scholarly journals Electrochemical properties of an activated carbon xerogel monolith from resorcinol–formaldehyde for supercapacitor electrode applications

RSC Advances ◽  
2021 ◽  
Vol 11 (53) ◽  
pp. 33192-33201
Author(s):  
Minhu Huang ◽  
Seung Joon Yoo ◽  
Jae-Suk Lee ◽  
Tae-Ho Yoon
Keyword(s):  
Activated Carbon ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Carbon Xerogel ◽  
Supercapacitor Electrode ◽  
Resorcinol Formaldehyde

A monolithic carbon xerogel electrode for supercapacitors was prepared from resorcinol–formaldehyde, providing a specific capacitance of 323 F g−1via GCD at 1 A g−1 and 100% retention upon 5000 cycling tests.

scholarly journals Electrochemical properties of kenaf-based activated carbon monolith for supercapacitor electrode applications

RSC Advances ◽  
2021 ◽  
Vol 11 (61) ◽  
pp. 38515-38522
Author(s):  
Han Yul Park ◽  
Minhu Huang ◽  
Tae-Ho Yoon ◽  
Kyung Hun Song
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Power Density ◽  
Supercapacitor Electrode ◽  
Cycling Test ◽  
Carbon Monolith ◽  
Activated Carbon Monolith

Monolithic carbon from kenaf-based fiber for supercapacitor electrode application provided a specific capacitance of 212 F g−1via GCD at 1 A g−1, converting to an energy density of 6 W h kg−1 at the power density of 215 W kg−1 as well as 95.9% retention upon 5000 cycling test.

scholarly journals N, S-Codoped Activated Carbon Material with Ultra-High Surface Area for High-Performance Supercapacitors

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1982
Author(s):  
Qinghua Yuan ◽  
Zhuwen Ma ◽  
Junbiao Chen ◽  
Zhenrui Huang ◽  
Zeming Fang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
High Surface ◽  
Koh Activation ◽  
Supercapacitor Electrode ◽  
Tobacco Stalk

The recycling of macromolecular biowastes has been a problem for the agriculture industry. In this study, a novel N, S-codoped activated carbon material with an ultrahigh specific area was produced for the application of a supercapacitor electrode, using tobacco stalk biowastes as the carbon source, KOH as the activating agents and thiourea as the doping agent. Tobacco stalk is mainly composed of cellulose, but also contains many small molecules and inorganic salts. KOH activation resulted in many mesopores, giving the tobacco stem-activated carbon a large specific surface area and double-layer capacitance. The specific surface area of the samples reached up to 3733 m2·g−1, while the maximum specific capacitance of the samples obtained was up to 281.3 F·g−1 in the 3-electrode tests (1 A·g−1). The doping of N and S elements raised the specific capacitance significantly, which could be increased to a value as high as 422.5 F·g−1 at a current density of 1 A·g−1 in the 3-electrode tests, but N, S-codoping also led to instability. The results of this article prove that tobacco stalks could be efficiently reused in the field of supercapacitors.

Graphene-NiO Composite Electrode for Supercapacitors

2011 ◽  
Vol 345 ◽  
pp. 75-78 ◽  
Author(s):  
Wei Zhou ◽  
Man Lin Tan ◽  
Xiao Song Zhou
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Graphene Sheets ◽  
Supercapacitor Electrode ◽  
Scan Rate

In this paper, a facilesolution method was employed to synthesize the graphene-NiO composite. SEM and XRD results indicated the graphene sheets were covered by the NiO nanoplates. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to measure the electrochemical properties of the composite. The specific capacitance reached 1292F/g at a scan rate of 5mV/s. The results show that this composite is a promising material for supercapacitor electrode.

scholarly journals Research on the High-Performance Electrochemical Energy Storage of a NiO@ZnO (NZO) Hybrid Based on Growth Time

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 47 ◽  
Author(s):  
Jiahong Zheng ◽  
Runmei Zhang ◽  
Kangkang Cheng ◽  
Ziqi Xu ◽  
Pengfei Yu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
High Performance ◽  
Reaction Times ◽  
Electrochemical Energy Storage ◽  
Growth Time ◽  
Hydrothermal Time ◽  
Supercapacitor Electrode ◽  
Negative Electrodes ◽  
Promising Electrode Material

A NiO@ZnO (NZO) hybrid with different reaction times was successfully synthesized by a green hydrothermal method. After comparison, it was found that hydrothermal time had a great impact on specific capacitance. As a supercapacitor electrode of NZO-12h, it exhibited the maximum reversible specific capacitance of 985.0 F/g (3.94 F/cm2) at 5 mA/cm2 and 587.5 F/g (2.35 F/cm2) at 50 mA/cm2, as well as a high retention of 74.9% capacitance after 1500 cycles at 20 mA/cm2. Furthermore, the asymmetric electrode device with ZnO-12h and activated carbon (AC) as the positive and negative electrodes was successfully assembled. In addition, the device exhibited a specific capacitance of 85.7 F/g at 0.4 A/g. Moreover, the highest energy density of 27.13 Wh kg−1 was obtained at a power density of 321.42 W kg−1. These desirable electrochemical properties demonstrate that the NZO hybrid is a promising electrode material for a supercapacitor.

Activated Carbon/MnO2 Composites as Electrode for High Performance Supercapacitors

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 256 ◽  
Author(s):  
Jang Rak Choi ◽  
Ji Won Lee ◽  
Guijun Yang ◽  
Young-Jung Heo ◽  
Soo-Jin Park
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Carbon Material ◽  
High Performance ◽  
Cycle Performance ◽  
Stable Cycle ◽  
Hydrothermal Approach

Activated carbon (AC) was synthesized with various weight ratios of manganese dioxide (MO) through a simple hydrothermal approach. The electrochemical performance of the synthesized activated carbon/MnO2 composites was investigated. The effect of the activated carbon/MnO2 (AM) ratio on the electrochemical properties of the activated carbon/MnO2 composites and the pore structure was also examined. The results show that the specific capacitance of the activated carbon material has been improved after the addition of MO. The as-synthesized composite material exhibits specific capacitance of 60.3 F g−1 at 1 A g−1, as well as stable cycle performance and 99.6% capacitance retention over 5000 cycles.

scholarly journals Study of The Variation of Activating Agents on Specific Capacitance Values on The Synthesis of Supercapacitor Electrodes Based on Pepper Peel Waste

2021 ◽  
Vol 9 (1) ◽  
pp. 19
Author(s):  
Widodo Budi Kurniawan ◽  
Anisa Indriawati ◽  
Siska Oktaviani
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Gas Flow ◽  
Base Material ◽  
Physical Activation ◽  
Test Results ◽  
Negative Effects ◽  
Supercapacitor Electrode ◽  
Initial Stage ◽  
Porous Morphology

The by-product of pepper production in Bangka Belitung is the waste of pepper skin. This waste tends to be untapped and thrown away so that it can disrupt the environmental ecosystem. One of the efforts to utilize pepper skin waste is processing it into activated carbon as the base material for supercapacitor electrodes. The initial stage of the synthesis was carried out by a pre-carbonization process on a sample of dry and clean pepper peel waste. Furthermore, the sample is chemically activated using a chemical activator and also physical activation at a temperature of 700ºC in N2 gas flow conditions. The activated carbon resulting from the activation is then molded into electrode plates in the form of pellets with a diameter of 1 cm. The electrode plates were characterized using a scanning electron microscope-energy dispersive x-ray (SEM-EDX) to determine morphology and cyclic voltammetry (CV) to determine the specific capacitance value. SEM test results show that the electrode sample has porous morphology and CV results show that the sample activated using the KOH activator has a specific capacitance value of 15.20 F/g. These results indicate that the activated carbon synthesized from the waste of pepper peel can be used as a supercapacitor electrode material and also a solution for overcoming the negative effects of pepper skin waste.

scholarly journals A Review on Synthesis and Characterization of Activated Carbon from Natural Fibers for Supercapacitor Application

2022 ◽  
Vol 30 (1) ◽  
pp. 351-376
Author(s):  
Thilageshwaran Subramaniam ◽  
Mohamed Ansari Mohamed Nainar ◽  
Noor Afeefah Nordin
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Natural Fiber ◽  
Natural Fibers ◽  
High Specific Capacitance ◽  
Electrochemical Characteristics ◽  
Supercapacitor Electrode ◽  
Supercapacitor Application ◽  
Long Cycle Life

Supercapacitors have gained much attention in recent years due to their promising characteristics, such as high specific capacitance, high power density, long cycle life, and environment-friendly nature. Usage of natural sources for activated carbon synthesis is a major focus by many researchers worldwide for discovering a replacement of existing supercapacitors. This review summarizes the methods used to synthesize activated carbon (AC) from various natural fiber, their physical and electrochemical characteristics, and the improvement of supercapacitor electrode performance. Previous research studies indicate the practicability of activated carbon derived from various natural fibers with superior electrochemical properties. The effect of activating reagents and temperature on the electrochemical performance for supercapacitor applications are also highlighted in this paper. Since the nature of activated carbon from fibers and its synthesizing methods would result in different properties, the Cyclic Voltammetry (CV) study is also thoroughly discussed on the specific capacitance together with charge/discharge test to observe the capacitance retention after several cycles. Finally, a detailed approach of converting biowaste materials to activated carbon for energy storage applications with environmental concerns is explored.

Facile Preparation of Activated Carbon/Zinc Oxide Nanocomposite for Supercapacitor Application

2020 ◽  
Vol 13 (3) ◽  
pp. 223-231
Author(s):  
Nurul Infaza Talalah Ramli ◽  
Hartini Ahmad Rafaie ◽  
Muhd Firdaus Kasim ◽  
Hanifa Binti Ibno
Keyword(s):  
Zinc Oxide ◽  
Activated Carbon ◽  
Specific Capacitance ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Supercapacitor Electrode ◽  
Supercapacitor Application ◽  
Preparation Route ◽  
Facile Preparation ◽  
The Individual

Objective: An efficient and facile preparation route has been developed to prepare activated carbon (AC)/zinc oxide (ZnO) nanocomposite electrodes for the supercapacitor electrode. Methods: The zinc oxide nanostructure was synthesized via the sol-gel method by using conventional hexamethylenetetramine (HMTA) reagent as the reducing agent. Results: The physicochemical and electrochemical properties of the nanocomposites were characterized by X-ray diffraction analysis (XRD) and cyclic voltammetry (CV) analysis, respectively. 10 wt% of ZnO loading shows an optimum specific capacitance of 398 F/g at a scan rate of 50 mV/s. The optimum sample retained 96% of its initial specific capacitance upon 100 consecutive cycles. Conclusion: The enhanced specific capacitance can be ascribed to the synergistic effect of the individual properties of AC and ZnO.

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