Polypyrrole Nanotube-Interconnected NiCo-LDH Nanocages Derived by ZIF-67 for Supercapacitors

Zang, Yang; Luo, Hui; Zhang, Hang; Xue, Huaiguo

doi:10.1021/acsaem.0c02465

Cited by 98 publications

(29 citation statements)

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“…Meanwhile, the related energy and power density of ASCs devices were calculated. The maximum energy density of our fabricated 3D-NiCo-SDBS-LDH//AC device reached as high as 73.14 W h•kg −1 at power density of 800 W•kg −1 , which is higher than many previously reported NiCo-LDH-based ASCs demonstrated in Table 2 [38,[54][55][56][57][58]. Remarkably, the 3D-NiCo-SDBS-LDH//AC device retained 71.1% capacitance at increasing current density from 1 A•g −1 to 20 A•g −1 (Figure 7e), revealing the good rate performance.…”

Section: Resultsmentioning

confidence: 50%

“…Notably, the 3D-NiCo-SDBS-LDH//AC device also exhibited extraordinary long-term life with the capacitance retention of 95.50% over10000 cycles at 5 A•g −1 (Figure 7f), which was higher than the 84.7% of NiCo-SDBS-LDH// AC. Such cycling stability outperforms those reported for NiCo-LDH-based ASCs devices such as CoSx/NiCo LDH nanocages//AC (94.56% after 10000 cycles) [54], NiCo-LDH/Ag nanowires//AC (88.2% after 2000 cycles) [55], His-GQD/NiCo-LDH//AC (91.13% after 6000 cycles) [56], and PNT@NiCo-LDH//AC (84.3% after 5000 cycles) [58].…”

Section: Resultsmentioning

confidence: 56%

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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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Section: Resultsmentioning

confidence: 50%

Section: Resultsmentioning

confidence: 56%

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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“…Figure a presents the cyclic voltammetry (CV) curves of CoNi‐DH, Ti 3 C 2 T x , and CoNi‐DH@Ti 3 C 2 T x at 5 mV s −1 . One pair of redox peaks appear from the Faradaic redox transition related to Ni 3+ /Ni 2+ , Co 3+ /Co 2+ , and Ti [ 43,44 ] as shown in the following

\begin{matrix} {Ti}_{3} {normalC}_{2} {normalT}_{normalx} (normalT = normalO, OH, normalF) + y {normalK}^{+} + y {normale}^{-} \leftrightarrow {Ti}_{3} {normalC}_{2} {normalT}_{normalx} {normalK}_{y} \end{matrix}

\begin{matrix} M {(OH)}_{2} + {OH}^{-} \leftrightarrow MOOH + {normalH}_{2} O + {normale}^{-} (normalM represents Co or Ni) \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4a presents the cyclic voltammetry (CV) curves of CoNi-DH, Ti 3 C 2 T x , and CoNi-DH@Ti 3 C 2 T x at 5 mV s −1 . One pair of redox peaks appear from the Faradaic redox transition related to Ni 3+ /Ni 2+ , Co 3+ /Co 2+ , and Ti [43,44] as shown in the following ( )…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Bai

Zhang

Guo

et al. 2021

Advanced Sustainable Systems

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of the promising candidates for energy storage due to the high power density, environmental friendliness, remarkable charge/discharge capability, long cycling life, and safety. [4,5] Processing nanomaterials into freestanding films with high conductivity and good mechanical stability is of great significance for supercapacitors. To choose appropriate nanomaterials for high-performance supercapacitors, remarkable surface properties, inherent high strength and electrical conductivity must be considered. [6,7] In the search for alternatives that provide all these characteristics, MXene, a recently discovered 2D material shows great potential. MXenes is a novel candidate of the 2D family (MXenes described as M n+1 X n T x , where M, X, and T x usually represent the early transition metal, C or N, and adsorbed surface functional groups such as OH, O, and F, where n = 1, 2, or 3). [8] 2D transition metal carbide and nitride MXene (including Ti 3 C 2 T x , Mo 2 CT x , and V 4 C 3 T x ) are excellent electrode materials for supercapacitors due to the high metallic conductivity, excellent cycling stability, and surface chemical groups galore. [9] The preparation of MXene freestanding film by vacuum-assisted filtration is the optimal choice to achieve these properties. [10] For instance, rolled Ti 3 C 2 T x films show a high conductivity of 150 000 S m −1 and gravimetric capacitance Flexible electrodes with excellent energy storage and conversion properties that can be produced by a simple process are highly desirable for supercapacitors. Herein, Cobalt-Nickel double hydroxide (CoNi-DH) micro-nanosheet arrays are prepared uniformly on naturally sedimented Ti 3 C 2 T x films by an etching-deposition-growth process to form a CoNi-DH@Ti 3 C 2 T x heterostructure. The naturally sedimented Ti 3 C 2 T x film serves as the substrate to minimize aggregation of the CoNi-DH nano arrays to enhance the electrical conductivity. Furthermore, the hierarchical structure comprised of the CoNi-DH interconnected nanoarrays promotes electrolyte access. By taking advantage of the excellent electrical conduction and high theoretical specific capacitance, the flexible CoNi-DH@Ti 3 C 2 T x electrode in the supercapacitor delivers a superior specific capacitance of 919.5 F g −1 at 1 A g −1 , and remarkable capacitance retention of 89.6% after 5000 cycles at 20 A g −1 . Density-functional theory calculations are performed to investigate the charge density difference and partial density of states of CoNi-DH@Ti 3 C 2 T x and the theoretical assessment suggests that the chemical bonds between Ti 3 C 2 T x and CoNi-DH are critical to the charge transport, electrical conductivity, and structural stability.

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“…The resultant sample exhibited an outstanding discharge capacitance (657 C g −1 at 1 A g −1 ) and remarkable rate performance. Zang et al [36] prepared ZIF-67 derived PNT@NiCo-LDH for an electrode material for SCs, which achieved a high specific capacitance of 724.1 C g −1 at 1 A g −1 and outstanding cycling stability (84.3% retention after 5000 cycles). Notably, the electrochemical performance of PNT@NiCo-LDH is better than that of single CoNi-LDH nanocages.…”

Section: Introductionmentioning

confidence: 99%

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

Zhang

Wang

et al. 2021

Adv Materials Inter

103

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The energy storage behavior of amorphous carbon is mostly dependent on the electrostatic interaction between the surface of the conducting electrode and the electrolytic ions. Therefore, the energy densities of commercial SCs are relatively low. [9] This essential defect seriously hinders the application of SCs in energy transformation system, so improving the energy density of them is an urgent problem. For this reason, a lot of pseudocapacitor materials with battery characteristics have been developed with the purpose of enhancing the energy density of SCs, including such as conjugated polymers [10,11] and transition metal compounds. [12,13] Transition-metal hydroxides are ideal pseudocapacitive materials for pseudocapacitors because of their large theoretical capacity. [14,15] Thus, intensive research work has been carried out to develop hydroxides with high pseudocapacitance performance. To date, a variety of low-cost hydroxides such as Ni(OH) 2 , [16,17] Co(OH) 2 , [18] CoAl-LDH, [19] CoFe-LDH, [20] NiMn-LDH, [21] NiCo-LDH, [22] and NiCu-LDH [23] have been widely investigated. However, these battery-type hydroxides usually possess poor electrical conductivity and relatively large volume changes during fast charge-discharge tests, thus leading to low cycling stability and poor rate capability. [24,25] The electronic conductivity and structural stability of layered double hydroxide (LDH) can be improved by heteroatomic doping. The heteroatom-doped LDH possesses large amounts of electronholes resulting from lattice distortion, thus increasing the electronic conductivity of LDH. Recently, Niu et al. [26] synthesized a N, C double-doped NiCo-LDH by hydrothermal reaction. The resultant sample exhibited an outstanding discharge capacitance of 606.9 C g −1 at 2 mV s −1 . In addition, N-C doping can greatly improve the rate capability and cycling stability.The logical microstructure design of transition-metal hydroxides at the nanoscale is another effective method to enhance the pseudocapacitance performance. [27] Among a variety of nanostructures, multi-dimensional nanostructures with welldefined inner void spaces and hierarchical nanocages can effectively avoid the self-aggregation of transition-metal hydroxides. The porous nanostructure is also appropriate for the infiltration of electrolyte ions and fast faraday reaction of active species. In addition, the nanocages are composed of interlaced ultrathin nanosheets, which possess rich electrochemically active sites and high superficial areas. Thus, the construction of

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Polypyrrole Nanotube-Interconnected NiCo-LDH Nanocages Derived by ZIF-67 for Supercapacitors

Cited by 98 publications

References 50 publications

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

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

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

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Polypyrrole Nanotube-Interconnected NiCo-LDH Nanocages Derived by ZIF-67 for Supercapacitors

Cited by 98 publications

References 50 publications

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

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

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti3C2Tx for High‐Performance Flexible Supercapacitors

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

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Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors