Mesoporous hollow carbons on graphene and their electrochemical properties

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73119-73125 ◽  
Author(s):  
G. H. Jeong ◽  
I. Lee ◽  
J.-G. Kang ◽  
H. Lee ◽  
S. Yoon ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrochemical Properties ◽  
Power Density ◽  
Supercapacitor Electrode ◽  
Graphene Surface ◽  
Hollow Carbon

We synthesized mesoporous hollow carbon on a graphene surface (MHCG). When applied into supercapacitor electrode, MHCG electrode exhibited outstanding maintenance of energy density above 30 W h kg−1 even under 1 kW kg−1 power density.

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 In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Gopal Krishna Gupta ◽  
Pinky Sagar ◽  
Sumit Kumar Pandey ◽  
Monika Srivastava ◽  
A. K. Singh ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Power Density ◽  
Supercapacitor Electrode ◽  
In Situ Fabrication ◽  
Transmission Electron ◽  
Good Energy ◽  
Supercapacitor Performance ◽  
Operating Potential

AbstractHerein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV–visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer–Emmett–Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g−1 in the potential window ranging from − 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg−1 and power density of ~ 277.92 W kg−1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.

α MnMoO4/graphene hybrid composite: high energy density supercapacitor electrode material

2014 ◽  
Vol 43 (28) ◽  
pp. 11067-11076 ◽  
Author(s):  
Debasis Ghosh ◽  
Soumen Giri ◽  
Md. Moniruzzaman ◽  
Tanya Basu ◽  
Manas Mandal ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Power ◽  
Electrode Material ◽  
Hybrid Composite ◽  
High Energy ◽  
High Energy Density ◽  
High Power Density ◽  
Supercapacitor Electrode

A hydrothermal procedure was employed to synthesize hexahedron shaped MnMoO4 wrapped with graphene exhibiting high energy density and high power density.

Flexible Mn-decorated NiCo2S4 core–shell nanowire arrays for a high performance hybrid supercapacitor electrode with a long cycle life

CrystEngComm ◽  
2018 ◽  
Vol 20 (33) ◽  
pp. 4735-4744 ◽  
Author(s):  
Chang Liu ◽  
Xiang Wu ◽  
Hui Xia
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Performance ◽  
Nanowire Arrays ◽  
Core Shell ◽  
Hybrid Supercapacitor ◽  
Supercapacitor Electrode ◽  
Long Cycle Life ◽  
Asymmetric Hybrid ◽  
Shell Nanowires

In this work, an asymmetric hybrid supercapacitor assembled by utilizing 0.5Mn–NiCo2S4 core–shell nanowires as the positive electrode achieves a relatively high volumetric energy density of 8.80 mW h cm−3 at a volumetric power density of 220.103 mW cm−3.

The porous ZnCo2O4 nanosheets arrays as a binder-free electrode for high performance flexible supercapacitor materials

2021 ◽  
Author(s):  
Jing Wang ◽  
Chen Wang ◽  
Shen Wang ◽  
Xiang Zhang ◽  
Xiangyang Jin ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Energy Storage Devices ◽  
Supercapacitor Electrode ◽  
Flexible Electrode ◽  
Flexible Supercapacitor ◽  
Binder Free

Abstract In this paper, the porous ZnCo2O4 nanosheets arrays (NAs)/carbon cloth (CC) were prepared for the first time as a binder-free anode by hydrothermal method. The anode electrode material shows multistage pore distribution and thus can provide numerous ways for the transport of ions and electrons. As a supercapacitor electrode, the flexible ZnCo2O4/CC electrode indicates a high specific capacitance (1790 F/g at the current density of 1 A/g), good rate performance, and excellent cycle properties (99.4% capacitance retention after 10000 cycles). Besides, the flexible electrode also displays good mechanical flexibility. The solid-state asymmetric flexible supercapacitor device was assembled taking the ZnCo2O4/CC electrode as the positive electrode and carbon nanotube (CNTs)/CC as the negative electrode. The asymmetric device delivers high energy density 47.1 Wh/Kg (power density 800 W/Kg) and power density 12000 W/Kg (energy density 28.3 Wh/Kg) with the potential window 0 V ~ 1.6 V. These results indicate the ZnCo2O4/CC flexible electrode with high electrochemical performance adjust for environmentally friendly and low-cost energy storage devices in the future.

scholarly journals Na0.76V6O15/Activated Carbon Hybrid Cathode for High-Performance Lithium-Ion Capacitors

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 122
Author(s):  
Renwei Lu ◽  
Xiaolong Ren ◽  
Chong Wang ◽  
Changzhen Zhan ◽  
Ding Nan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Power Density ◽  
Cathode Materials ◽  
Low Cost ◽  
Lithium Ion ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Artificial Graphite

Lithium-ion hybrid capacitors (LICs) are regarded as one of the most promising next generation energy storage devices. Commercial activated carbon materials with low cost and excellent cycling stability are widely used as cathode materials for LICs, however, their low energy density remains a significant challenge for the practical applications of LICs. Herein, Na0.76V6O15 nanobelts (NaVO) were prepared and combined with commercial activated carbon YP50D to form hybrid cathode materials. Credit to the synergism of its capacitive effect and diffusion-controlled faradaic effect, NaVO/C hybrid cathode displays both superior cyclability and enhanced capacity. LICs were assembled with the as-prepared NaVO/C hybrid cathode and artificial graphite anode which was pre-lithiated. Furthermore, 10-NaVO/C//AG LIC delivers a high energy density of 118.9 Wh kg−1 at a power density of 220.6 W kg−1 and retains 43.7 Wh kg−1 even at a high power density of 21,793.0 W kg−1. The LIC can also maintain long-term cycling stability with capacitance retention of approximately 70% after 5000 cycles at 1 A g−1. Accordingly, hybrid cathodes composed of commercial activated carbon and a small amount of high energy battery-type materials are expected to be a candidate for low-cost advanced LICs with both high energy density and power density.

New 3D Porous Silver Nanopolycluster as a Highly Effective Supercapacitor Electrode: Synthesis and Study of the Optical and Electrochemical Properties

2021 ◽  
Vol 60 (3) ◽  
pp. 1523-1532
Author(s):  
Qing-Shi Wu ◽  
Fahime Bigdeli ◽  
Farzaneh Rouhani ◽  
Xue-Mei Gao ◽  
Hamed Kaviani ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Supercapacitor Electrode ◽  
Highly Effective ◽  
Porous Silver

Ionophobic nanopore enhancing capacitance and charging dynamics in supercapacitor with ionic liquids

2021 ◽  
Author(s):  
Zhongdong Gan ◽  
Yanlei Wang ◽  
Mi Wang ◽  
Enlai Gao ◽  
Feng Huo ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Energy Density ◽  
Power Density ◽  
Porous Electrodes ◽  
Charging Dynamics

Nano-porous electrodes combined with ionic liquids (ILs) are widely favored to promote the energy density of supercapacitors. However, this is always accompanied by the reduced power density, especially considering the...

scholarly journals Novel Lithium-Ion Capacitor Based on a NiO-rGO Composite

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3586
Author(s):  
Qi An ◽  
Xingru Zhao ◽  
Shuangfu Suo ◽  
Yuzhu Bai
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Power Density ◽  
High Power ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Cycle Life ◽  
High Energy Density ◽  
Lithium Ion Capacitor

Lithium-ion capacitors (LICs) have been widely explored for energy storage. Nevertheless, achieving good energy density, satisfactory power density, and stable cycle life is still challenging. For this study, we fabricated a novel LIC with a NiO-rGO composite as a negative material and commercial activated carbon (AC) as a positive material for energy storage. The NiO-rGO//AC system utilizes NiO nanoparticles uniformly distributed in rGO to achieve a high specific capacity (with a current density of 0.5 A g−1 and a charge capacity of 945.8 mA h g−1) and uses AC to provide a large specific surface area and adjustable pore structure, thereby achieving excellent electrochemical performance. In detail, the NiO-rGO//AC system (with a mass ratio of 1:3) can achieve a high energy density (98.15 W h kg−1), a high power density (10.94 kW kg−1), and a long cycle life (with 72.1% capacity retention after 10,000 cycles). This study outlines a new option for the manufacture of LIC devices that feature both high energy and high power densities.

The influences of operating conditions and design configurations on the performance of symmetric electrochemical capacitors

2016 ◽  
Vol 18 (41) ◽  
pp. 28626-28647 ◽  
Author(s):  
Innocent S. Ike ◽  
Iakovos Sigalas ◽  
Sunny E. Iyuke
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Electrochemical Capacitors ◽  
Electrochemical Capacitor ◽  
Operating Conditions ◽  
Modelling And Simulation ◽  
Charging Current ◽  
Current Densities

The influence of different charging current densities, charging times and several structural designs on symmetric electrochemical capacitor (EC) performance, including capacitance, energy density and power density, has been investigated via modelling and simulation.

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