F-doped orthorhombic Nb2O5 exposed with 97% (100) facet for fast reversible Li+-Intercalation

Tang, Yufeng; Zhang, Dan; Liu, Guangyin; Luo, Xinwei; Zeng, Yi; Li, Xiu; Ma, Jianmin

doi:10.1016/j.gee.2022.09.009

Cited by 5 publications

(12 citation statements)

References 65 publications

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“…21 Second, Ni 2+ vacancies induce the generation of localized disorderly oriented domains, which improve the electronic conductivity (Figure S10) and favor the charge transfer. 46,70,74 Therefore, the redox reaction kinetics is facilitated, leading to enhanced rate performance. Third, the existence of Ni 2+ vacancies in the crystal lattice can expose more electrochemical reactive sites, increasing the contact area with the electrolyte and accordingly resulting in effective penetration of the electrolyte.…”

Section: Resultsmentioning

confidence: 99%

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Liu,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

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Transition-metal doping engineering is an important strategy to adjust the structures of electrode materials (i.e., nickel selenides) for supercapacitors (SCs), and there remain great challenges to seek rational methods for realizing systematical doping. Herein, based on the open-channel structures of Ni 0.85 Se and NiSe, a simple hydrothermal process combined with a universal ion exchange reaction was designed to fabricate Ni 0.85−x Se and NiSe nanoflowers doped by a series of 3d-transition-metal M 2+ ions (M = Co, Cu, and Zn). Structure, morphology, and spectroscopic characterizations as well as Rietveld refinement were employed to research the phases, morphologies, and compositions of Ni 0.85−x Se, NiSe, M x Ni 0.85−x Se, and M x Ni 1−x Se. It was demonstrated that the unique structures of Ni 0.85 Se and NiSe reduce the activation energies of M 2+ ions transported through the interstitial lattice position, and the formation of Ni 2+ vacancies decreases the steric hindrance of the insertion of divalent cations.Thus, Ni 2+ was easily substituted by M 2+ ions via cation exchange reaction at room temperature in water, realizing a 5−7% doping amount. Such transition-metal doping effects, from crystal structure modulation to electronic conductivity improvement, can effectively enhance the supercapacitor properties of Ni 0.85 Se and NiSe. The Co x Ni 1−x Se electrode delivers specific capacitances of 918.8, 770.5, 617.5, 496.9, and 437.5 F g −1 at 1, 2, 5, 7.5, and 10 A g −1 , respectively, which is the best among the eight electrodes. Besides, the "kick-out" cation exchange mechanism for the synthesis of M x Ni 0.85−x Se and M x Ni 1−x Se was discussed in detail. This work gives us feasible guidance to fabricate desired nickel selenides for SCs; moreover, the facile and universal cation exchange route can be expanded to purposefully design other cation-doped transition-metal selenides for energy storage.

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Section: Resultsmentioning

confidence: 99%

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Liu,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

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“…The plots of Z ′ vs ω –1/2 , which reflect the diffusion kinetics of lithium ions in the electrode materials, were drawn according to the data in the low-frequency region in Figure e and fitted according to the equation , Z ′ = R normale + R ct + σ ω − 1 / 2 …”

Section: Resultsmentioning

confidence: 99%

“…Finally, the Nyquist plots for the MoO 2 @mTiO 2 and bare MoO 2 electrodes were obtained for the intrinsic kinetic reaction mechanism, ,, as shown in Figure e. Both plots are semicircular in the high-frequency region and linear in the low-frequency region, from which the ohmic resistance ( R e ) and charge-transfer resistance ( R ct ) of the electrode materials could be obtained, as presented in Table S2.…”

Section: Resultsmentioning

confidence: 99%

“…The resistance values (R e and R ct ) of the MoO 2 @mTiO 2 electrode are lower than those of the bare MoO 2 electrode, indicating the easier and faster charge transfer for the former electrode. The plots of Z′ vs ω −1/2 , which reflect the diffusion kinetics of lithium ions in the electrode materials, were drawn according to the data in the low-frequency region in Figure 7e and fitted according to the equation 48,57…”

Section: Lithium Storage Performancementioning

confidence: 99%

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Thin and Uniform Mesoporous TiO₂-Wrapped MoO₂ Submicrospheres as Anode Materials for Enhanced Electrochemical Performances

Zhou

Bai

Mao

et al. 2023

ACS Appl. Eng. Mater.

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MoO2 has great potential for applications in rechargeable batteries, supercapacitors, and catalysis. However, its application for a long duration remains a challenge. Here, an effective strategy is presented to enhance its structural and chemical stability by wrapping a thin layer of porous oxide on MoO2 particles. Mesoporous TiO2-coated MoO2 (MoO2@mTiO2) submicrospheres are thus designed and controllably fabricated via kinetics-controlled coating and thermal treatment. The composite submicrosphere is built of a spherical MoO2 core and a thin amorphous mesoporous TiO2 shell with a tunable thickness, showing the enhanced structural and chemical stability. Their formation is attributed to the NH4 +-mediated tiny TiO2 nanoparticle deposition mechanism. Importantly, the MoO2@mTiO2-based electrode for lithium-ion batteries can maintain a high reversible capacity of up to ∼970 mAh g–1 at 1 A g–1 even after 380 cycles, which is much higher than that of the bare MoO2 microsphere-based electrode, exhibiting excellent cycling performance. Further experiments have revealed that there exists an optimal TiO2 shell thickness (about 12 nm), and overly thin or thick TiO2 shells are unfavorable to a long cycling performance with high capacity. In addition, this MoO2@mTiO2 electrode can always maintain a high reversible capacity of above 200 mAh g–1 at 1 A g–1 even after 1000 cycles for sodium-ion batteries, showing a good practical prospect. This study provides not only a facile route for the fabrication of MoO2@mTiO2 submicrospheres but also a potential electrode material with enhanced structural and chemical stability for lithium (or sodium)-ion batteries.

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“…Low electronic conductivity is a hindrance to improving the performance of batteries with Nb 2 O 5 anode. Liu et al 131 reported F‐doped Nb 2 O 5 microflowers with nearly 97% exposed (100) facets. Exposed (100) facets of Nb 2 O 5 anode enhance the intercalation performance through the Li‐ion transport along the loosely packed 4 g atomic layers.…”

Section: Facet Controlled Li‐ion Batteriesmentioning

confidence: 99%

Highly textured and crystalline materials for rechargeable Li‐ion batteries

et al. 2023

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To build an environment-friendly energy-based society, it is important to develop stable and high-performance batteries as an energy storage system. However, there are still unresolved challenges associated with safety issues, slow kinetics, and lifetime. To overcome these problems, it is essential to understand the battery systems including cathode, electrolyte, and anode. Using a well-controlled material system such as epitaxial films, textured films, and single crystals can be a powerful strategy to investigate the relationship between microstructural and electrochemical properties. In this review, we discuss the need for research with wellcontrolled materials system and recent progress in the well-controlled cathode, solid-state-electrolyte, and anode materials for Li-ion batteries. Enhanced stability and electrochemical performance due to the facilitation of prolonged and endured Li-ion transport in facet-controlled battery materials are highlighted. Finally, the challenges and future directions utilizing the well-controlled battery system for high-performance battery are proposed.

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F-doped orthorhombic Nb2O5 exposed with 97% (100) facet for fast reversible Li+-Intercalation

Cited by 5 publications

References 65 publications

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Thin and Uniform Mesoporous TiO₂-Wrapped MoO₂ Submicrospheres as Anode Materials for Enhanced Electrochemical Performances

Highly textured and crystalline materials for rechargeable Li‐ion batteries

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F-doped orthorhombic Nb2O5 exposed with 97% (100) facet for fast reversible Li+-Intercalation

Cited by 5 publications

References 65 publications

M2+-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

M2+-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Thin and Uniform Mesoporous TiO2-Wrapped MoO2 Submicrospheres as Anode Materials for Enhanced Electrochemical Performances

Highly textured and crystalline materials for rechargeable Li‐ion batteries

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Product

Resources

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M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Thin and Uniform Mesoporous TiO₂-Wrapped MoO₂ Submicrospheres as Anode Materials for Enhanced Electrochemical Performances