All-Solid-State Supercapacitors Based on Flexible Co3O4 Nanoflowers/rGO Nanocomposites

Xiong, Zhihong; Hu, Po; Zhang, Yue; Cao, Fan; Wang, Dezhi; Sun, Chunwen; Hu, Yongming; Gu, Haoshuang

doi:10.1007/s11664-018-6479-z

Cited by 13 publications

(4 citation statements)

References 34 publications

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“…Substantial analysis and investigation are going on to establish an eco-friendly, earth-abundant, cost-effective, and new energy storage material having high specific capacity and energy density along with enhanced cyclability. Among different emerging energy storage technologies, the supercapacitor is the most promising technology because of its long cycle life, outstanding charge and discharge, and the potential to transfer more power than usual batteries, and also, favorable energy storage devices have high energy density for hybrid electric vehicles. , Supercapacitors have been attracting substantial recognition as a performance bridge gap between the high power density of an electrolytic capacitor and the high energy density of a battery . Based on the energy storage mechanism, they can be classified into two different sets, namely, electric double-layer capacitors (EDLCs) and pseudocapacitors.…”

Section: Introductionmentioning

confidence: 99%

Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties

et al. 2021

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Herein, overall improvement in the electrochemical performance of manganese dioxide is achieved through finetuning the microstructure of partially Co-doped manganese dioxide nanomaterial using facile hydrothermal method with precise control of preparative parameters. The structural investigation exhibits formation of a multiphase compound accompanied by controlled reflections of α-MnO 2 as well as γ-MnO 2 crystalline phases. The morphological examination manifests the presence of MnO 2 nanowires having a width of 70−80 nm and a length of several microns. The Co-doped manganese dioxide electrode displayed a particular capacitive behavior along with a rising order of capacitance concerning with increased cobalt ion concentration suitable for certain limits. The value of specific capacitance achieved by a 5% Co-doped manganese dioxide sample was 1050 F g −1 at 0.5 A g −1 , which was nearly threefold greater than that achieved by a bare manganese dioxide electrode. Furthermore, Co-doped manganese dioxide nanocomposite electrode exhibits exceptional capacitance retention (92.7%) till 10,000 cycles. It shows the good cyclability as well as stability of the material. Furthermore, we have demonstrated the solid-state supercapacitor with good energy and power density.

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Section: Introductionmentioning

confidence: 99%

Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties

et al. 2021

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“…This result is good among previously reported works with reliable flexibility. [ 55–59 ] It should be noted that SWCNT current collector is the top side during bending test so that the detached LFP particles can be removed from the electrode by gravity. As a sharp contrast, the Al‐based traditional electrodes break down typically around 100–200 cycles at the same ROC.…”

Section: Resultsmentioning

confidence: 99%

Binder‐Free Electrodes with High Energy Density and Excellent Flexibility Enabled by Hierarchical Configuration for Wearable Lithium Ion Batteries

Zhou

Xia

et al. 2021

Adv Materials Technologies

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There is strong demand for higher energy density and flexible lithium ion batteries recently. Unfortunately, electrodes built by conventional methods cannot meet these requirements simultaneously due to the large amount of inactive additives needed for sufficient flexibility. Herein, by utilizing a continuous single‐walled carbon nanotube reticulation and designing an all‐in‐one hierarchical configuration, binder‐free electrodes are fabricated via an in situ integration procedure. The electrode exhibits excellent electrochemical performance against up to 20 000 cycles of bending and high energy density (up to 493 Wh kg−1electrode and 820 Wh L−1electrode). The hierarchical configuration takes full diverse advantages of different carbon nanostructures. The as‐obtained novel binder‐free electrodes exhibit not only good cyclability (up to ≈90% capacity retentions after 1500 cycles) with only 4 wt% additive materials, but also show enhanced kinetic process, in comparison to those of traditional electrodes. Furthermore, based on the as‐designed electrodes, flexible cells are assembled and a practical wearable system is fabricated, manifesting that they can be used in a stable and flexible power supply for smart systems.

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“…As a result, RGO synthesized by chemical exfoliation methods deliver low energy and power compared to single-layer graphene. 22 The efforts to enhance the energy density of chemically synthesized RGO include increasing storage capacitance by reducing the number of layers, 23 introducing spacer between the graphene sheets, [24][25][26][27] heteroatom doping, [28][29][30][31][32][33] compositing with other classes of materials [34][35][36] and widening the potential window of operation. 37 Although the energy density of supercapacitors can be improved by enhancing the amount of charge stored and the cell voltage, 38 the most common strategy adopted is enhancing the charge storage capability of the electrode materials.…”

mentioning

confidence: 99%

Simultaneous Enhancement of Energy and Power Density of Reduced Graphene Oxide by the Effect of Dispersed Metal Oxide Nanoparticles in the Electrolyte

Bharathidasan

Subramaniam

Chandini

et al. 2020

J. Electrochem. Soc.

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Few-layered reduced graphene oxide (RGO) is prepared from graphite by chemical exfoliation method. In half cell, RGO electrode delivers a specific capacitance value of 41 mF cm−2 at 0.5 mA cm−2 in 1.0 M KOH. An attempt is made to improve the capacitance properties of RGO by widening the operating voltage window and improving the charge storage capability through the use of metal oxide nanoparticles as electrolyte additives. The specific capacitance of RGO increases to 62 mF cm−2 and 87 mF cm−2 when ZnO and SiOx nanoparticles were uniformly dispersed in the electrolyte, respectively, at 0.5 mA cm−2. For a power density of 1.5 mW cm−2, the symmetric supercapacitor assembled using ZnO and SiOx nanofluid electrolyte delivers an energy density of 2.6 μWh cm−2 and 3.03 μWh cm−2, respectively, which is 2.7 and 3.1 times the value of energy density obtained for symmetric supercapacitor assembled using KOH electrolyte. The nanofluid electrolytes show high stability even after 60 d and the electrochemical performance of RGO is reproducible in the aged nanofluid electrolytes. The RGO electrode shows stable cycling for the tested number of 10000 cycles in all the electrolytes.

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All-Solid-State Supercapacitors Based on Flexible Co3O4 Nanoflowers/rGO Nanocomposites

Cited by 13 publications

References 34 publications

Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties

Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties

Binder‐Free Electrodes with High Energy Density and Excellent Flexibility Enabled by Hierarchical Configuration for Wearable Lithium Ion Batteries

Simultaneous Enhancement of Energy and Power Density of Reduced Graphene Oxide by the Effect of Dispersed Metal Oxide Nanoparticles in the Electrolyte

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