Template‐Based Engineering of Carbon‐Doped Co<sub>3</sub>O<sub>4</sub> Hollow Nanofibers as Anode Materials for Lithium‐Ion Batteries

Yan, Chunshuang; Chen, Gang; Zhou, Xin; Sun, Jian; Lv, Chade

doi:10.1002/adfm.201504695

Cited by 421 publications

(225 citation statements)

References 72 publications

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“…For the Co spectra (Figure 1 b), the two dominating peaks, Co 2p 3/2 and Co 2p 1/2 , are in good agreement with those reported for Co 3 O 4 . [13] The relatively weak (negligible) satellite peaks in the XPS spectra of Co 3 O 4 confirms its characteristic spinel structure, with Co 3+ cations occupying octahedral lattice sites and Co 2+ cations in tetrahedral sites. The emergence of well-defined satellite peaks (at 787.3 and about 803.2 eV) in the CoN-1 min sample is consistent with the breakdown of the spinel structure after nitrogen plasma exposure and the presence of Co II , which indicates the presence of cobalt oxide/ hydroxide which is unavoidably formed upon atmospheric exposure.…”

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confidence: 72%

Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low‐Cost Catalysts for Oxygen Evolution

et al. 2016

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Electrochemical splitting of water to produce hydrogen and oxygen is an important process for many energy storage and conversion devices. Developing efficient, durable, low-cost, and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is of great urgency. To achieve the rapid synthesis of transition-metal nitride nanostructures and improve their electrocatalytic performance, a new strategy has been developed to convert cobalt oxide precursors into cobalt nitride nanowires through N 2 radio frequency plasma treatment. This method requires significantly shorter reaction times (about 1 min) at room temperature compared to conventional high-temperature NH 3 annealing which requires a few hours. The plasma treatment significantly enhances the OER activity, as evidenced by a low overpotential of 290 mV to reach a current density of 10 mA cm À2 , a small Tafel slope, and longterm durability in an alkaline electrolyte.The oxygen evolution reaction (OER) is one of the key processes for many energy storage and conversion devices, such as hydrogen production from water splitting, regenerative fuel cells, and rechargeable metal-air batteries. [1] The intrinsic thermodynamic "up-hill" reaction require extra potential to drive the water splitting reaction. To increase the reaction rate and decrease the energy consumption, efficient catalysts with low over-potentials are required to boost this process. [2] Although an excellent OER performance has been achieved for noble metal (Ir and Ru) based materials, the relative scarcity and high cost of these metals renders their application for this purpose unsustainable. [3] Thus, a key goal has been to search for new OER catalytic materials with low over-potential, superior stability, and low cost. Transition-metal nitrides have attracted enormous attention as a result of their high chemical

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confidence: 72%

Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low‐Cost Catalysts for Oxygen Evolution

et al. 2016

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“…Due to the strong reaction between nickel ions and silica, they first coated a uniform layer of mesoporous silica on the surface of the functionalized CNTs to form CNT@SiO 2 @NiSilicate core‐double shell 1D nanostructure. Subsequently, the NiSilicate nanosheets were converted into Ni 3 S 2 nanosheets by a chemical conversion route with Na 2 S. The hierarchical CNT/Co 3 O 4 microtubes, carbon‐doped Co 3 O 4 hollow nanofibers and N‐doped carbon@CoS coaxial nanotubes have been fabricated by using electrospun PAN nanofibers as the template. Yan et al prepared carbon‐doped Co 3 O 4 hollow nanofibers by using PAN nanofibers.…”

Section: Advantages and Synthetic Routes Of 1d Nanostructured Materialsmentioning

confidence: 99%

“…Subsequently, the NiSilicate nanosheets were converted into Ni 3 S 2 nanosheets by a chemical conversion route with Na 2 S. The hierarchical CNT/Co 3 O 4 microtubes, carbon‐doped Co 3 O 4 hollow nanofibers and N‐doped carbon@CoS coaxial nanotubes have been fabricated by using electrospun PAN nanofibers as the template. Yan et al prepared carbon‐doped Co 3 O 4 hollow nanofibers by using PAN nanofibers. In the fabrication process, PAN nanofibers not only was used as template but also taken as the carbon resource.…”

Section: Advantages and Synthetic Routes Of 1d Nanostructured Materialsmentioning

confidence: 99%

1D Nanomaterials: Design, Synthesis, and Applications in Sodium–Ion Batteries

Jin

Han

Wang

et al. 2017

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Sodium-ion batteries (SIBs) have received extensive attention as ideal candidates for large-scale energy storage systems (ESSs) owing to the rich resources and low cost of sodium (Na). However, the larger size of Na and the less negative redox potential of Na /Na result in low energy densities, short cycling life, and the sluggish kinetics of SIBs. Therefore, it is necessary to develop appropriate Na storage electrode materials with the capability to host larger Na and fast ion diffusion kinetics. 1D materials such as nanofibers, nanotubes, nanorods, and nanowires, are generally considered to be high-capacity and stable electrode materials, due to their uniform structure, orientated electronic and ionic transport, and strong tolerance to stress change. Here, the synthesis of 1D nanomaterials and their applications in SIBs are reviewed. In addition, the prospects of 1D nanomaterials on energy conversion and storage as well as the development and application orientation of SIBs are presented.

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“…The additional peak located at 283.5 eV can be ascribed to the formation of CoC bond between metallic cobalt and GC. [24] The higher O ΙΙ ratio of CoO x @ GCS⊃Co indicates that it possesses more oxygen vacancies than Co⊂Co 3 O 4 ⊂GCS and Co 3 O 4 @GCS ( Figure 2b). [14] Without assistance of molten salt, the CoC bond is absent ( Figure S14, Supporting Information).…”

mentioning

confidence: 99%

“…The O 1s spectra can be deconvoluted into three different peaks of metal oxide (O Ι 529.7 eV), defect sites with a low oxygen coordination (O ΙΙ 531.2 eV), and hydroxyl groups (532.4 eV). The Raman spectrum of pure Co 3 O 4 exhibits four characteristic peaks at 188, 480, 516, and 685 cm −1 , corresponding to F 2g 1 CoO 6 scissoring vibration, E g , F 2g 2 , and A 1g symmetric stretching CoO vibration modes of the crystalline Co 3 O 4 , [24] respectively ( Figure 2d). This can be explained by the filling of sufficient oxygen into the latter two samples annealed in the air.…”

mentioning

confidence: 99%

Heterogeneous Molten Salt Design Strategy toward Coupling Cobalt–Cobalt Oxide and Carbon for Efficient Energy Conversion and Storage

Yan

Zhu

Fang

et al. 2018

Advanced Energy Materials

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To overcome their intrinsic limitations, a promising strategy is to construct hybrids composed of cobalt-based species and carbon materials. 2D graphitic carbon (GC) matrix with large surface area, high electrical conductivity, and robust mechanical stability is an excellent candidate in this regard. [7] Beyond planar integrated hybrids, an encapsulated structure of metallic nanoparticles within GC layer can be very effective in tuning activity and improving durability. In this configuration, metal electrons would transfer to carbon, which creates rich reactive sites and tunes electronic properties of the carbon materials, consequently accelerating electron/charge transfer kinetics. [8][9][10][11] It should be emphasized that the effective charge transfer is achieved via the formation of strong bridged bonds, which are absent in conventional carbon hybrids. Typically, metal-organic frameworks (MOFs) are chosen as carbon source to build the encapsulated structures. Nonetheless, they still suffer from poor contact between carbon and metallic nanoparticles. [12] Moreover, the morphologies of MOF-derived carbon matrixes are limited largely to polyhedrons similar to that of the parent structures. [13] Thus, to introduce the bridged bonds and maximize the exposed active sites, structure and morphology of Co-based hybrids need to be rationally designed and achieved in a controlled manner. [14] In addition, synthetic route toward encapsulated structure with bridged bonds must be facile to realize scalable synthesis for practical application.Molten salt (MS) synthesis is a relatively simple and economical method to prepare various inorganic materials, in which MS is used as a reaction medium. For those solvent-based synthetic routes, solvation is a crucial step. However, molecular solvents hardly solvate inorganics like metals and oxides. The strong polarizing force of MSs can reduce the stabilization of metallic, ionic, or covalent bonds -a pool of ionized cations and anions. Thus, MS method is a powerful synthetic strategy allowing the access to a broad range of inorganic crystalline materials, as well as carbons. [15] Careful design of synthesis conditions (composition of molten salt, raw materials, etc.) can enable the regulation for the structure, morphology, and composition of the resulting material.Here, we designed a strongly coupled hybrid consisting of embedded cobalt oxide nanocrystals and encapsulated cobalt nanoparticles on graphitic carbon nanosheet (GCS), denoted as CoO x @GCS⊃Co, via a volatile organic salt-induced Strong coupling between non-noble metal and carbon materials that enables fast electrochemical reaction kinetics is highly desired in many energy-related applications. Herein, a volatile organic salt-induced heterogeneous molten salt method is proposed to couple embedded cobalt oxide nanocrystals and encapsulated cobalt nanoparticles on a 2D graphitic carbon matrix, featuring enhanced charge transport and increased exposed active sites. Originating from its unique structure, this hybrid delivers...

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Template‐Based Engineering of Carbon‐Doped Co₃O₄ Hollow Nanofibers as Anode Materials for Lithium‐Ion Batteries

Cited by 421 publications

References 72 publications

Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low‐Cost Catalysts for Oxygen Evolution

Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low‐Cost Catalysts for Oxygen Evolution

1D Nanomaterials: Design, Synthesis, and Applications in Sodium–Ion Batteries

Heterogeneous Molten Salt Design Strategy toward Coupling Cobalt–Cobalt Oxide and Carbon for Efficient Energy Conversion and Storage

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Template‐Based Engineering of Carbon‐Doped Co3O4 Hollow Nanofibers as Anode Materials for Lithium‐Ion Batteries

Cited by 421 publications

References 72 publications

Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low‐Cost Catalysts for Oxygen Evolution

Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low‐Cost Catalysts for Oxygen Evolution

1D Nanomaterials: Design, Synthesis, and Applications in Sodium–Ion Batteries

Heterogeneous Molten Salt Design Strategy toward Coupling Cobalt–Cobalt Oxide and Carbon for Efficient Energy Conversion and Storage

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Template‐Based Engineering of Carbon‐Doped Co₃O₄ Hollow Nanofibers as Anode Materials for Lithium‐Ion Batteries