Electrochemically Reduced Ultra-high Mass Loading Three-Dimensional Carbon Nanofiber Network: A Reproducible and Stable Cell Voltage of 2.0 V and High Energy Density Symmetric Supercapacitor

Nanoscale ◽  
2021 ◽  
Author(s):  
Gunendra Prasad Ojha ◽  
Bishweshwar Pant ◽  
Jiwan Acharya ◽  
Mira Park
Keyword(s):  
Energy Density ◽  
Carbon Nanofiber ◽  
Three Dimensional ◽  
Cell Voltage ◽  
High Energy ◽  
Low Energy ◽  
High Energy Density ◽  
High Mass ◽  
Mass Loading ◽  
Symmetric Supercapacitor

Commercial supercapacitors need high mass loading of more than 10 mg cm-2 and a high working potential window to resolve the low energy density concern. Herein, we have demonstrated a...

scholarly journals 3D Printing of NiCoP/Ti3C2 MXene Architectures for Energy Storage Devices with High Areal and Volumetric Energy Density

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Lianghao Yu ◽  
Weiping Li ◽  
Chaohui Wei ◽  
Qifeng Yang ◽  
Yuanlong Shao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
3D Printing ◽  
High Energy ◽  
High Energy Density ◽  
High Mass ◽  
Mass Loading ◽  
Energy Storage Devices ◽  
Practical Applications ◽  
3D Printed

AbstractDesigning high-performance electrodes via 3D printing for advanced energy storage is appealing but remains challenging. In normal cases, light-weight carbonaceous materials harnessing excellent electrical conductivity have served as electrode candidates. However, they struggle with undermined areal and volumetric energy density of supercapacitor devices, thereby greatly impeding the practical applications. Herein, we demonstrate the in situ coupling of NiCoP bimetallic phosphide and Ti3C2 MXene to build up heavy NCPM electrodes affording tunable mass loading throughout 3D printing technology. The resolution of prints reaches 50 μm and the thickness of device electrodes is ca. 4 mm. Thus-printed electrode possessing robust open framework synergizes favorable capacitance of NiCoP and excellent conductivity of MXene, readily achieving a high areal and volumetric capacitance of 20 F cm−2 and 137 F cm−3 even at a high mass loading of ~ 46.3 mg cm−2. Accordingly, an asymmetric supercapacitor full cell assembled with 3D-printed NCPM as a positive electrode and 3D-printed activated carbon as a negative electrode harvests remarkable areal and volumetric energy density of 0.89 mWh cm−2 and 2.2 mWh cm−3, outperforming the most of state-of-the-art carbon-based supercapacitors. The present work is anticipated to offer a viable solution toward the customized construction of multifunctional architectures via 3D printing for high-energy-density energy storage systems.

scholarly journals Laser photonic-reduction stamping for graphene-based micro-supercapacitors ultrafast fabrication

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongjiu Yuan ◽  
Lan Jiang ◽  
Xin Li ◽  
Pei Zuo ◽  
Chenyang Xu ◽  
...  
Keyword(s):  
Energy Density ◽  
Three Dimensional ◽  
Single Pulse ◽  
Laser Pulses ◽  
High Energy ◽  
Small Time ◽  
Low Energy ◽  
High Energy Density ◽  
Dimensional Structure ◽  
Energy Storage Devices

AbstractMicro-supercapacitors are promising miniaturized energy storage devices that have attracted considerable research interest. However, their widespread use is limited by inefficient microfabrication technologies and their low energy density. Here, a flexible, designable micro-supercapacitor can be fabricated by a single pulse laser photonic-reduction stamping. A thousand spatially shaped laser pulses can be generated in one second, and over 30,000 micro-supercapacitors are produced within 10 minutes. The micro-supercapacitor and narrow gaps were dozens of microns and 500 nm, respectively. With the unique three-dimensional structure of laser-induced graphene based electrode, a single micro-supercapacitor exhibits an ultra-high energy density (0.23 Wh cm−3), an ultra-small time constant (0.01 ms), outstanding specific capacitance (128 mF cm−2 and 426.7 F cm−3) and a long-term cyclability. The unique technique is desirable for a broad range of applications, which surmounts current limitations of high-throughput fabrication and low energy density of micro-supercapacitors.

MoO2 Nanoparticles Confined in N, P-codoped Graphene Aerogels with Excellent Pseudocapacitance Performance

2020 ◽  
Author(s):  
Jianfa Chen ◽  
Tianxiang Jin ◽  
Hangchun Deng ◽  
Jie Huang ◽  
Guangyuan Ren ◽  
...  
Keyword(s):  
Energy Density ◽  
Synergistic Effect ◽  
Power Density ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Mass Loading ◽  
Cycle Stability ◽  
Graphene Aerogels ◽  
Symmetric Supercapacitor

In this work, MoO2@NPGA nanocomposites were successfully prepared via a simple hydrothermal and calcination route.The as-prepared MoO2@NPGA composites exhibit a synergistic effect between MoO2 and N, P codoped graphene aerogels, which can significantly improve the electrochemical performance of the MoO2@NPGA electrodes. Moreover, the results also proved that the mass loading of MoO2 has a huge effect on the electrochemical properties of MoO2@NPGA composites. With an appropriate amount of MoO2, the MoO2@NPGA composite shows a high specific capacitance (335 F g-1 at 1 A g-1) and excellent cycle stability (capacitance remains at 88% after 6000 cycles). Futhermore, the assembled symmetric supercapacitor displays a high energy density of 23.75 W h kg-1 at a power density of 300 W kg-1 and can maintain an energy density of 17.1 W h kg−1 when the power density reaches up to 6005 W kg−1.

A Perspective: Could Carbon Current Collectors Improve the Energy Density of Aqueous Alkaline Symmetric Supercapacitors?

2016 ◽  
Vol 3 (4) ◽  
Author(s):  
Hemesh Avireddy ◽  
Joan Ramon Morante ◽  
Cristina Flox
Keyword(s):  
Stainless Steel ◽  
Energy Density ◽  
Current Collector ◽  
Cell Voltage ◽  
High Energy ◽  
High Energy Density ◽  
Electrochemical Characteristics ◽  
Current Collectors ◽  
Collector System ◽  
Symmetric Supercapacitor

AbstractThe present discussion shows a perspective about using graphite as a current collector in order to achieve high energy density in a symmetric supercapacitor system. Several electrochemical modes (such as rest potential analysis, CV, PEIS, GCPL) were carried out to evaluate the electrochemical characteristics of graphite in aqueous 6 mol/L KOH. And, the resulting performance was compared to an another conventional current collector system based on nickel-stainless steel. Interestingly, widening of cell voltage was observed for graphite when compared to nickel-stainless steel. The discussion reveals the reasonable influences and validations of widening in cell voltage towards the values in energy densities. This perspective also highlights some issues related to carbon (graphite) current collectors and encloses with some promising strategies in overcoming these issues, not limiting the domain of application (either micro or macro supercapacitor devices).

Binder-free three-dimensional high energy density electrodes for ionic-liquid supercapacitors

2015 ◽  
Vol 51 (72) ◽  
pp. 13760-13763 ◽  
Author(s):  
Chau Tran ◽  
Daniel Lawrence ◽  
Francis W. Richey ◽  
Caitlin Dillard ◽  
Yossef A. Elabd ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
Porous Carbon ◽  
Room Temperature ◽  
Carbon Nanofiber ◽  
Three Dimensional ◽  
High Energy ◽  
High Energy Density ◽  
Porous Carbon Nanofiber ◽  
Binder Free

We demonstrate a facile methodology to fabricate binder-free porous carbon nanofiber electrodes for room temperature ionic-liquid supercapacitors.

Transportation: Fuel Energies

2017 ◽  
Author(s):  
Peter Rez
Keyword(s):  
Energy Density ◽  
Fossil Fuels ◽  
High Energy ◽  
Ease Of Use ◽  
Low Energy ◽  
High Energy Density ◽  
Nuclear Fuels ◽  
Liquid Hydrocarbons ◽  
Transportation Fuel ◽  
Journey Time

Transportation efficiency can be measured in terms of the energy needed to move a person or a tonne of freight over a given distance. For passengers, journey time is important, so an equally useful measure is the product of the energy used and the time taken for the journey. Transportation requires storage of energy. Rechargeable systems such as batteries have very low energy densities as compared to fossil fuels. The highest energy densities come from nuclear fuels, although, because of shielding requirements, these are not practical for most forms of transportation. Liquid hydrocarbons represent a nice compromise between high energy density and ease of use.

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