Graphene-wrapped and cobalt oxide-intercalated hybrid for extremely durable super-capacitor with ultrahigh energy and power densities

Carbon ◽  
2014 ◽  
Vol 79 ◽  
pp. 192-202 ◽  
Author(s):  
Rajesh Kumar ◽  
Hyun-Jun Kim ◽  
Sungjin Park ◽  
Anchal Srivastava ◽  
Il-Kwon Oh
Keyword(s):  
Cobalt Oxide ◽  
Ultrahigh Energy ◽  
Super Capacitor ◽  
Power Densities

Optimized Kinetics Match and Charge Balance Toward Potassium Ion Hybrid Capacitors with Ultrahigh Energy and Power Densities

Small ◽  
2020 ◽  
Vol 16 (42) ◽  
pp. 2003724
Author(s):  
Yufan Peng ◽  
Rui Zhang ◽  
Binbin Fan ◽  
Weijian Li ◽  
Zhen Chen ◽  
...  
Keyword(s):  
Potassium Ion ◽  
Ultrahigh Energy ◽  
Charge Balance ◽  
Power Densities ◽  
Hybrid Capacitors

Phoretic Deposition of Graphene on Manganese-Cobalt Oxide Composites for Supercapacitor Electrodes

2012 ◽  
Vol 77 ◽  
pp. 302-306 ◽  
Author(s):  
Daniel H. Gutierrez ◽  
John Lake ◽  
Cristina Javier ◽  
Arthur Cheng ◽  
Zuki Tanaka ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Cobalt Oxide ◽  
High Power ◽  
Composite Electrode ◽  
Deposition Process ◽  
Thermal Reduction ◽  
Layered Composite ◽  
Supercapacitor Electrode ◽  
Novel Approach ◽  
Power Densities

Great focus has been directed towards double-layer capacitance and Faradic, redox reactions because of their long device lifetimes and their high power densities, respectively. Our novel approach to combining these mechanisms in a tri-layered composite electrode promises to increase the energy densities of the device, without sacrificing the supercapacitance and the high power densities attributed with it. Initial analysis of the interfacial interactions of graphene oxide (GO) and manganese oxide (MnO2) were promising. This paper aims to further demonstrate the tri-layered composite by forming a layer of reduced graphene oxide (rGO) on MnO2 nanowires and cobalt oxide nanorods. We have successfully created the first of a kind supercapacitor electrode material as a scalable device. In this paper, in addition to analysis of the composite electrode, we present modifications to the traditional electrophoretic deposition process and optimizations to the thermal reduction of GO in order to create rGO surfaces on substrates that are normally difficult to adhere it to.

Ultrahigh–energy density lead-free dielectric films via polymorphic nanodomain design

Science ◽  
2019 ◽  
Vol 365 (6453) ◽  
pp. 578-582 ◽  
Author(s):  
Hao Pan ◽  
Fei Li ◽  
Yao Liu ◽  
Qinghua Zhang ◽  
Meng Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Functional Materials ◽  
High Energy ◽  
High Energy Density ◽  
Lead Free ◽  
Dielectric Films ◽  
Electronic Systems ◽  
Ultrahigh Energy ◽  
Power Densities

Dielectric capacitors with ultrahigh power densities are fundamental energy storage components in electrical and electronic systems. However, a long-standing challenge is improving their energy densities. We report dielectrics with ultrahigh energy densities designed with polymorphic nanodomains. Guided by phase-field simulations, we conceived and synthesized lead-free BiFeO3-BaTiO3-SrTiO3 solid-solution films to realize the coexistence of rhombohedral and tetragonal nanodomains embedded in a cubic matrix. We obtained minimized hysteresis while maintaining high polarization and achieved a high energy density of 112 joules per cubic centimeter with a high energy efficiency of ~80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscale domain structure manipulation.

Arbitrary Shape Engineerable Spiral Micropseudocapacitors with Ultrahigh Energy and Power Densities

2015 ◽  
Vol 27 (45) ◽  
pp. 7476-7482 ◽  
Author(s):  
Xiaocong Tian ◽  
Mengzhu Shi ◽  
Xu Xu ◽  
Mengyu Yan ◽  
Lin Xu ◽  
...  
Keyword(s):  
Arbitrary Shape ◽  
Ultrahigh Energy ◽  
Power Densities
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