Tungsten Nitride Nanodots Embedded Phosphorous Modified Carbon Fabric as Flexible and Robust Electrode for Asymmetric Pseudocapacitor

Dubal, Deepak P.; Chodankar, Nilesh R.; Qiao, Shi Zhang

doi:10.1002/smll.201804104

Cited by 84 publications

(51 citation statements)

References 54 publications

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“…Supercapacitors are considered as one of the most reliable energy storage devices owing to their distinct features including higher power capability, low‐maintenance, nontoxic nature, and excellent cycling stability in contrast to the present Li‐ion battery. Because of these excellent features, presently, supercapacitors are used in many advanced electronic gadgets ranging from portable electronic devices to hybrid electronic vehicles …”

Section: Introductionmentioning

confidence: 99%

Self‐Assembled Nickel Pyrophosphate‐Decorated Amorphous Bimetal Hydroxides 2D‐on‐2D Nanostructure for High‐Energy Solid‐State Asymmetric Supercapacitor

Chodankar

Dubal

et al. 2019

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To obtain a supercapacitor with a remarkable specific capacitance and rate performance, a cogent design and synthesis of the electrode material containing abundant active sites is necessary. In present work, a scalable strategy is developed for preparing 2D‐on‐2D nanostructures for high‐energy solid‐state asymmetric supercapacitors (ASCs). The self‐assembled vertically aligned microsheet‐structured 2D nickel pyrophosphate (Ni2P2O7) is decorated with amorphous bimetallic nickel cobalt hydroxide (NiCo‐OH) to form a 2D‐on‐2D nanostructure arrays electrode. The resulting Ni2P2O7/NiCo‐OH 2D‐on‐2D array electrode exhibits peak specific capacity of 281 mA hg−1 (4.3 F cm−2), excellent rate capacity, and cycling stability over 10 000 charge–discharge cycles in the positive potential range. The excellent electrochemical features can be attributed to the high electrical conductivity and 2D layered structure of Ni2P2O7 along with the Faradic capacitance of the amorphous NiCo‐OH nanosheets. The constructed Ni2P2O7/NiCo‐OH//activated carbon based solid‐state ASC cell operates in a high voltage window of 1.8 V with an energy density of 78 Wh kg−1 (1.065 mWh cm−3) and extraordinary cyclic stability over 10 000 charge–discharge cycles with excellent energy efficiency (75%–80%) over all current densities. The excellent electrochemical performance of the prepared electrode and solid‐state ASC device offers a favorable and scalable pathway for developing advanced electrodes.

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Section: Introductionmentioning

confidence: 99%

Self‐Assembled Nickel Pyrophosphate‐Decorated Amorphous Bimetal Hydroxides 2D‐on‐2D Nanostructure for High‐Energy Solid‐State Asymmetric Supercapacitor

Chodankar

Dubal

et al. 2019

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“…For example, Boota and Gogotsi [10] developed an MXene-based pseudocapacitive electrode for asymmetric SCs with am aximum energy-storage capacity of 17 Wh kg À1 . Similarly,D ubal et al [11] prepared metal-nitride-based pseudocapacitive electrodes for asymmetric SCs with an energyd ensity of 2.54 mWh cm À3 at ac urrentd ensity of 4mAcm À2 .H owever,t he low mass loading of the active material( lesst han 1mgcm À2 )a nd the use of an electrode structure rathert han a thin-film have restricted the resultant energy density and cycling stability of SCs.A dditionally,t he conveyed values of capacitance and energy densities were obtained at al ow charge/ [ For improving the energy-storage capacity of pseudocapacitive electrode materials, apart from high mass loading (higher than 5mg), aw ell-defined nanostructure is necessary to provide af ast charge-transport path. [6,12] High mass loadingi sc rucial for high energy capability,w hereas fast charge transporti s required for ah igh power capability.H owever,ahigh mass loading of the active electrode material on the current collector leads to the formation of at hick and dense layer of active material, which adversely affects the rate kinetics, shrinkingt he energy storingc apacity of the electrode.…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

et al. 2019

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A porous nanostructure and high mass loading are crucial for a pseudocapacitor to achieve a good electrochemical performance. Although pseudocapacitive materials, such as MnO2 and MoS2, with record capacitances close to their theoretical values have been realized, the achieved capacitances are possible only when the electrode mass loading is less than 1 mg cm−2. Increasing the mass loading affects the capacitance as electron conduction and ion diffusion become sluggish. Achieving fast ion and electron transport at high mass loadings through all active sites remains a challenge for high‐mass‐loading electrodes. In this study, 2D MnO2 nanosheets supported on carbon fibers (MnO2@CF) as well as MoS2@CF with high mass loadings (6.6 and 7.2 mg cm−2, respectively) were used in a high‐energy pseudocapacitor. These hierarchical 2D nanosheets yielded outstanding areal capacitances of 1187 and 495 mF cm−2 at high current densities with excellent cycling stabilities. A pliable pseudocapacitive solid‐state asymmetric supercapacitor was designed using MnO2@CF and MoS2@CF as the positive and negative electrodes, respectively, with a high mass loading of 14.2 mg cm−2. The assembled solid‐state asymmetric cell had an energy density of 2.305 mWh cm−3 at a power density of 50 mW cm−3 and a capacitance retention of 92.25 % over 11 000 cycles and a very small diffusion resistance (1.72 Ω s−1/2). Thus, it is superior to most state‐of‐the‐art reported pseudocapacitors. The rationally designed nanostructured electrodes with high mass loading are likely to open up new opportunities for the development of a supercapacitor device capable of supplying higher energy and power.

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“…[30] The sharp C K-edge at around 284 eV and O K-edge at around 532 eV can be clearly identified (Figure 3g). [34] N 2 sorption isotherms of SS-CNR show a sharp increase in N 2 uptakes at a low relative pressure and a remarkable hysteresis loop in high-relative-pressure regions (0.5-1.0), indicating the existence of different pore sizes ranging from micropores to mesopores (Figure 3i; Figure S20, Supporting Information). The value of I G /I D is found to be about 0.88, implying the limited graphitization degree of SS-CNR (Figure 3h; Figure S19, Supporting Information).…”

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Fabrication of a Spherical Superstructure of Carbon Nanorods

et al. 2019

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superstructure with a large radius of curvature, such as spherical organization, is still a challenge. So far, only a few kinds of 1D oxides could be assembled into 3D spherical superstructures. [13][14][15] Low-dimensional carbon nanomaterials have been widely used in energy storage and conversion owing to their distinct electrochemical properties and mechanical and thermal stability. [16][17][18] 3D superstructures constructed from lowdimensional components such as carbon nanorods/wires or graphene nanorribbons can inherit the exceptional properties of their building blocks and acquire certain unconventional advantages. [19,20] However, the self-assemblies of 1D carbon nanomaterials into 3D ordered spherical superstructures are considerably challenging owing to the reduced accessible contact areas between the building blocks and core templates. Although various synthetic approches have been developed for the synthesis of lowdimensional carbon nanostructures with well-defined size and controllable composition, [21][22][23] no techniques have been applied for controlling the assembly of 1D carbon nanomaterials into 3D spherical superstructure with uniform morphology.Metal-organic frameworks (MOF) are a class of porous crystalline materials that are constructed by metal ions/clusters and organic linkers. [24] The use of MOF as a template or precursor to synthesize carbon nanostructure is an efficient approach to produce carbon materials with controlled morphology and Hierarchical superstructures in nano/microsize have attracted great attention owing to their wide potential applications. Herein, a self-templated strategy is presented for the synthesis of a spherical superstructure of carbon nanorods (SS-CNR) in micrometers through the morphology-preserved thermal transformation of a spherical superstructure of metal-organic framework nanorods (SS-MOFNR). The self-ordered SS-MOFNR with a chestnut-shell-like superstructure composed of 1D MOF nanorods on the shell is synthesized by a hydrothermal transformation process from crystalline MOF nanoparticles. After carbonization in argon, the hierarchical SS-MOFNR transforms into SS-CNR, which preserves the original chestnut-shell-like superstructure with 1D porous carbon nanorods on the shell. Taking the advantage of this functional superstructure, SS-CNR immobilized with ultrafine palladium (Pd) nanoparticles (Pd@SS-CNR) exhibits excellent catalytic activity for formic acid dehydrogenation. This synthetic strategy provides a facile method to synthesize uniform spherical superstructures constructed from 1D MOF nanorods or carbon nanorods for applications in catalysis and energy storage. 3D SuperstructuresHierarchical superstructures are ubiquitous in the biological systems (e.g., proteins, lipids, and carbohydrates). From the aspect of synthesis, self-assembly of simple building blocks into 3D, highly ordered superstructure with novel properties has attracted great interest in the fields of optics, catalysis, and energy storage. [1][2][3][4] Highly organized building bloc...

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Tungsten Nitride Nanodots Embedded Phosphorous Modified Carbon Fabric as Flexible and Robust Electrode for Asymmetric Pseudocapacitor

Cited by 84 publications

References 54 publications

Self‐Assembled Nickel Pyrophosphate‐Decorated Amorphous Bimetal Hydroxides 2D‐on‐2D Nanostructure for High‐Energy Solid‐State Asymmetric Supercapacitor

Self‐Assembled Nickel Pyrophosphate‐Decorated Amorphous Bimetal Hydroxides 2D‐on‐2D Nanostructure for High‐Energy Solid‐State Asymmetric Supercapacitor

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

Fabrication of a Spherical Superstructure of Carbon Nanorods

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