Vanadium doped hierarchical porous nickel-cobalt layered double hydroxides nanosheet arrays for high-performance supercapacitor

Wu, Zongxiao; Khalafallah, Diab; Teng, Changqing; Wang, Xiaoqing; Zou, Qiang; Chen, Jianhui; Zhi, Mingjia; Hong, Zhanglian

doi:10.1016/j.jallcom.2020.155604

Cited by 67 publications

(34 citation statements)

References 72 publications

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“…A potentiostat (Princeton Applied Research, VersaSTAT 3) was used with a conventional three-electrode electrochemical cell containing a 2 M KOH electrolyte, Ni 1−x V x O as the working electrode, a saturated well-defined diffraction peaks in the measured XRD spectrum of Ni 0.75 V 0.25 O because of the lattice distortion following V doping, resulting in the degradation of the crystalline quality. 33 The effect of V doping on NiO is confirmed by measuring the Raman spectra of the NiO and NiVO electrodes (Figure 3b).…”

Section: Methodsmentioning

confidence: 77%

“…39,40 The systematic evolution of the XRD patterns and the shift in the Raman peaks of the Ni 3d). 20,41 The peaks located at 856.6 and 874.1 eV are due to the Ni 3+ oxidation states, 33 while the other peaks are shakeup satellite peaks related to Ni 2+ and Ni 3+ . Interestingly, the binding states of Ni 2p 3/2 and Ni 2p 1/2 shift toward a high energy side by 0.8 eV relative to those of undoped NiO, suggesting the modification of the electronic structure upon V doping.…”

Section: Methodsmentioning

confidence: 99%

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Optimal Rule-of-Thumb Design of Nickel–Vanadium Oxides as an Electrochromic Electrode with Ultrahigh Capacity and Ultrafast Color Tunability

Chavan

Hou

et al. 2021

ACS Appl. Mater. Interfaces

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The use of electrodes capable of functioning as both electrochromic windows and energy storage devices has been extended from green building development to various electronics and displays to promote more efficient energy consumption. Herein, we report the electrochromic energy storage of bimetallic NiV oxide (NiVO) thin films fabricated using chemical bath deposition. The best optimized NiVO electrode with a Ni/V ratio of 3 exhibits superior electronic conductivity and a large electrochemical surface area, which are beneficial for enhancing electrochemical performance. The color switches between semitransparent (a discharged state) and dark brown (a charged state) with excellent reproducibility because of the intercalation and deintercalation of OH– ions in an alkaline KOH electrolyte. A specific capacity of 2403 F g–1, a coloration efficiency of 63.18 cm2 C–1, and an outstanding optical modulation of 68% are achieved. The NiVO electrode also demonstrates ultrafast coloration and bleaching behavior (1.52 and 4.79 s, respectively), which are considerably faster than those demonstrated by the NiO electrode (9.03 and 38.87 s). It retains 91.95% capacity after 2000 charge–discharge cycles, much higher than that of the NiO electrode (83.47%), indicating that it has significant potential for use in smart energy storage applications. The superior electrochemical performance of the best NiVO compound electrode with an optimum Ni/V compositional ratio is due to the synergetic effect between the high electrochemically active surface area induced by V-doping-improved redox kinetics (low charge-transfer resistance) and fast ion diffusion, which provides a facile charge transport pathway at the electrolyte/electrode interface.

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Section: Methodsmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Optimal Rule-of-Thumb Design of Nickel–Vanadium Oxides as an Electrochromic Electrode with Ultrahigh Capacity and Ultrafast Color Tunability

Chavan

Hou

et al. 2021

ACS Appl. Mater. Interfaces

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“…For example, NiCo-LDH had superior high theoretical specific capacitance of 774 F•g −1 at the current density of 0.2 A•g −1 [10]. However, the relatively sluggish electrochemical reaction kinetics of NiCo-LDH, like the relatively low charge transport rate, the low specific surface area, poor conductivity, and limited exposed electroactive sites, consequently, hinders the electrochemical performance [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Hydrazine Hydrate Induced Three-Dimensional Interconnected Porous Flower-like 3D-NiCo-SDBS-LDH Microspheres for High-Performance Supercapacitor

et al. 2022

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Porous structure and surface defects are important to improve the performance of supercapacitors. In this study, a facile pathway was developed for high-performance supercapacitors, which can produce transition metal hydroxides (LDHs) with abundant porous structure and surface defects. The NiCo-SDBS-LDH was prepared by one-step hydrothermal reaction using sodium dodecylbenzene sulfonate (SDBS) as anionic surfactant. And then, three dimensional (3D) interconnected porous flower-like 3D-NiCo-SDBS-LDH microspheres were designed and synthesized using the gas-phase hydrazine hydrate reduction method. Results showed that the hydrazine hydrate reduction not only introduces a large number of pores into 3D-NiCo-SDBS-LDH microspheres and causes the formation of oxygen vacancies, but it also roughens the surface of the microspheres. All these changes contribute to the enhancement of electrochemical activity of 3D-NiCo-SDBS-LDH; the NiCo-SDBS-LDH electrode after hydrazine hydrate treatment (3D-NiCo-SDBS-LDH) exhibits a higher specific capacitance of 1148 F·g−1 at 1 A·g−1 (about 1.46 times larger than that of NiCo-SDBS-LDH) and excellent long cycle life with 94% retention after 4000 cycles. Moreover, the assembled 3D-NiCo-SDBS-LDH//AC (active carbon) asymmetric supercapacitor (ASC) achieves remarkable energy density of 73.14 W h·kg−1 at 800 W·kg−1 and long-term cycling stability of 95.5% retention for up to 10,000 cycles. The outstanding electrochemical performance can be attributed to the synergy between the rich porous structure and the roughened surface that has been created by the hydrazine hydrate treatment.

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“…The electrochemical properties of nickel-cobalt hydroxides depend largely on the special morphological nanostructures [19][20][21][22][23] and compositions of the metal ions [24,25]. In previous studies, Wu et al [26] synthesized vanadium-doped hierarchical porous nickelcobalt layered double hydroxides nanosheet arrays that provided a high specific capacitance of 2960 F g −1 at a current density of 1 A g −1 . Yan et al [27] designed the nickel-cobalt layered double hydroxide hollow microspheres with hydrangea-like morphology, exhibiting a specific capacitance of 2158.7 F g −1 under a current density of 1 A g −1 .…”

Section: Introductionmentioning

confidence: 99%

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

et al. 2021

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Layered double hydroxides as typical supercapacitor electrode materials can exhibit superior energy storage performance if their structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel–cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to regulate the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility, adjust the thickness and optimize the internal pore structures of NiCo-LDHs, thereby enhancing their capacitance performance. When the content of urea is reduced from 0.03 to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheet structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g−1 under the current density of 1 A g−1 and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g−1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g−1 at 1 A g−1 with the capacitance retention of 78% over 1000 cycles. The current work offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

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Vanadium doped hierarchical porous nickel-cobalt layered double hydroxides nanosheet arrays for high-performance supercapacitor

Cited by 67 publications

References 72 publications

Optimal Rule-of-Thumb Design of Nickel–Vanadium Oxides as an Electrochromic Electrode with Ultrahigh Capacity and Ultrafast Color Tunability

Optimal Rule-of-Thumb Design of Nickel–Vanadium Oxides as an Electrochromic Electrode with Ultrahigh Capacity and Ultrafast Color Tunability

Hydrazine Hydrate Induced Three-Dimensional Interconnected Porous Flower-like 3D-NiCo-SDBS-LDH Microspheres for High-Performance Supercapacitor

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

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