Synthesis of ZnO quantum dot/graphene nanocomposites by atomic layer deposition with high lithium storage capacity

Sun, Xiang; Zhou, Changgong; Xie, Ming; Sun, Hongtao; Hu, Tao; Lu, Fengyuan; Scott, Spencer; George, Steven M.; Lian, Jie

doi:10.1039/c4ta00589a

Cited by 120 publications

(80 citation statements)

References 73 publications

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“…[48] The anodic curves display two peaks, in which the peak at 0.51 V is related to the multi-step de-alloying process of Li-Zn alloy, and the broad peak at 1.37 V is related to the formation of ZnO according to the redox reaction between Zn and Li 2 O. [49,50] Therefore, the overall reaction process of ZnO UNPs@HPCNFs in LIBs could be described as Equations 1, 2:…”

Section: Resultsmentioning

confidence: 99%

General Synthesis of Transition Metal Oxide Ultrafine Nanoparticles Embedded in Hierarchically Porous Carbon Nanofibers as Advanced Electrodes for Lithium Storage

Xia

Zhang

Fang

et al. 2016

Adv Funct Materials

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X. (2016). General synthesis of transition metal oxide ultrafine nanoparticles embedded in hierarchically porous carbon nanofibers as advanced electrodes for lithium storage. Advanced Functional Materials, 26 (34),[6188][6189][6190][6191][6192][6193][6194][6195][6196] General synthesis of transition metal oxide ultrafine nanoparticles embedded in hierarchically porous carbon nanofibers as advanced electrodes for lithium storage AbstractA unique general, large-scale, simple, and cost-effective strategy, i.e., foaming-assisted electrospinning, for fabricating various transition metal oxides into ultrafine nanoparticles (TMOs UNPs) that are uniformly embedded in hierarchically porous carbon nanofibers (HPCNFs) has been developed. Taking advantage of the strong repulsive forces of metal azides as the pore generator during carbonization, the formation of uniform TMOs UNPs with homogeneous distribution and HPCNFs is simultaneously implemented. The combination of uniform ultrasmall TMOs UNPs with homogeneous distribution and hierarchically porous carbon nanofibers with interconnected nanostructure can effectively avoid the aggregation, dissolution, and pulverization of TMOs, promote the rapid 3D transport of both Li ions and electrons throughout the whole electrode, and enhance the electrical conductivity and structural integrity of the electrode. As a result, when evaluated as binder-free anode materials in Li-ion batteries, they displayed extraordinary electrochemical properties with outstanding reversible capacity, excellent capacity retention, high Coulombic efficiency, good rate capability, and superior cycling performance at high rates. More importantly, the present work opens up a wide horizon for the fabrication of a wide range of ultrasmall metal/metal oxides distributed in 1D porous carbon structures, leading to advanced performance and enabling their great potential for promising largescale applications. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsXia, G., Zhang, L., Fang, F., Sun, D., Guo, Z., Liu, H. & Yu, X. (2016) A unique general, large-scale, simple, and cost-effective strategy, i.e., foaming-assisted electrospinning, for fabricating various transition metal oxides into ultrafine nanoparticles (TMOs UNPs) that are uniformly embedded in hierarchically porous carbon nanofibers (HPCNFs) has been developed. Taking advantage of the strong repulsive forces of metal azides as the pore generator during carbonization, the formation of uniform TMOs UNPs with homogeneous distribution and HPCNFs was simultaneously implemented. The combination of uniform ultra-small TMOs UNPs with homogeneous distribution and hierarchically porous carbon nanofibers with interconnected nanostructure could effectively avoid the aggregation, dissolution, and pulverization of TMOs, promote the rapid three-dimensional transport of both Li ions and electrons throughout the whole electrode, and enhance the electrical conductivity and structural integrity of the electrode. As a result, when evaluated as ...

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Section: Resultsmentioning

confidence: 99%

General Synthesis of Transition Metal Oxide Ultrafine Nanoparticles Embedded in Hierarchically Porous Carbon Nanofibers as Advanced Electrodes for Lithium Storage

Xia

Zhang

Fang

et al. 2016

Adv Funct Materials

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“…For example, zinc oxide (ZnO) has attracted attention due to low cost, highly electrical conductivity (1 S cm À1 ), nontoxicity, and high theoretical capacity ($978 mAh g À1 ) [9][10][11][12]. However, a severe volume change ($228%) during the charge-discharge processes has been observed for ZnO [13]. Several approaches have been carried out to minimize the large mechanical deformation and showed improved electrochemical performance.…”

Section: Introductionmentioning

confidence: 98%

“…Wang and coworkers reported a uniform dispersion of ZnO nanoparticles ($10 nm diameter) into a porous carbon bubble host, greatly inhibiting aggregation of ZnO, accompanying with the enhanced rate capability with capacity up to 190 mAh g À1 at a current density of 49 A g À1 [15]. Furthermore, graphene has been introduced to combine with ZnO quantum dots with controllable sizes ranging from 2 to 7 nm, greatly mitigating the severe capacity fade of ZnO, which can be ascribed to the excellent mechanical properties of graphene and the ultra-small ZnO quantum dots [13]. The morphology of ZnO has been optimized for LIBs, such as nanorods and nanoflowers with prolonged cycling performance [16][17][18].…”

Section: Introductionmentioning

confidence: 98%

ZnO decorated TiO2 nanosheet composites for lithium ion battery

Gao

Huang

et al. 2015

Electrochimica Acta

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“…Most notably, Sun et al had reported for coatings of ZnO quantum dots as Li-ion battery anode material. ZnO quantum dots of various sizes from 2 to 7 nm were homogeneously coated along the curvature of graphene sheets through atomic layer deposition technique (one of the PVD method) [66]. A high reversible specific capacity of 960 mAh g À1 at a current density of 100 mA g À1 is achieved for 2 nm ZnO quantum [67].…”

Section: Coatings For Batteriesmentioning

confidence: 99%

Coatings for Energy Applications

Keshri

Sribalaji

2015

Thin Film Structures in Energy Applications

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This chapter aims at providing an understanding about the potential applications of various types of coatings in energy sector. As the energy demands are growing day by day, there is need of enhancing the efficiency of energy systems, which can be enhanced using the advanced coatings. This chapter summarizes about the application of thin films and thick coatings of conventional/nanomaterials in both renewable and non-renewable energy sectors. A comparison between the efficiencies of systems with and without coatings has also been addressed. The importance and challenges associated with adding nanomaterials like carbon nanotubes (CNT), graphene, and various nanostructures with conventional coating material have also been discussed. This chapter can lead to better fundamental understanding about the coatings, which ensures new designs, high efficiency, and large application of coatings in energy sector. IntroductionEnergy has been the part of our life, especially electricity plays a vital role in our modern society. With an ever-increasing population, energy demand also growing faster for the past few decades. To meet the increased demand, every country has started to explore different energy systems to produce and store electricity in an efficient and most importantly in the eco-friendly way [1]. Hence, by increasing energy production, emission of greenhouse gases like carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O) also rises to its peak. In order to decrease the emission of greenhouse gases, a worldwide initiation has also been in progress. Energy conservation steps have been introduced, either by reducing CO 2 emission from non-renewable sources like coal, natural gas, petroleum, and nuclear sources; or by avoiding such emissions using renewable energy sources as wind, water, sunlight, or biomass.

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Synthesis of ZnO quantum dot/graphene nanocomposites by atomic layer deposition with high lithium storage capacity

Abstract: Uniform ZnO QDs with controllable sizes from 2 to 7 nm on graphene were synthesized. The ZnO QD/graphene nanocomposites show enhanced electrochemical properties as lithium ion battery anodes.

Cited by 120 publications

References 73 publications

General Synthesis of Transition Metal Oxide Ultrafine Nanoparticles Embedded in Hierarchically Porous Carbon Nanofibers as Advanced Electrodes for Lithium Storage

General Synthesis of Transition Metal Oxide Ultrafine Nanoparticles Embedded in Hierarchically Porous Carbon Nanofibers as Advanced Electrodes for Lithium Storage

ZnO decorated TiO2 nanosheet composites for lithium ion battery

Coatings for Energy Applications

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