Superior cycling stability of a crystalline/amorphous Co<sub>3</sub>S<sub>4</sub> core–shell heterostructure for aqueous hybrid supercapacitors

Liang, Miaomiao; Zhao, Mingshu; Wang, Haiyang; Zheng, Qingyang; Song, Xiaoping

doi:10.1039/c8ta08135b

Cited by 58 publications

(25 citation statements)

References 54 publications

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“…Furthermore, followed by the persisting less clarity over D band and G band contribution in MWCNTs, understanding the contribution of the amorphous and crystalline structures of the MWCNTs in their electrochemical performance is yet another unsolved problem, which remains to be one of the hottest research topics. Many of the researchers have reported that the amorphous MWCNTs have high energy storage capacity than their crystalline counterparts. − On the other hand, there are plenty of research papers available to challenge the previous statements in such a way that the crystalline counterparts have better storage capacity due to their linear arrangement, high surface atom density, fast electron transfer process, etc. − However, following the second statement and based on our diffraction, spectroscopic, and microscopic results, the enhancement of the degree of crystallinity is considered as a key factor to explain the observed changes in the capacitance of the tested samples. As seen from the XRD, Raman, TEM, and SAED patterns, the control MWCNTs show amorphous nature.…”

Section: Resultsmentioning

confidence: 92%

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Phase Transformation of Amorphous to Crystalline of Multiwall Carbon Nanotubes by Shock Waves

Sivakumar

Dhas²,

Pazhanivel

et al. 2021

Crystal Growth & Design

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It has been a fascinating journey for the researchers to explore and understand the phase-transition behavior of materials under shock-wave-loaded condition as it has attained the status of being one of the prominent research topics in recent years due to its technological predominance so that it is imperative to understand the behavior of materials under high pressure and temperature. For the present investigation, multiwall carbon nanotubes (MWCNTs) are preferred over the other materials for shock wave impact study because MWCNTs are one of the most important as well as technologically interesting materials. However, despite many attempts over the years, the study of phase transition of materials under high-pressure and -temperature conditions continues to be a challenging task and its implications with respect to the applications to date have emerged as an ongoing debatable area. In this line, we have succeeded in tracking the phase-transition behavior of MWCNTs from amorphous-to-crystalline transition (ACT) influenced by the dynamic impact of shock waves with which experimental analyses have been performed and the details are presented. The data obtained from X-ray diffraction (XRD), Raman analysis, transmission electron microscopy (TEM), and selected area electron diffraction (SAED) reveal the formation of crystalline CNTs at 300 shock pulse-loaded condition. Due to the growing demand of industrial requirements for crystalline CNTs in energy storage applications, the samples have been subjected to the investigation of their electrochemical charge storage performances so as to ensure their utilization. Interestingly, the shock-loaded samples show substantial improvement in the electrochemical properties such that the maximum value of specific capacitance for the control 150 and 300 shocks-loaded CNTs are found to be 196, 215, and 294 F g–1, respectively.

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Section: Resultsmentioning

confidence: 92%

“…According to the assignment of analogues in earlier studies, there are several parameters such as degree of crystallinity, lattice symmetry, Schottky barrier, electron scattering (electron transfer process), delocalizations of pi orbital, etc. that play a vital role in the change in specific capacitance. − …”

Section: Resultsmentioning

confidence: 99%

Phase Transformation of Amorphous to Crystalline of Multiwall Carbon Nanotubes by Shock Waves

Sivakumar

Dhas²,

Pazhanivel

et al. 2021

Crystal Growth & Design

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“…Figure a,b depicts the CV plots of NiWO 4 _ x ( x = 300 and 600) electrodes taken at a series of scan rates (5–25 mV s –1 ) in the voltage window of 0–0.6 V via Hg/HgO reference electrode. The shapes of CV curves alter scarcely at the different scan rates, implying the fine redox reaction reversibility of the electrode materials. , With the increasing scan rate, the redox peaks of NiWO 4 _300 electrode visibly shift to the opposite direction with a broad potential gap and the redox peaks of NiWO 4 _600 electrode almost remain constant, which may be the result from the different dynamics process. In PECs electrodes, the kinetics process can be confirmed through the relation between the redox peak current ( I p ) and scan rate (ν).…”

Section: Resultsmentioning

confidence: 97%

“…Compared with the well-crystallized NiWO 4 _600 electrode, excellent capacitive performance of the amorphous NiWO 4 _300 electrode could be attributed primarily to its distinctive structure. First, the amorphous phase can provide more active sites and act as the ions reservoir, promoting electrolyte ions to spread in the electrode on account of the disordered structure and isotropic nature. , Next, the larger specific surface area and mesoporous nature of the NiWO 4 _300 electrode augment the electrode and electrolyte contact area and promote the propagation of electrolyte ions in the electrode material . Finally, the presence of oxygen vacancies in the NiWO 4 _300 electrode obviously enhances its electrical conductivity, reduces the resistance during electrolyte ions insertion/depletion, and facilitates the phase transition during the redox course .…”

Section: Resultsmentioning

confidence: 99%

Amorphous NiWO₄ Nanospheres with High-Conductivity and -Capacitive Performance for Supercapacitors

et al. 2019

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Amorphous and monoclinic wolframite NiWO4 nanoparticles are successfully synthesized by annealing the NiWO4_70 sample obtained via the simple chemical precipitation approach at 300 and 600 °C, respectively. With the elevated annealing temperature, the specific surface area reduces appreciably with decreasing porosity. The electrical conductivity of amorphous NiWO4_300 sample enhances almost 1 order of magnitude than that of crystal NiWO4_600 sample. The electrochemical properties of NiWO4_x (x = 300 and 600) as electrodes of supercapacitors are characterized via the potentiostatic and galvanostatic cycle measurements and electrochemical impedance spectroscopy (EIS). The NiWO4_300 electrode exhibits an excellent specific capacitance of 437.2 F g–1 at a current density of 0.1 A g–1 and ∼54% capacitive retention while the current density is enhanced 10-fold. Meantime, the NiWO4_300 electrode displays the high Coulombic efficiency (>94%) after 500 cycles. The excellent electrochemical performance of the amorphous NiWO4_300 electrode could result from the diffusion-controlled kinetics, high electrical conductivity, and large surface area.

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“…One effective strategy is the construction of crystalline/amorphous composite by introducing amorphous materials, like amorphous carbon-based materials, transition-metal oxides, sulfides, phosphates, and hydroxides. − The distinctive features of amorphous materials including disorder or short-range order but long-range disorder structure, isotropic nature, and abundant inherent defects can be conducive to provide an open framework, fast ion-diffusion channel, and excellent capacitive performance. , Moreover, the amorphous counterparts possess abundant oxygen vacancies and unsaturated surface atoms, which are beneficial for absorbing OH – and generating abundant active sites. , Therefore, the incorporation of superior amorphous materials and crystalline LDH materials will be beneficial for constructing hierarchical composites with enhanced energy storage properties …”

Section: Introductionmentioning

confidence: 99%

Boosting Specific Capacity for Supercapattery by In Situ Formation of Amorphous Ni–Co–Borate on MOF-Derived Ni–Co–LDH Nanosheet Array

Zhou

Kuang

Wang

et al. 2020

ACS Appl. Energy Mater.

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Amorphous materials have great potential for storing energy owing to their porous structure, high stability, and fast charging rate. Also, ingeniously incorporating amorphous materials into crystalline materials through surface amorphization strategy can construct excellent electrodes for supercapattery. Herein, Ni−Co-layered double hydroxide/Ni−Co−borate (Ni−Co− LDH/Ni−Co−B i ) composite is synthesized by in situ formation of amorphous Ni−Co−borate on metal−organic frameworks (MOFs)-derived Ni−Co−LDH nanosheet array. The adherent amorphous Ni−Co−borate can modulate the crystalline and electronic structures of Ni−Co−LDH, which provide an effective path for electron transfer and boosts the kinetics of redox reaction. Consequently, the crystalline/amorphous Ni−Co−LDH/Ni−Co−B i composite shows a high specific capacity of 891 C/g at 1 A/g. When used as a battery-type electrode to assemble supercapattery, it displays a maximum energy density of 62.8 Wh/kg at a power density of 800 W/kg and fine stability (∼81% capacity retention after 5000 cycles). In addition, an all-solid-state supercapattery can lighten a white light-emitting diode (LED) for 60 s, demonstrating potential practical applications of Ni−Co− LDH/Ni−Co−B i . Hence, it is a very promising study to shed substantial light on inspiring crystalline/amorphous materials for energy storage.

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Superior cycling stability of a crystalline/amorphous Co₃S₄ core–shell heterostructure for aqueous hybrid supercapacitors

Abstract: In this article, a novel crystalline/amorphous Co3S4 core–shell heterostructure supported on nickel foam is fabricated through a facile method.

Cited by 58 publications

References 54 publications

Phase Transformation of Amorphous to Crystalline of Multiwall Carbon Nanotubes by Shock Waves

Phase Transformation of Amorphous to Crystalline of Multiwall Carbon Nanotubes by Shock Waves

Amorphous NiWO₄ Nanospheres with High-Conductivity and -Capacitive Performance for Supercapacitors

Boosting Specific Capacity for Supercapattery by In Situ Formation of Amorphous Ni–Co–Borate on MOF-Derived Ni–Co–LDH Nanosheet Array

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Superior cycling stability of a crystalline/amorphous Co3S4 core–shell heterostructure for aqueous hybrid supercapacitors

Abstract: In this article, a novel crystalline/amorphous Co3S4 core–shell heterostructure supported on nickel foam is fabricated through a facile method.

Cited by 58 publications

References 54 publications

Phase Transformation of Amorphous to Crystalline of Multiwall Carbon Nanotubes by Shock Waves

Phase Transformation of Amorphous to Crystalline of Multiwall Carbon Nanotubes by Shock Waves

Amorphous NiWO4 Nanospheres with High-Conductivity and -Capacitive Performance for Supercapacitors

Boosting Specific Capacity for Supercapattery by In Situ Formation of Amorphous Ni–Co–Borate on MOF-Derived Ni–Co–LDH Nanosheet Array

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Product

Resources

About

Superior cycling stability of a crystalline/amorphous Co₃S₄ core–shell heterostructure for aqueous hybrid supercapacitors

Amorphous NiWO₄ Nanospheres with High-Conductivity and -Capacitive Performance for Supercapacitors