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

Chodankar, Nilesh R.; Dubal, Deepak P.; Ji, Su‐Hyeon; Kim, Do‐Heyoung

doi:10.1002/smll.201901145

Cited by 86 publications

(46 citation statements)

References 49 publications

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“…Here, we selectedasolution-based process because it produces auniform and conformal activematerial over the substrate. In the preparation of MoS 2 @CF nanosheets,s odium molybdate and thiourea were used as the sources of Mo and S. MnO 2 nanosheets were prepared over a period of 24 ho nt he CF by using KMnO 4 and HCl at 120 8C. Details regarding the synthesis of MoS 2 @CF and MnO 2 @CF nanosheets are provided in the Supporting Information (section SI 1).…”

Section: Resultsmentioning

confidence: 99%

“…Over the past couple of decades, SCs have been used as active energy storage devices for many electronic applications because of their useful features, including excellent power capability, long cycle life, low production cost, and eco‐friendly nature. Yet, their lower energy storing capacity than LIBs is a major obstacle for their extensive application . Currently available SCs on the market are carbon‐based and have high power capability and excellent cycle life; however, their energy density is low because of the limited energy storing ability .…”

Section: Introductionmentioning

confidence: 99%

“…Yet, their lower energy storing capacity than LIBs is am ajor obstacle fort heir extensive application. [4][5][6] Currently availableS Cs on the market are carbon-based and have high power capability and excellent cycle life;h owever,t heir energy density is low because of the limited energy storing ability. [7] In literature, different approaches have been discussed for enhancing the energy-storage capacity of SCs while keeping all other features of the SCs the same.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Recently, fiber-type flexible supercapacitors have been extensively studied due to the fast and steady progress in the portable/wearable electronics [8,9]. Till now, one-dimensional supercapacitors have been mostly studied based on fiber/yarn, cable, and wire as a current collector because of the high flexibility, small size, lightweight, and easy to fabricate in wearable devices [10,11].…”

Section: Introductionmentioning

confidence: 99%

CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

Cho¹,

Seong²,

Noh³

et al. 2020

Preprint

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In this work, we report the carbon fiber-based wire-type asymmetric supercapacitors (ASCs). The highly conductive carbon fibers were prepared by the carbonized and graphitized process using the polyimide (PI) as a carbon fiber precursor. To assemble the ASC device, the CoMnO2-coated and Fe2O3-coated carbon fibers were used as the cathode and the anode materials, respectively. FE-SEM analysis confirmed that the CoMnO2-coated carbon fiber electrode exhibited the porous hierarchical interconnected nanosheet structures, depending on the added amounts of ammonium persulfate (APS) as an oxidizing agent, and Fe2O3-coated carbon fiber electrode showed a uniform distribution of porous Fe2O3 nanorods over the surface of carbon fibers. The nanostructured CoMnO2 were directly deposited onto carbon fibers by a chemical oxidation route without high temperature treatments. In particular, the electrochemical properties of the CoMnO2-coated carbon fiber with the concentration of 6 mmol APS presented the enhanced electrochemical activity, probably due to its porous morphologies and good conductivity. Further, to reduce the interfacial contact resistance as well as improve the adhesion between transition metal nanostructures and carbon fibers, the carbon fibers were pre-coated with the Ni layer as a seed layer using an electrochemical deposition method. The fabricated ASC device delivered a specific capacitance of 221 F g-1 at 0.7 A g-1 and good rate capability of 34.8% at 4.9 A g-1. Moreover, the wire-type device displayed the superior energy density of 60.16 Wh kg-1 at a power density of 490 W kg-1 and excellent capacitance retention of 95% up to 3,000 charge/discharge cycles.

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“…Recently,e xcellent TM compounds including TM sulfides, phosphides,n itrides,a nd selenides,p roduced through ion exchange and Kirkendall effects, have been developed to overcome these challenges. [13][14][15] In particular, transition metal selenides (TMSs) have shown extraordinary electrochemical activities and high electricalc onductivity,b oth of which facilitate charge transfer in the electrochemical process. [16] As ar esult, TMSs with 3D configuration have been extensively applied in Li/Na-ion batteries, [17] electrocatalysis, [18] and solar cells.…”

Section: Introductionmentioning

confidence: 99%

Porous Ultrathin NiSe Nanosheet Networks on Nickel Foam for High‐Performance Hybrid Supercapacitors

Zhao

et al. 2019

ChemSusChem

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Transition metal selenides (TMSs) with excellent electrochemical activity and high intrinsic electrical conductivity have attracted considerable attention owing to their potential use in energy storage devices. However, the low energy densities of the reported TMSs, which originate from the small active surface area and poor electrolyte ion mobility, substantially restrict their application potential. In this work, porous ultrathin nickel selenide nanosheet networks (NiSe NNs) on nickel foam are fabricated by using a novel, facile method, that is, selenylation/pickling of the pre‐formed manganese‐doped α‐Ni(OH)2. Removal of Mn resulted in NNs with a highly porous structure. The 3D framework of the NNs and the inherent nature of the NiSe affords high ion mobility, abundant accessible activated sites, vigorous electrochemical activity, and low resistance. One of the highest specific capacities of TMSs ever reported, that is, 443 mA h g−1 (807 μAh cm−2) at 3.0 A g−1, is achieved with the NNs as electrodes. The assembled NiSe NNs//porous carbon hybrid supercapacitor delivers a high energy density of 66.6 Wh kg−1 at a power density of 425 W kg−1, with excellent cycling stability. This work provides a new strategy for the production of novel electrode materials that can be applied in high‐performance hybrid supercapacitors, and a fresh pathway towards commercial applications of hybrid supercapacitors based on TMS electrodes.

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

Cited by 86 publications

References 49 publications

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

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

CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

Porous Ultrathin NiSe Nanosheet Networks on Nickel Foam for High‐Performance Hybrid Supercapacitors

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