Oxygen-deficient tungsten oxide nanorods with high crystallinity: Promising stable anode for asymmetric supercapacitors

Wang, Rui; Lu, Yongzhuang; Zhou, Lijun; Han, Yi; Ye, Jianqing; Xu, Wei; Lu, Xihong

doi:10.1016/j.electacta.2018.06.188

Cited by 31 publications

(10 citation statements)

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“…The data are presented in a Ragone plot (Figure A), which indicate that relatively high power‐energy characteristics were obtained for the asymmetric device with high active mass. High power‐energy characteristics have also been reported in other investigations . It is important to note that specific capacitance, power density, and energy density decrease significantly with increasing active mass.…”

Section: Resultssupporting

confidence: 75%

“…High powerenergy characteristics have also been reported in other investigations. [42][43][44] It is important to note that specific capacitance, power density, and energy density decrease significantly with increasing active mass. Therefore, good electrochemical performance at high active mass, achieved in our investigation, is promising for practical applications.…”

Section: Resultsmentioning

confidence: 99%

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High areal capacitance of Fe₃O₄‐decorated carbon nanotubes for supercapacitor electrodes

et al. 2019

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A conceptually new approach has been developed for the fabrication of magnetite (Fe 3 O 4 )-decorated carbon nanotubes (M-CNTs) for negative electrodes of electrochemical supercapacitors. M-CNTs were prepared by an ultrasonic-assisted chemical synthesis method, which involved dispersion of functionalized CNTs in water, Fe 3 O 4 formation on the CNTs surface, and particle extraction through liquid-liquid interface (PELLI). Palmitic acid was found to be an efficient new extractor for PELLI. The slurries produced after drying and redispersing M-CNTs and slurries obtained using PELLI were used for electrode fabrication. The electrodes prepared using PELLI showed superior performance due to reduced particle agglomeration. Testing results provided an insight into the influence of Fe 3 O 4 /CNTs mass ratio on the capacitance and capacitance retention at high charge-discharge rates. A capacitance of 5.82 F cm −2 (145.4 F g −1 ) was achieved in Na 2 SO 4 electrolyte using electrodes with high active mass of 40 mg cm −2 and ratio of active mass to current collector mass of 0.6. Good electrochemical performance was achieved at low impedance.The capacitance of the negative M-CNTs electrodes was comparable with capacitance of advanced positive MnO 2 -CNTs electrodes, which was beneficial for the fabrication of asymmetric devices. The asymmetric device has been fabricated, which showed promising performance in a voltage window of 1.6 V. K E Y W O R D Sasymmetric device, capacitance, carbon nanotube, composite, magnetite, supercapacitor

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

High areal capacitance of Fe₃O₄‐decorated carbon nanotubes for supercapacitor electrodes

et al. 2019

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“…The inner active materials can be very accessible to ions and electrons so that redox reactions can be accelerated. WO 3 -based nanostructures, including quantum dots [ 95 ] ( Figure 5 a) and nano particles, nanofibers [ 67 ], nanorods [ 68 , 72 , 73 ], nanotubes [ 70 ], nanochannels [ 81 ] and nanowires [ 74 , 75 ], nanoflakes [ 51 ], nanoplates and nanosheets [ 69 ] ( Figure 5 c), nanospheres [ 76 ], and nanoflowers have all been researched. Cong et al [ 95 ] demonstrated that the WO 3 quantum dots have better reversibility according to the more symmetric charge-discharge curve ( Figure 5 b) and more excellent rate performance.…”

Section: Energy Storage Devices Based On Tungsten Oxidesmentioning

confidence: 99%

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Han

Shi

2021

Nanomaterials

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Tungsten oxide-based materials have drawn huge attention for their versatile uses to construct various energy storage devices. Particularly, their electrochromic devices and optically-changing devices are intensively studied in terms of energy-saving. Furthermore, based on close connections in the forms of device structure and working mechanisms between these two main applications, bifunctional devices of tungsten oxide-based materials with energy storage and optical change came into our view, and when solar cells are integrated, multifunctional devices are accessible. In this article, we have reviewed the latest developments of tungsten oxide-based nanostructured materials in various kinds of applications, and our focus falls on their energy-related uses, especially supercapacitors, lithium ion batteries, electrochromic devices, and their bifunctional and multifunctional devices. Additionally, other applications such as photochromic devices, sensors, and photocatalysts of tungsten oxide-based materials have also been mentioned. We hope this article can shed light on the related applications of tungsten oxide-based materials and inspire new possibilities for further uses.

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“…During the doping process, the concentration of oxygen vacancies can get strengthened, which serve as shallow donors to adjust the band gap and tune the electron structure, consequently improving the electrical conductivity [22,24,25,34]. Simultaneously, oxygen vacancies can also act as extra active sites for redox reactions to enhance the electrochemical properties [35][36][37]. Therefore, it is urgently desirable to develop metal doping NiMoO 4 electrodes for reinforcing energy density and cycle life of aqueous rechargeable Ni-Zn batteries.…”

Section: Introductionmentioning

confidence: 99%

Oxygen vacancies-rich cobalt-doped NiMoO4 nanosheets for high energy density and stable aqueous Ni-Zn battery

et al. 2020

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The enhancement of energy density and cycling stability is in urgent need for the widespread applications of aqueous rechargeable Ni-Zn batteries. Herein, a facile strategy has been employed to construct hierarchical Co-doped Ni-MoO 4 nanosheets as the cathode for high-performance Ni-Zn battery. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of oxygen vacancies, the NiMoO 4 with 15% cobalt doping (denoted as CNMO-15) displays the best capacity of 361.4 mA h g −1 at a current density of 3 A g −1 and excellent cycle stability. Moreover, the assembled CNMO-15//Zn battery delivers a satisfactory specific capacity of 270.9 mA h g −1 at 2 A g −1 and a remarkable energy density of 474.1 W h kg −1 at 3.5 kW kg −1 , together with a maximum power density of 10.3 kW kg −1 achieved at 118.8 W h kg −1 . Noticeably, there is no capacity decay with a 119.8% retention observed after 5000 cycles, demonstrating its outstanding long lifespan. This work might provide valuable inspirations for the fabrication of high-performance Ni-Zn batteries with superior energy density and impressive stability.

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Oxygen-deficient tungsten oxide nanorods with high crystallinity: Promising stable anode for asymmetric supercapacitors

Cited by 31 publications

References 50 publications

High areal capacitance of Fe₃O₄‐decorated carbon nanotubes for supercapacitor electrodes

High areal capacitance of Fe₃O₄‐decorated carbon nanotubes for supercapacitor electrodes

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Oxygen vacancies-rich cobalt-doped NiMoO4 nanosheets for high energy density and stable aqueous Ni-Zn battery

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Oxygen-deficient tungsten oxide nanorods with high crystallinity: Promising stable anode for asymmetric supercapacitors

Cited by 31 publications

References 50 publications

High areal capacitance of Fe3O4‐decorated carbon nanotubes for supercapacitor electrodes

High areal capacitance of Fe3O4‐decorated carbon nanotubes for supercapacitor electrodes

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Oxygen vacancies-rich cobalt-doped NiMoO4 nanosheets for high energy density and stable aqueous Ni-Zn battery

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High areal capacitance of Fe₃O₄‐decorated carbon nanotubes for supercapacitor electrodes

High areal capacitance of Fe₃O₄‐decorated carbon nanotubes for supercapacitor electrodes