Charge Carrier Accumulation in Lithium Fluoride Thin Films due to Li-Ion Absorption by Titania (100) Subsurface

Li, Chilin; Gu, Lin; Guo, Xiangxin; Samuelis, Dominik; Tang, Kun; Maier, Joachim

doi:10.1021/nl203623h

Cited by 65 publications

(42 citation statements)

References 34 publications

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“…The discharge capacity remained on the very high value of 1600 mA h g −1 after 40 cycles with high average Coulombic efficiency. As shown in this image, the specific capacity of Co 9 S 8 ‐based electrode is larger than its theoretical value, which may be ascribed to the reversible solid‐electrolyte interface (SEI) layer formation and the interface storage of such high porous and hollow carbon nanocages in the current HCSP⊂GCC . Cycling test of HCSP⊂GCC anode at different current densities (increased from 100 to 3000 mA g −1 ) with working voltage of 0.01–3.0 V also show that they exhibit excellent rate capability as anode materials (Figure c,d).…”

Section: Resultsmentioning

confidence: 55%

“…As shown in this image, the specifi c capacity of Co 9 S 8 -based electrode is larger than its theoretical value, which may be ascribed to the reversible solid-electrolyte interface (SEI) layer formation and the interface storage of such high porous and hollow carbon nanocages in the current HCSP⊂GCC. [ 8,27,38 ] Cycling test of HCSP⊂GCC anode at different current densities (increased from 100 to 3000 mA g −1 ) with working voltage of 0.01-3.0 V also show that they exhibit excellent rate capability as anode materials (Figure 7 c,d). Remarkably, at a high current density of 1000 mA g −1 , this material still delivers high and ultrastable reversible capacities of about 1300 mA h g −1 in the whole 350 cycles (Figure 7 e), which is much superior than previous reported cobalt sulfi de-based anodes (Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 94%

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MOF‐Derived Hollow Co₉S₈ Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

Liu

Xiao

et al. 2016

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Novel electrode materials consisting of hollow cobalt sulfide nanoparticles embedded in graphitic carbon nanocages (HCSP⊂GCC) are facilely synthesized by a top-down route applying room-temperature synthesized Co-based zeolitic imidazolate framework (ZIF-67) as the template. Owing to the good mechanical flexibility and pronounced structure stability of carbon nanocages-encapsulated Co9 S8 , the as-obtained HCSP⊂GCC exhibit superior Li-ion storage. Working in the voltage of 1.0-3.0 V, they display a very high energy density (707 Wh kg(-1) ), superior rate capability (reversible capabilities of 536, 489, 438, 393, 345, and 278 mA h g(-1) at 0.2, 0.5, 1, 2, 5, and 10C, respectively), and stable cycling performance (≈26% capacity loss after long 150 cycles at 1C with a capacity retention of 365 mA h g(-1) ). When the work voltage is extended into 0.01-3.0 V, a higher stable capacity of 1600 mA h g(-1) at a current density of 100 mA g(-1) is still achieved.

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Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 94%

MOF‐Derived Hollow Co₉S₈ Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

Liu

Xiao

et al. 2016

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322

144

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“…Ionic transport at interfaces of fluoride‐based heterostructures has been studied in detail . It is ascertained that interfaces play a crucial role in promoting ion mobility.…”

Section: Resultsmentioning

confidence: 99%

Buried Interfaces Effects in Ionic Conductive LaF₃–SrF₂ Multilayers

Koshmak

Banshchikov

Ciancio

et al. 2017

Adv Materials Inter

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Solid-state materials that express enhanced ionic transport properties at the nanoscale attract an increasing interest.In multiphase/multilayer solid electrolytes, the composition, reactivity, and structure of interfaces between materials and phases play a fundamental role for fast ion-conduction. Here, the properties of buried interfaces in prototypical fast ion-conducting LaF 3 /SrF 2 epitaxial multilayers are investigated. Photoelectron spectroscopy-both with soft-X and high-energy photons-is applied to separate composition and reactivity of buried interfaces with respect to the outermost surface. X-ray reflectivity, high-energy electron diffraction, X-ray diffraction, atomic force and transmission electron microscopies are used to study morphology, layer crystallinity, epitaxy relations, and buried interface structure. It is found that while the alternated layers present good crystallinity and high lattice matching, with formation of almost ideal sharp interfaces, buried interfaces show a sizeable reduction of the energy barrier for F vacancy formation with respect to bare materials. A density higher by a factor of six of fluorine vacancies is observed at buried interfaces in multilayers with respect to the bare materials. This is correlated to the formation of space charge regions, favoring ion conduction. The formation of F depleted La fluoride regions at interfaces is also promoted by annealing. This is associated to the increase of ion conductivity in annealed heterostructures reported in literature.Applications span from energy and data storage in miniaturized systems to sensoristics. [1][2][3][4] Enhancement of conductivity by several orders of magnitude has been observed in epitaxial multilayer structures [5][6][7] and ascribed to interfacerelated nanoscale effects. Crystal structure, defects, chemical composition, and electronic band structure of interfaces between ionic conductors in a multiphase system, like a multilayer, are crucial aspects to consider in order to understand, and to control, the ionic conduction phenomena.Here we focus our attention on the chemical reactivity at interfaces between materials with different (ion) conducting properties. For this purpose, heterostructures based on alternate layers of LaF 3 and SrF 2 have been chosen.Fluorides represent prototypical systems. Their simple crystal structure makes them ideal for fundamental studies on the conduction mechanisms. Good ionic conductors such as LaF 3 are highly responsive toward irradiation and temperature modifications [8] which can be explained by high mobility of the lattice ions. Multilayer/ multiphase materials based on LaF 3 further foster the ionic

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“…59 Although the limited resolution of the methods employed in the present studies (HR-STEM) for anions did not allow for the direct quantification of the V •• O across the interface, it is worth mentioning that the formation of a space-charge zone due to ionic transfer has already been reported in the literature in systems such as BaF 2 /CaF 2 or LiF/TiO 2 . 9,60,61 As far as oxygen defects are concerned, it was only demonstrated for grain boundaries. 6,10,[62][63][64] Lastly, one should also consider that a certain role in the definition of the interface functionalities could be played by nonidealities stemming e.g.…”

Section: Discussionmentioning

confidence: 99%

High-temperature superconductivity at the lanthanum cuprate/lanthanum–strontium nickelate interface

et al. 2018

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The utilization of interface effects in epitaxial systems at the nanoscale has emerged as a very powerful approach for engineering functional properties of oxides. Here we present a novel structure fabricated by a state-of-the-art oxide molecular beam epitaxy method and consisting of lanthanum cuprate and strontium (Sr)-doped lanthanum nickelate, in which interfacial high-temperature superconductivity (Tc up to 40 K) occurs at the contact between the two phases. In such a system, we are able to tune the superconducting properties simply by changing the structural parameters. By employing electron spectroscopy and microscopy combined with dedicated conductivity measurements, we show that decoupling occurs between the electronic charge carrier and the cation (Sr) concentration profiles at the interface and that a hole accumulation layer forms, which dictates the resulting superconducting properties. Such effects are rationalized in the light of a generalized space-charge theory for oxide systems that takes account of both ionic and electronic redistribution effects.

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Charge Carrier Accumulation in Lithium Fluoride Thin Films due to Li-Ion Absorption by Titania (100) Subsurface

Cited by 65 publications

References 34 publications

MOF‐Derived Hollow Co₉S₈ Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

MOF‐Derived Hollow Co₉S₈ Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

Buried Interfaces Effects in Ionic Conductive LaF₃–SrF₂ Multilayers

High-temperature superconductivity at the lanthanum cuprate/lanthanum–strontium nickelate interface

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Charge Carrier Accumulation in Lithium Fluoride Thin Films due to Li-Ion Absorption by Titania (100) Subsurface

Cited by 65 publications

References 34 publications

MOF‐Derived Hollow Co9S8 Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

MOF‐Derived Hollow Co9S8 Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

Buried Interfaces Effects in Ionic Conductive LaF3–SrF2 Multilayers

High-temperature superconductivity at the lanthanum cuprate/lanthanum–strontium nickelate interface

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Product

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MOF‐Derived Hollow Co₉S₈ Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

MOF‐Derived Hollow Co₉S₈ Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

Buried Interfaces Effects in Ionic Conductive LaF₃–SrF₂ Multilayers