Journal ArticleDOI
Nickel–Cobalt Layered Double Hydroxide Nanosheets for High-performance Supercapacitor Electrode Materials
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TLDR
In this article, a facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants.Abstract:
A facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants. As pseudocapacitors, the as-obtained Ni-Co LDH hybrid film-based electrodes display a significantly enhanced specific capacitance (2682 F g−1 at 3 A g−1, based on active materials) and energy density (77.3 Wh kg−1 at 623 W kg−1), compared to most previously reported electrodes based on nickel-cobalt oxides/hydroxides. Moreover, the asymmetric supercapacitor, with the Ni-Co LDH hybrid film as the positive electrode material and porous freeze-dried reduced graphene oxide (RGO) as the negative electrode material, exhibits an ultrahigh energy density (188 Wh kg−1) at an average power density of 1499 W kg−1 based on the mass of active material, which greatly exceeds the energy densities of most previously reported nickel or cobalt oxide/hydroxide-based asymmetric supercapacitors.read more
Citations
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Ultracapacitors: Why, How, and Where is the Technology
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.
Journal ArticleDOI
Design and Mechanisms of Asymmetric Supercapacitors.
Yuanlong Shao,Maher F. El-Kady,Jingyu Sun,Yaogang Li,Qinghong Zhang,Meifang Zhu,Hongzhi Wang,Bruce Dunn,Richard B. Kaner +8 more
TL;DR: This review looks at the essential energy-storage mechanisms and performance evaluation criteria for asymmetric supercapacitors to understand the wide-ranging research conducted in this area and highlights several key scientific challenges.
Journal ArticleDOI
Review of supercapacitors: Materials and devices
TL;DR: In this paper, a concise description of technologies and working principles of different materials utilized for supercapacitors has been provided, where the main focus has been on materials like carbon-based nanomaterials, metal oxides, conducting polymers and their nanocomposites along with some novel materials like metal-organic frameworks, MXenes, metal nitrides, covalent organic frameworks and black phosphorus.
Journal ArticleDOI
Design Hierarchical Electrodes with Highly Conductive NiCo2S4 Nanotube Arrays Grown on Carbon Fiber Paper for High-Performance Pseudocapacitors
TL;DR: The development of highly conductive NiCo2S4 single crystalline nanotube arrays grown on a flexible carbon fiber paper (CFP), which can serve not only as a good pseudocapacitive material but also as a three-dimensional conductive scaffold for loading additional electroactive materials.
Journal ArticleDOI
NiCo2S4 Nanosheets Grown on Nitrogen‐Doped Carbon Foams as an Advanced Electrode for Supercapacitors
TL;DR: In this article, the rational design and fabrication of NiCo2S4 nanosheets supported on nitrogen-doped carbon foams (NCF) is presented as a novel flexible electrode for supercapacitors.
References
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Journal ArticleDOI
High-Quality Metal Oxide Core/Shell Nanowire Arrays on Conductive Substrates for Electrochemical Energy Storage
TL;DR: The growth approach offers a new technique for the design and synthesis of transition metal oxide or hydroxide hierarchical nanoarrays that are promising for electrochemical energy storage, catalysis, and gas sensing applications.
Journal ArticleDOI
A High Energy Density Asymmetric Supercapacitor from Nano-architectured Ni(OH)2/Carbon Nanotube Electrodes
Zhe Tang,Chunhua Tang,Hao Gong +2 more
TL;DR: In this article, an additive-free nano-architectured nickel hydroxide/carbon nanotube (Ni(OH)2/CNT) electrode was proposed for high energy density supercapacitors.
Journal ArticleDOI
Growth of ultrathin mesoporous Co3O4 nanosheet arrays on Ni foam for high-performance electrochemical capacitors
Changzhou Yuan,Changzhou Yuan,Long Yang,Linrui Hou,Laifa Shen,Xiaogang Zhang,Xiong Wen (David) Lou +6 more
TL;DR: In this article, an advanced electrode for high-performance electrochemical capacitors has been designed by growing ultrathin mesoporous Co3O4 nanosheet arrays on the Ni foam support.
Journal ArticleDOI
Substrate dependent self-organization of mesoporous cobalt oxide nanowires with remarkable pseudocapacitance.
TL;DR: Both electrode designs exhibited excellent cycling stability by retaining ∼91-94% of their maximum capacitance after 5000 cycles of continuous charge-discharge, thereby reducing device resistance and nanoporosity with large surface area to allow faster reaction kinetics.
Journal ArticleDOI
Preparation and characterization of flexible asymmetric supercapacitors based on transition-metal-oxide nanowire/single-walled carbon nanotube hybrid thin-film electrodes.
TL;DR: This work has successfully fabricated flexible asymmetric supercapacitors (ASCs) based on transition-metal-oxide nanowire/single-walled carbon nanotube (SWNT) hybrid thin-film electrodes, with advantages of mechanical flexibility, uniform layered structures, and mesoporous surface morphology.