Journal ArticleDOI
CoNi2S4 Nanosheet Arrays Supported on Nickel Foams with Ultrahigh Capacitance for Aqueous Asymmetric Supercapacitor Applications
TLDR
It is reported that CoNi2S4 nanosheet arrays exhibit ultrahigh specific capacitance and areal capacitance, as well as good rate capability and cycling stability, and superior electrochemical performances in an assembled aqueous asymmetric supercapacitor.Abstract:
We report that CoNi2S4 nanosheet arrays exhibit ultrahigh specific capacitance of 2906 F g–1 and areal capacitance of 6.39 F cm–2 at a current density of 5 mA cm–2, as well as good rate capability and cycling stability, and superior electrochemical performances with an energy density of 33.9 Wh kg–1 at a power density of 409 W kg–1 have been achieved in an assembled aqueous asymmetric supercapacitor. The CoNi2S4 nanosheet arrays were in situ grown on nickel foams by a facile two-step hydrothermal method. The formation mechanism of the CoNi2S4 nanosheet arrays was based on an anion-exchange reaction involving the pseudo Kirkendall effect. The two aqueous asymmetric supercapacitors in series using the CoNi2S4 nanosheet arrays as the positive electrodes can power four 3-mm-diameter red-light-emitting diodes. The outstanding supercapacitive performance of CoNi2S4 nanosheet arrays can be attributed to ravine-like nanosheet architectures with good mechanical and electrical contact, low crystallinity and good we...read more
Citations
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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
Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion
Xin-Yao Yu,Xiong Wen David Lou +1 more
TL;DR: Mixed metal sulfides (MMS) have attracted increased attention as promising electrode materials for electrochemical energy storage and conversion systems including lithium-ion batteries (LIBs), SIBs, hybrid supercapacitors (HSCs), metal-air batteries (MABs), and water splitting as discussed by the authors.
Journal ArticleDOI
Electroactive edge site-enriched nickel–cobalt sulfide into graphene frameworks for high-performance asymmetric supercapacitors
Juan Yang,Chang Yu,Xiaoming Fan,Suxia Liang,Shaofeng Li,Huawei Huang,Zheng Ling,Ce Hao,Jieshan Qiu +8 more
TL;DR: In this article, a simple strategy for fabricating edge site-enriched nickel-cobalt sulfide (Ni-Co-S) nanoparticles decorated on graphene frameworks to form integrated hybrid architectures (NiCo−S/G) via an in situ chemically converted method is reported.
Journal ArticleDOI
Ultrathin and Porous Ni3S2/CoNi2S4 3D-Network Structure for Superhigh Energy Density Asymmetric Supercapacitors
TL;DR: In this paper, a 3D-networked, ultrathin, and porous Ni3S2/CoNi2S4 on Ni foam (NF) was successfully designed and synthesized by a simple sulfidation process from 3D Ni-Co precursors.
Journal ArticleDOI
Design and synthesis of Ni-MOF/CNT composites and rGO/carbon nitride composites for an asymmetric supercapacitor with high energy and power density
TL;DR: In this article, an asymmetric supercapacitor with Ni-MOF/CNTs as the positive electrode and reduced graphene oxide/graphitic carbon nitride (rGO/g-C3N4) as the negative electrode was fabricated, and this device could be operated in a working voltage range of 0.6 V based on a complementary potential window in 6 M KOH aqueous electrolyte, delivering a high energy density of 36.6 W h kg−1 at a power density of 480 W kg− 1.
References
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Journal ArticleDOI
Materials for electrochemical capacitors
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A review of electrode materials for electrochemical supercapacitors
TL;DR: Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density.
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Carbon-based materials as supercapacitor electrodes
Lili Zhang,Xiu Song Zhao +1 more
TL;DR: This tutorial review provides a brief summary of recent research progress on carbon-based electrode materials forsupercapacitors, as well as the importance of electrolytes in the development of supercapacitor technology.
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Where Do Batteries End and Supercapacitors Begin
TL;DR: Electrochemical measurements can distinguish between different types of energy storage materials and their underlying mechanisms, used to recover power in cars and electric mass transit vehicles that would otherwise lose braking energy as heat.
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Conducting-polymer-based supercapacitor devices and electrodes
TL;DR: In-situ high-resolution transmission electron microscopy (HRTEM) studies of the structural transformations that occur during the synthesis of carbon-coated LiFePO4 and heat treatment to elevated temperatures were conducted in two different electron microscopes as discussed by the authors.