scholarly journals Synthesis of Benzoxazine-Based N-Doped Mesoporous Carbons as High-Performance Electrode Materials

2020 ◽  
Vol 10 (1) ◽  
pp. 422
Author(s):  
Haihan Zhang ◽  
Li Xu ◽  
Guoji Liu
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Retention Rate ◽  
High Specific Capacitance ◽  
Mesoporous Structure ◽  
Electrode System ◽  
Excellent Electrochemical Performance ◽  
Nitrogen Doped Carbon

In this work, nitrogen-doped carbon materials (NCMs) were prepared using aniline-phenol benzoxazine (BOZ) or aniline-cardanol benzoxazine as the carbon precursor and SBA-15 as the hard template. The effects of the carbonization temperature (700, 800, and 900 °C) and different nitrogen contents on the electrochemical properties of carbon materials were investigated. The samples synthesized using aniline-phenol benzoxazine as precursors and treated at 900 °C (NCM-900) exhibited an excellent electrochemical performance. The specific capacitance was 460 F/g at a current density of 0.25 A/g and the cycle stability was excellent (96.1% retention rate of the initial capacitance after 2000 cycles) in a 0.5 M H2SO4 electrolyte with a three-electrode system. Furthermore, NCM-900 also exhibited a high specific capacitance, comparable energy/power densities, and excellent cycling stability using a symmetrical electrode system. The characterization of the morphology and structure of the materials suggests it possessed an ordered mesoporous structure and a large specific surface area. NCM-900 could thus be considered a promising electrode material for supercapacitors.

scholarly journals Highly Effective Self-Propagating Synthesis of Lamellar ZnO-Decorated MnO2 Nanocrystals with Improved Supercapacitive Performance

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1680
Author(s):  
Luming Li ◽  
Jing Li ◽  
Hongmei Li ◽  
Li Lan ◽  
Jie Deng
Keyword(s):  
Electrical Conductivity ◽  
Specific Capacitance ◽  
Doping Level ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Electrode System ◽  
Constant Current ◽  
Supercapacitive Performance ◽  
Zno Doping

A series of MOx (M = Co, Ni, Zn, Ce)-modified lamellar MnO2 electrode materials were controllably synthesized with a superfast self-propagating technology and their electrochemical practicability was evaluated using a three-electrode system. The results demonstrated that the specific capacitance varied with the heteroatom type as well as the doping level. The low ZnO doping level was more beneficial for improving electrical conductivity and structural stability, and Mn10Zn hybrid nanocrystals exhibited a high specific capacitance of 175.3 F·g−1 and capacitance retention of 96.9% after 2000 cycles at constant current of 0.2 A·g−1. Moreover, XRD, SEM, and XPS characterizations confirmed that a small part of the heteroatoms entered the framework to cause lattice distortion of MnO2, while the rest dispersed uniformly on the surface of the carrier to form an interfacial collaborative effect. All of them induced enhanced electrical conductivity and electrochemical properties. Thus, the current work provides an ultrafast route for development of high-performance pseudocapacitive energy storage nanomaterials.

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 Sol-gel synthesis and electrochemical performance of NiCo2O4 nanoparticles for supercapacitor applications

2019 ◽  
Vol 9 (4) ◽  
pp. 243-253
Author(s):  
Yong Zhang ◽  
Yi Ru ◽  
Hai-Li Gao ◽  
Shi-Wen Wang ◽  
Ji Yan ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Retention Rate ◽  
Sol Gel ◽  
High Specific Capacitance ◽  
Supercapacitor Electrode ◽  
Electrochemical Tests ◽  
Potential Electrode ◽  
Current Densities

In this work, NiCo2O4 nanoparticles with enhanced supercapacitive performance have been successfully synthesized via a facile sol-gel method and subsequent calcination in air. The morphology and composition of as-prepared samples were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray dif­fraction (XRD), and Raman spectroscopy (Raman). The electrochemical per­formances of NiCo2O4 nanoparticles as supercapacitor electrode materials were evalu­ated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) tests in 3 mol L-1 KOH aqueous solution. The results show that as-prepared NiCo2O4 nanoparticles have diameters of about 20-30 nm with uniform distribution. There are some interspaces between nanoparticles observed, which could increase the effective contact area with the electrolyte and provide fast path for the insertion and extraction of electrolyte ions. The electrochemical tests show that the prepared NiCo2O4 nanoparticles for supercapacitors exhibit excellent electrochemical performance with high specific capacitance and good cycle stability. The specific capacitance of NiCo2O4 electrode has been found as high as 1080, 800, 651, and 574 F g-1 at current densities of 1, 4, 7, and 10 A g-1, respectively. Notably, the capacitance retention rate (compared with 1 A g-1) is up to 74.1 %, 60.3 %, and 53.1 % at current densities of 4, 7, and 10 A g-1, respectively. After 100 cycles, higher capacitance retention rate is also achieved. Therefore, the results indicate that NiCo2O4 material is the potential electrode material for 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.

Effect of Reaction Time on the Performance of Co3O4 Electrode Materials for High Performance Supercapacitors

2020 ◽  
Vol 15 (12) ◽  
pp. 1429-1435
Author(s):  
Yan Zhao ◽  
Yucai Li ◽  
Dong Zhang ◽  
Shiwei Song ◽  
Jian Wang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Electrochemical Performance ◽  
Current Density ◽  
High Performance ◽  
Electrode Materials ◽  
Structural Characteristics ◽  
High Specific Capacitance ◽  
High Porosity ◽  
Excellent Electrochemical Performance ◽  
Hydrothermal Approach

Electrochemical performance of the material depends on the morphology and structural characteristics of the material. Co3O4 samples shows the remarkable electrochemical performance owing to the high porosity, appropriate pore size distribution and novel architecture and reaction time effect of morphology. In this work, Co3O4 nanowires grown on Ni foam have been synthesized through a facile hydrothermal approach, revealing large capacitance of 2178.4 mF cm-2 at the current density of 2 mA cm-2 and cycling stability with 79.6% capacitance retention after 6000 cycles. The as-assembled device delivers excellent electrochemical performance for high specific capacitance of 356 mF cm-2 at the current density of 2 mA cm-2 and high cycle stability.

Orderly Arranged Bead-Chain Cu2O-Mn3O4-NiO Ternary Nanocomposites with High Specific Capacitance for Supercapacitors

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050082
Author(s):  
Lei Su ◽  
Chunyong Zhang ◽  
Li Shu ◽  
Linna Huang ◽  
Jianning Li ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Electrochemical Tests ◽  
Excellent Electrochemical Performance ◽  
Oxide Particles

A series of metal oxide nanocomposites have been successfully synthesized by electrospinning technology. The obtained nanocomposites (Cu2O-Mn3O4-NiO) are an ordered arrangement of metal oxide particles (10[Formula: see text]nm), with the shape like bead chain. The acquired Cu2O-Mn3O4-NiO ternary nanocomposites were used as electrode materials to manufacture a supercapacitor. Electrochemical tests showed that the synthesis of nanocomposites made of electrode materials had good electrochemical performance in 6[Formula: see text]mol/L KOH electrolyte. The results showed that at a scan rate of 5[Formula: see text]mV/s, the specific capacitance of Cu2O-Mn3O4-NiO had a larger specific capacitance of 1306[Formula: see text]F/g than NiO, Cu2O-NiO and Mn3O4-NiO. The excellent electrochemical performance showed that the electrostatic spinning method is an effective technology for developing nanocomposites for energy storage devices.

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.

Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications

Holzforschung ◽  
2020 ◽  
Vol 74 (5) ◽  
pp. 529-538
Author(s):  
Honglei Chen ◽  
Lei Sha ◽  
Yujie Zhang ◽  
Shoujuan Wang ◽  
Fangong Kong ◽  
...  
Keyword(s):  
Porous Structure ◽  
High Performance ◽  
High Specific Capacitance ◽  
Hierarchical Porous Structure ◽  
Nitrogen Doped ◽  
Excellent Electrochemical Performance ◽  
Hierarchical Porous ◽  
Nitrogen Doped Carbon ◽  
Performance Rate

AbstractEchinus-like nitrogen-doped carbon with a hierarchical porous structure was synthesized from green larch waste and urea via liquid in situ doping and high-temperature carbonization. Benefitting from a large specific surface area (649 m2 g−1) and hierarchical porous structure, the nitrogen-doped carbon exhibited excellent electrochemical performance for supercapacitors. Remarkably, the echinus-like nitrogen-doped carbon achieved a high specific capacitance of 340 F g−1 at a current density of 1 A g−1 in 6 M KOH electrolyte as well as a good performance rate and stability (with a capacitance retention of 98% after 5000 cycles). This capacitance was almost 1.5 times higher than that of undoped carbon due to the contribution of the pseudocapacitance from the nitrogen doping. Larch sawdust is a promising carbon source for fabricating inexpensive, sustainable and high-performance supercapacitor materials.

Core–shell structural PANI-derived carbon@Co–Ni LDH electrode for high-performance asymmetric supercapacitors

2018 ◽  
Vol 2 (6) ◽  
pp. 1350-1355 ◽  
Author(s):  
Junming Cao ◽  
La Li ◽  
Yunlong Xi ◽  
Junzhi Li ◽  
Xuexue Pan ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Specific Capacitance ◽  
Double Layer ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Core Shell ◽  
Asymmetric Supercapacitors ◽  
Double Layer Capacitor ◽  
Metal Nanocomposites

Carbon/metal nanocomposites have been considered promising electrode materials for application in supercapacitors owing to their combination of good electrical conductivity, excellent cycle stabilities of the electronic double layer capacitor (EDLC) and high specific capacitance of the pseudocapacitor.

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.

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