The ZnCo2O4@NiCo2S4@PPy core-shell nanosheets material is prepared by directly growing leaf-like ZnCo2O4 nanosheets derived from the metal-organic framework (MOF) on Ni foam (NiF) via chemical bath deposition and annealing methods and then combining with NiCo2S4 and PPy via electrodeposition methods. The special core-shell structure formed by MOF-derived ZnCo2O4, NiCo2S4 and PPy creates a bi-interface, which could significantly promote the contact between electrode and electrolyte, provide more active sites and accelerate electron/ion transfer. And the combination of these three materials also produces a strong synergistic effect, which could further improve the capacitive performance of the electrode. Therefore, the ZnCo2O4@NiCo2S4@PPy/NiF electrode exhibits the maximum areal capacitance (3.75 F/cm2) and specific capacitance (2507.0 F/g) at 1 mA/cm2 and 0.5 A/g, respectively. Moreover, its capacitance retention rate is still 83.2% after 5,000 cycles. In addition, a coin-type hybrid supercapacitor (HSC) is assembled and displays a high energy density of 44.15 Wh/kg and good cycling performance.
Constructing multicomponent electrode materials with a rational structure is an effective route to develop high-performance supercapacitors. We herein report a novel nickel-foam-supported hierarchical CoO@Ni(OH)2 nanowire-nanosheet core-shell heterostructure array synthesized by a facile hydrothermal-electrodeposition strategy. The core CoO nanowire arrays with good electrical conductivity and shell Ni(OH)2 nanosheets with thickness of ∼ 2 nm synergistically contributes to increased active sites...
#1Yunfang Gao(Zhejiang University of Technology)H-Index: 6
#2Wu Baoliang(Zhejiang University of Technology)H-Index: 2
Last. Haihua Wu(Zhejiang University of Technology)H-Index: 11
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Abstract Rational designing microstructure of electrode materials has been regarded as an effective solution for boosting the electrochemical activity. To improve the electrochemical performance of NiCo2S4 for asymmetric supercapacitors (ASCs), a three-dimensional waxberry-like open hollow NiCo2S4 is designed and fabricated via self-assembly by a facile two-step hydrothermal path. The waxberry-like open hollow architecture with rough surface and mesoporous structure can provide abundant edge/sur...
Last. Chunju Xu(North University of China)H-Index: 17
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Abstract Novel ZnCo2O4 quasi-cubes (ZnCo2O4 QCs) constructed by porous layered sheets were successfully prepared through two-step process. The precursor was initially obtained by solvothermal reaction in a combined solution of glycerin and water, and then the precursor was converted to porous ZnCo2O4 QCs after direct thermal annealing procedure in air. The ZnCo2O4 QCs were assembled by a substantial proportion of nanoparticles with an average size of 8 nm, and possessed large surface area of 83....
Last. Yezeng He(CUMT: China University of Mining and Technology)H-Index: 16
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Abstract In this work, the lamellae-like Ni/Co metal-organic framework (Ni/Co-MOF) is synthesized via a facile one-step hydrothermal process. By combining the advantages of mixed-metallic components and unique structures, the fabricated Ni/Co-MOF electrode exhibits a superior specific capacity (568 C g−1 at 1 A g−1), good rate performance (80.1% retention at 10 A g−1) and high cycling stability (75.5% retention over 3000 charge/discharge cycles). Besides, the assembling asymmetric supercapacitor...
#1Beirong Ye(University of Electronic Science and Technology of China)H-Index: 2
#2Xianjun Cao(University of Electronic Science and Technology of China)H-Index: 2
Last. Jinshu Wang(University of Electronic Science and Technology of China)H-Index: 3
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Designing high energy density and power density electrode for supercapacitors has become an increasingly important concept in the energy storage community. In this article, NiCoSe2 nanostructures are electrodeposited on nickel foam and directly used as electrode for supercapacitors. The effect on morphology and electrochemical performances of NiCoSe2 prepared under different scan rates are measured through SEM and various electrochemical measurements. The resultant NiCoSe2 prepared with 5 mV s-1...
In this study, three-dimensional (3D) hierarchical Co3O4@NiS core-shell heterostructure on nickel foam (NF) has been constructed. This Co3O4@NiS/NF can directly serve as a binder-free electrode for pseudocapacitor, achieving a high specific capacitance of 1395.3 F g1 at a current density of 1 A g1 in 6 M KOH electrolyte, and the ideal rate capability of 711 F g1 at a current density of 10 A g1. Also, the electrode remains high capacitance retention of 89.9 % after 5000 cycles. The asymmetric sup...
Abstract To obtain highly efficient supercapacitors with extraordinary capacitance, energy density, and cycle life, the design and development of new electrode materials having numerous active sites on the surface are essential. Not only the kind of material but also the surface morphology and microporous structure of the electrode plays an important role in the electrochemical performance of the supercapacitor. In the present work, a bimetallic Co/Mn-metal–organic framework (MOF) has been prepa...
Large capacitance energy storage materials have a great application prospect due to the development of portable devices. An electrochemical deposition method was used to combine amorphous CuCo2S4 with NiMoS4, which was prepared by a two-step hydrothermal method. The resulting grass-like nanowire array structure greatly promotes the utilization rate of active materials. By the addition of two variable valence metal ions, there is an increase in electrolyte touchable active sites and a decrease in...
Last. Mingzhe Zhang(JLU: Jilin University)H-Index: 23
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Abstract The micro-nano hierarchical structure of Ni3-xCoxS4 is successfully synthesized by the diffusion control and trapped dopant methods. The Ni3-xCoxS4 hierarchical architectures, which serve as electrodes for supercapacitors, exhibit a high specific capacity of 961.1 F g−1 at a current density of 1 A g−1. The Ni3-xCoxS4 hierarchical architectures also display an excellent rate capacity and a high capacitance retention of 91.07% after 5000 cycles at 10 A g−1. The long-term cycling performan...
Last. Hui Yang(CSU: Central South University)H-Index: 52
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Nanosilver paste, an interconnect solder, is a common choice in the electronic packaging industry; however, higher sintering temperatures and lower sintering strength limit its application. At present, core–shell nanoslurry has been studied and applied to chip interconnection. Based on the mechanism of heterogeneous flocculation, we have developed a new nanosilver wrapped tin paste (Sn@Ag paste), and according to the decomposition temperature of the organic dispersant in the slurry, a correspond...