Ultrathin MnO2 nanofibers grown on graphitic carbon spheres as high-performance asymmetric supercapacitor electrodes

Lei, Zhibin; Zhang, Jintao; Xin, Zhao

doi:10.1039/c1jm13872c

Cited by 558 publications

(324 citation statements)

References 52 publications

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“…Signifi cantly, the volumetric and specifi c capacitance of the solid-state device are comparable to the aqueous device. The solid-state ASC device achieved the maximum volumetric and specifi c capacitance of 0.71 F cm − 3 and 141.8 F g − 1 at 10 mV s − 1 , which are substantially higher than the values recently reported for graphene/ MnO 2 //activated carbon nanofi ber (78 F g − 1 ), [ 8 ] MnO 2 NW/ graphene//graphene (40 F g − 1 ), [ 15 ] and MnO 2 nanofi bers/ graphitic hollow carbon spheres//graphitic hollow carbon spheres (50 F g − 1 ) [ 13 ] at the same scan rate. Moreover, the solidstate ASC device shows good rate capacitance, with 56% of volumetric capacitance retained when the scan rate increased from 10 to 400 mV s − 1 .…”

Section: Doi: 101002/adma201203410contrasting

confidence: 52%

H‐TiO₂@MnO₂//H‐TiO₂@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

et al. 2012

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A flexible solid-state asymmetric supercapacitor device with H-TiO(2) @MnO(2) core-shell NWs as the positive electrode and H-TiO(2) @C core-shell NWs as the negative electrode is developed. This device operates in a 1.8 V voltage window and is able to deliver a high specific capacitance of 139.6 F g(-1) and maximum volumetric energy density of 0.30 mWh cm(-3) with excellent cycling performance and good flexibility.

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Section: Doi: 101002/adma201203410contrasting

confidence: 52%

H‐TiO₂@MnO₂//H‐TiO₂@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

et al. 2012

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“…2c and 2d). We noted that the density of MnO 2 was much higher in the present case than that grown on hollow carbon spheres (diameter of ~200 nm) [33], making the current nanostructure promising for higher energy storage capacity. The specific surface area of pure OLC was 377 m 2 g -1 as calculated by the Brunauer-Emmett-Teller (BET) method (Fig.…”

Section: Morphology and Structure Of The Olc/mno 2 Nano-urchinsmentioning

confidence: 87%

Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

Wang

Han

et al. 2013

Carbon

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A hybrid nano-urchin structure consisting of spherical onion-like carbon and MnO2 nanosheets is synthesized by a facile and environmentally-friendly hydrothermal method. Lithium-ion batteries incorporating the hybrid nano-urchin anode exhibit reversible lithium storage with superior specific capacity, enhanced rate capability, stable cycling performance, and nearly 100% Coulombic efficiency. These results demonstrate the effectiveness of designing hybrid nano-architectures with uniform and isotropic structure, high loading of electrochemically-active materials, and good conductivity for the dramatic improvement of lithium storage. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsWang, Y., Han, Z., Yu, S., Song, R., Song, H., Ostrikov, K. & Yang, H. (2013). Core-leaf onion-like carbon/ MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries. Carbon, 64 (November), [230][231][232][233][234][235][236] This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. IntroductionDeveloping high-performance rechargeable lithium-ion batteries (LIBs) is among the most promising solutions to address the drastic increase in global demand of energy [1]. LIBs were introduced to the market in the 1990s by Sony and soon attracted a strong research interest due to their high energy density, stability, and no memory effect, as compared to other alternatives [2]. However, commercial LIBs mostly use graphite as the anode material, which possesses a relatively low theoretical specific capacity of ~372 mAh g -1 . This low capacity severely hampers the wide usage of LIBs in the surging consumer electronic devices and the large-scale energy applications such as hybrid electric vehicles, renewable power plants, and load levelling [3][4][5]. To accommodate the high-level requirements of these advanced applications, it is imperative to explore new electrode materials and novel designs for higher energy density, lower cost, flexibility, non-toxicity, and better stability.The recent advances in nanotechnology have offered a promising route to tackle these challenges [6][7][8][9]. As compared to the bulk materials, nanostructured materials possess a large surface area with excellent electrical, optical, and mechanical properties. Nanomaterials can enhance the performance of LIBs through two approaches. The first one is by using lowdimensional carbon-based nanomaterials to provide more efficient lithiation and delithiation In this work we solve these problems by fabricating the hybrid nano-urchin structure consisting of onion-like carbon/MnO 2 (OLC/MnO 2 ) using a simple and environmentallybenign hydro...

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“…However, Raman spectrum of α-Fe 2 O 3 /C core-shell NRs exhibits some characteristic Raman peaks of α-Fe 2 O 3 at 225, 293 and 412 cm −1 along with two intense D and G bands at around 1352 and 1594 cm −1 , which further confirms uniform coating of graphitic-carbon on α-Fe 2 O 3 NRs to form α-Fe 2 O 3 /C core-shell NRs. 13,31 To investigate the valence states of Mn and Fe in the as-synthesized pristine and composite electrode materials, XAS and XPS measurements were performed as sensitive probes of the local structure and the valency. The high resolution X-ray absorption spectra at the Mn L edge and Fe L edge of MnO x , α-Fe 2 O 3 and α-Fe 2 O 3 /MnO x core-shell structures were collected at the BEAR beamline, Elettra Synchrotron Center, Italy.…”

Section: Resultsmentioning

confidence: 99%

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

Sarkar

Pal

Mandal

et al. 2017

J. Electrochem. Soc.

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A α-Fe 2 O 3 /MnO x core-shell nanorod (NR)-based positive electrode is designed combining the traits of α-Fe 2 O 3 and MnO x with an ultrathin MnO x shell serving as active site for surface or near-surface based fast and reversible faradaic-reactions and α-Fe 2 O 3 NR core facilitating electron transfer toward the current collector. The α-Fe 2 O 3 /MnO x core-shell NR electrode shows ameliorated electrochemical performance in terms of capacitance and rate capability within the potential window of 0-1 V in relation to both pristine α-Fe 2 O 3 NR electrode and pristine MnO x thin film electrode. Similarly, α-Fe 2 O 3 /C core-shell NR negative electrode is also realized. The assembled α-Fe 2 O 3 /C//α-Fe 2 O 3 /MnO x core-shell NR asymmetric supercapacitor (ASC) exhibits a volumetric capacitance of ∼ 1.28 F/cm 3 at a scan rate of 10 mV/s with nearly 78% capacitance retention at the scan rate of 400 mV/s within a potential window of 0-2 V in aqueous electrolyte medium. Interestingly, the ASC delivers a maximum energy-density of ∼ 0.64 mWh/cm 3 and a maximum power-density of 155 mW/cm 3 , which are higher than the values obtained for α- By 2050, global electrical energy demand is likely to reach 28 TW.1,2 Production of such a humungous amount of carbonneutral energy would necessitate the exploitation of renewable energy sources, like solar and wind.3,4 Furthermore, electrical energy storage would be required for unimpaired integration of electricity generated from these sources to the grid. For large-scale electrochemical storage to be viable, the materials used and devices produced need to be costeffective, besides being long-lasting and safe. Indeed, high specific energy and high power densities are of lesser concern in this regard. Accordingly, chemistries that make use of aqueous electrolytes are favorable candidates for large scale energy storage. It is noteworthy that as the renewable energy resources are intermittent, it would be desirable to store the energy from these sources as quickly as possible.Recently, supercapacitors (SCs) have emerged as a new class of storage devices that can be charged quickly with higher powerdensities than storage batteries. [5][6][7] However, their energy densities still remain limited and there is a definite need to increase it to cope with the global energy demand for electric traction and nextgeneration portable electronic devices. 8 The energy density of supercapacitors can be enhanced by increasing their capacitance as well as their operating-potential window, which can be achieved more easily with asymmetric supercapacitors (ASCs) than with the symmetric supercapacitors (SSCs) since, with suitable combination of positive and negative electrode materials, the operational potential window as high as 2 V has been achieved even with aqueous electrolytes. 6,[9][10][11][12][13][14] In recent years, efforts have been expended to explore several ASCs with different electrode materials based on redox-active transition-metal oxides, like RuO 2 ,

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Ultrathin MnO2 nanofibers grown on graphitic carbon spheres as high-performance asymmetric supercapacitor electrodes

Cited by 558 publications

References 52 publications

H‐TiO₂@MnO₂//H‐TiO₂@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

H‐TiO₂@MnO₂//H‐TiO₂@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

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Ultrathin MnO2 nanofibers grown on graphitic carbon spheres as high-performance asymmetric supercapacitor electrodes

Cited by 558 publications

References 52 publications

H‐TiO2@MnO2//H‐TiO2@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

H‐TiO2@MnO2//H‐TiO2@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

α-Fe2O3-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe2O3/C//α-Fe2O3/MnOxAsymmetric Supercapacitor

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H‐TiO₂@MnO₂//H‐TiO₂@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

H‐TiO₂@MnO₂//H‐TiO₂@C Core–Shell Nanowires for High Performance and Flexible Asymmetric Supercapacitors

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor