Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity

Hu, Zhiquan; He, Qiu; Liu, Ziang; Liu, Xiong; Qin, Mingsheng; Wen, Bo; Shi, Wenchao; Zhao, Yan; Li, Qi; Mai, Liqiang

doi:10.1016/j.scib.2020.04.011

Cited by 69 publications

(48 citation statements)

References 58 publications

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“…Other articles reported for Nb 2 O 5 calcined at T< 500 °C a pseudohexagonal structure called the TT-Nb 2 O 5 phase (ICDD no. 00-028-0317, lattice constants: c = 3.94 Å and a = 3.64 Å (space group: P6/mmm); then, after increasing the temperature up to 600 °C, the structure became orthorhombic [ 46 ]. On the other hand, the orthorhombic (T-Nb 2 O 5 ) and pseudohexagonal (TT-Nb 2 O 5 ) phases are difficult to distinguish in terms of structure.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural in Aqueous Medium over Nb2O5-Based Catalysts

et al. 2021

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The catalytic dehydration of fructose to 5-hydroxymethylfurfural (HMF) in water was performed in the presence of pristine Nb2O5 and composites containing Nb and Ti, Ce or Zr oxides. In all experiments, fructose was converted to HMF using water as the solvent. The catalysts were characterized by powder X-ray diffraction, scanning electron microscopy, N2 physical adsorption, infrared and Raman spectroscopy and temperature-programmed desorption of NH3. Experimental parameters such as fructose initial concentration, volume of the reacting suspension, operation temperature, reaction time and amount of catalyst were tuned in order to optimize the catalytic reaction process. The highest selectivity to HMF was ca. 80% in the presence of 0.5 g·L−1 of bare Nb2O5, Nb2O5-TiO2 or Nb2O5-CeO2 with a maximum fructose conversion of ca. 70%. However, the best compromise between high conversion and high selectivity was reached by using 1 g·L−1 of pristine Nb2O5. Indeed, the best result was obtained in the presence of Nb2O5, with a fructose conversion of 76% and a selectivity to HMF of 75%, corresponding to the highest HMF yield (57%). This result was obtained at a temperature of 165° in an autoclave after three hours of reaction by using 6 mL of 1 M fructose suspension with a catalyst amount equal to 1 g·L−1.

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Section: Resultsmentioning

confidence: 99%

Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural in Aqueous Medium over Nb2O5-Based Catalysts

et al. 2021

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“…Recent studies have shown that combining H-Nb 2 O 5 with conductive materials such as a carbon coating layer or a conductive NbO 2 phase can remarkably enhance the rate capability and cycling stability. 72,73 Interestingly, another medium-temperature phase, M-Nb 2 O 5 has recently been shown to display similar cyclic voltammetric characteristics and high initial capacity at small discharge currents comparable to H-Nb 2 O 5 ; while its high rate capability and cycling stability outperform those of H-Nb 2 O 5 , and are even better than those of T-Nb 2 O 5 74,75.…”

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confidence: 99%

Niobium pentoxide based materials for high rate rechargeable electrochemical energy storage

Shen

Sun

et al. 2021

Mater. Horiz.

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“…Surface‐limited kinetics are possible when the overall rate is not limited by diffusive processes and there is an absence of a crystallographic phase changes upon intercalation [22–26] . Numerous nanoscale niobia structures have been reported with an emphasis on individual performance metrics [27–74] . A few investigations have approached the relationship between nanostructure and T‐Nb 2 O 5 performance using computational models, [75] advanced electrochemical techniques, [76] tunable nanotubes, [77] and core‐shell particles [78,79] without experimentally isolating the rate‐limiting process(es).…”

Section: Introductionmentioning

confidence: 99%

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Bergh

Wechsler

Lokupitiya

et al. 2022

Batteries & Supercaps

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Intercalation pseudocapacitance can combine capacitor‐like power densities with battery‐like energy densities. Such surface‐limited behavior requires rapid diffusion where amorphization can increase solid‐state diffusivity. Here intercalation pseudocapacitive materials with tailored extents of amorphization in T‐Nb2O5 are first reported. Amorphization was characterized with WAXS, XPS, XAFS, and EPR which suggested a peroxide‐rich (O22−) surface that was consistent with DFT predictions. A series of tunable isomorphic architectures enabled comparisons while independently varying transport parameters. Through process of elimination, solid‐state lithium diffusion was identified as the dominant diffusive‐constraint dictating the maximum voltage sweep rate for surface‐limited kinetics (vSLT), termed the Surface‐Limited Threshold (SLT). The vSLT increased with amorphization however stable cycling required crystalline T‐Nb2O5. A current‐response model using series‐impedances well‐matched these observations. This perspective revealed that amorphization of T‐Nb2O5 enhanced solid‐state diffusion by 12.2 % and increased surface‐limitations by 17.0 % (stable samples). This approach enabled retaining 95 % lithiation capacity at ∼800 mV s−1 (1,600 C‐rate equivalent).

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Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity

Cited by 69 publications

References 58 publications

Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural in Aqueous Medium over Nb2O5-Based Catalysts

Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural in Aqueous Medium over Nb2O5-Based Catalysts

Niobium pentoxide based materials for high rate rechargeable electrochemical energy storage

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

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Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity

Cited by 69 publications

References 58 publications

Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural in Aqueous Medium over Nb2O5-Based Catalysts

Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural in Aqueous Medium over Nb2O5-Based Catalysts

Niobium pentoxide based materials for high rate rechargeable electrochemical energy storage

Amorphization of Pseudocapacitive T−Nb2O5 Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

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Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures