽  
Yishan Zhou ◽  
Yuefeng Zhao ◽  
...  
Keyword(s):  
Thin Layer ◽  
Specific Capacitance ◽  
Current Density ◽  
Layered Double Hydroxides ◽  
High Performance ◽  
Electrode Materials ◽  
Supercapacitor Electrode ◽  
Nickel Cobalt ◽  
Capacitance Performance ◽  
Double Hydroxides

Abstract Layered double hydroxides as typical supercapacitor electrode materials can perform superior energy storage if the structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to synthesize the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility of NiCo-LDHs, adjust the thickness of materials and optimize the internal pore structures, thereby enhancing the capacitance performance of NiCo-LDHs. When the content of urea is reduced from 0.03 g to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheets structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g-1 under the current density of 1 A g-1, and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g-1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g-1 at 1 A g-1 and the capacitance retention with 78% over 1000 cycles. As a result, it offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

Nanocomposite Sheets Composed of Polyaniline Nanoparticles and Graphene Oxide as Electrode Materials for High-performance Supercapacitor

2018 ◽  
Vol 21 (2) ◽  
pp. 097-102
Author(s):  
Shuhua Pang ◽  
Weiliang Chen ◽  
Zhewei Yang ◽  
Zheng Liu ◽  
Xin Fan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
Monomer Concentration ◽  
High Specific Capacitance ◽  
Chemical Oxidation ◽  
Aniline Monomer ◽  
Chemical Oxidation Polymerization ◽  
Fast Ion

Composite materials based on the combination of graphene oxide and PANI are expected not only to improve the PANI conductivity, but also relieve graphene oxide aggregation via a synergistic effect. We report an easy synthesis of a polyaniline/graphene oxide (PGO) composite with a relatively high specific capacitance by chemical oxidation polymerization. As the employ of phytic acid and increasing aniline monomer concentration, more and more PANI nanoparticles deposited into the interval between GO layers. PGO3 composite exhibits the largest specific capacitance (349 F·g-1) and PGO4 composite follows (314 F·g-1), whereas PGO has a minimal specific capacitance (206 F·g-1). The enhanced capacitance originates from the high capacitance of more PANI nanoparticles and better configuration as well as higher surface area of PGO3 and PGO4 composites for fast ion transport. The as-prepared PGO3 sheets composite with improved electrochemical performance is a promising electrode material for supercapacitor.

scholarly journals Preparation of Porous Activated Carbons for High Performance Supercapacitors from Taixi Anthracite by Multi-Stage Activation

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3588 ◽  
Author(s):  
Xiao-Ming Yue ◽  
Zhao-Yang An ◽  
Mei Ye ◽  
Zi-Jing Liu ◽  
Cui-Cui Xiao ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Electrode Materials ◽  
Activated Carbons ◽  
High Rank ◽  
Cycle Performance ◽  
Electrochemical Performances ◽  
Multi Stage ◽  
A Current

Coal-based porous materials for supercapacitors were successfully prepared using Taixi anthracite (TXA) by multi-stage activation. The characterization and electrochemical tests of activated carbons (ACs) prepared in different stages demonstrated that the AC from the third-stage activation (ACIII) shows good porous structures and excellent electrochemical performances. ACIII exhibited a fine specific capacitance of 199 F g−1 at a current density of 1 A g−1 in the three-electrode system, with 6 mol L−1 KOH as the electrolyte. The specific capacitance of ACIII remained 190 F g−1 even despite increasing the current density to 5 A g−1, indicating a good rate of electrochemical performance. Moreover, its specific capacitance remained at 98.1% of the initial value after 5000 galvanostatic charge-discharge (GCD) cycle tests at a current density of 1 A g−1, suggesting that the ACIII has excellent cycle performance as electrode materials for supercapacitors. This study provides a promising approach for fabricating high performance electrode materials from high-rank coals, which could facilitate efficient and clean utilization of high-rank coals.

scholarly journals Nanoflower Ni(OH)2 grown in situ on Ni foam for high-performance supercapacitor electrode materials

2021 ◽  
Vol 5 (20) ◽  
pp. 5236-5246
Author(s):  
Xuerui Yi ◽  
Huapeng Sun ◽  
Neil Robertson ◽  
Caroline Kirk
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Ni Foam ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials

Nanoflower Ni(OH)2 shows exceptionally high specific capacitance.

Rationally designed nanosheet-based CoMoO4–NiMoO4 nanotubes for high-performance electrochemical electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10520-10526 ◽  
Author(s):  
Qing Yang ◽  
Shuang-Yan Lin
Keyword(s):  
Specific Capacitance ◽  
Hydrothermal Treatment ◽  
Current Density ◽  
High Performance ◽  
High Specific Capacitance ◽  
Electrochemical Electrodes ◽  
Ultrathin Nanosheet ◽  
A Current

Ultrathin nanosheet-based CoMoO4–NiMoO4 nanotubes were designed and synthesized by a hydrothermal treatment, which demonstrated a high specific capacitance of 751 F g−1 at a current density of 1 A g−1 and the excellent cycling ability.

Synthesis of vertical aligned TiO2@polyaniline core–shell nanorods for high-performance supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 1680-1683 ◽  
Author(s):  
Li Zhang ◽  
Lei Chen ◽  
Bin Qi ◽  
Guocheng Yang ◽  
Jian Gong
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
High Specific Capacitance ◽  
Core Shell ◽  
Simple Method ◽  
Polyaniline Nanorods ◽  
A Current

Ordered TiO2@polyaniline nanorods exhibiting high specific capacitance were prepared by a simple method. The specific capacitance retention of the product is over 85% after 1000 charge and discharge cycles at a current density of 10 A g−1.

scholarly journals Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Luomeng Zhang ◽  
Hui Xia ◽  
Shaobo Liu ◽  
Yishan Zhou ◽  
Yuefeng Zhao ◽  
...  
Keyword(s):  
Thin Layer ◽  
Specific Capacitance ◽  
Current Density ◽  
Layered Double Hydroxides ◽  
High Performance ◽  
Electrode Materials ◽  
Supercapacitor Electrode ◽  
Nickel Cobalt ◽  
Capacitance Performance ◽  
Double Hydroxides

AbstractLayered double hydroxides as typical supercapacitor electrode materials can exhibit superior energy storage performance if their structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel–cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to regulate the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility, adjust the thickness and optimize the internal pore structures of NiCo-LDHs, thereby enhancing their capacitance performance. When the content of urea is reduced from 0.03 to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheet structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g−1 under the current density of 1 A g−1 and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g−1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g−1 at 1 A g−1 with the capacitance retention of 78% over 1000 cycles. The current work offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

Making Waste Profitable: Yak Dung Derived Carbon for High-Performance Supercapacitors

NANO ◽  
2021 ◽  
pp. 2150087
Author(s):  
Mao Hu ◽  
Jia Xu ◽  
Ru Cheng ◽  
Wencai Bai ◽  
Chenghu Liang ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
Poultry Manure ◽  
High Specific Capacitance ◽  
Cost Effective ◽  
Supercapacitor Electrode ◽  
Continuous Increase ◽  
Capacitance Performance ◽  
Yak Dung

With the continuous increase in the demand for energy storage equipment, it is imperative to develop new electrode materials with high specific capacitance. In this study, yak dung derived carbon materials (N-YD) were prepared by a simple, economical, and effective method, and it was applied as a supercapacitor electrode material. The N-YD-800 material exhibited high nitrogen content, as well as a large number of multipore structures, which were beneficial to improve the capacitance performance. N-YD-800 exhibited an excellent specific capacitance (346.3[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], good rate performance (56.6% from 0.5[Formula: see text]A[Formula: see text]g[Formula: see text] to 10[Formula: see text]A[Formula: see text]g[Formula: see text], and excellent cycling stability (93.3% after 5000 cycles). This study provided a new method for the treatment of livestock and poultry manure resources, affording a cost-effective, easy-to-use carbon source to solve the problem of nonrenewable energy.

Design and synthesis of hierarchical NiCo2S4@NiMoO4core/shell nanospheres for high-performance supercapacitors

2015 ◽  
Vol 39 (11) ◽  
pp. 8430-8438 ◽  
Author(s):  
Mingming Yao ◽  
Zhonghua Hu ◽  
Yafei Liu ◽  
Peipei Liu
Keyword(s):  
Specific Capacitance ◽  
Hydrothermal Method ◽  
Current Density ◽  
Electrode Material ◽  
High Performance ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Core Shell ◽  
Design And Synthesis ◽  
A Current

A novel electrode material of three-dimensional hierarchical NiCo2S4@NiMoO4core/shell nanospheres was synthesized by a facile two-step hydrothermal method. These hierarchical NiCo2S4@NiMoO4core/shell nanospheres exhibit a high specific capacitance of 1714 F g−1at a current density of 1 A g−1, which indicated the excellent electrochemistry performance.

Hybrid MnO2@NiCo2O4 nanosheets for high performance asymmetric supercapacitors

2018 ◽  
Vol 5 (6) ◽  
pp. 1378-1385 ◽  
Author(s):  
Depeng Zhao ◽  
Xiang Wu ◽  
Chuanfei Guo
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
High Specific Capacitance ◽  
Ni Foam ◽  
Asymmetric Supercapacitors ◽  
Hydrothermal Approach ◽  
Nico2o4 Nanosheets ◽  
A Current

In this work, hybrid MnO2@NiCo2O4 nanosheets grown on Ni foam have been synthesized through a facile hydrothermal approach. The MnO2@NiCo2O4 electrode delivers a high specific capacitance of 3086 mF cm−2 at a current density of 2 mA cm−2.

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