Oxygen defected T-Nb2O5-x confined in necklace-like N-doped carbon fibers for Li+/Na+ capacitor

Lian, Yue; Zheng, Yujing; Bai, Yongqing; Wang, Dawei; Yan, Haishui; Wang, Zhifeng; Zhao, Jing; Zhang, Huaihao

doi:10.1016/j.jpowsour.2021.230267

Cited by 29 publications

(13 citation statements)

References 42 publications

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“…This phenomenon comes from the protection of the carbon tube, which reduces the direct contact area between Nb 2 O 5 and the electrolyte, thus relieves the lattice misalignment caused by defective structure. [17] The CV curves of N-Nb 2 O 5-x @CNTs (Figure 5B) at various current rates keep high similarity, showing good rate capability. Moreover, the redox potential of N-Nb 2 O 5-x @CNTs (Figure 5B) remains basically unchanged, while that of N-Nb 2 O 5-x @C (Figure S10, Supporting Information) demonstrates significant deviation.…”

Section: Li-half Cellmentioning

confidence: 84%

“…[27] 2) CNTs, as the transmission medium of positive charge carrier, relieve the destruction of the Nb 2 O 5 lattice by Li + and the irreversible reaction. [17] 3) CNTs, as the phase transfer channel of the microsphere, ensures the synchronous transmission of ions and electrons under different current densities, which can quickly reach the bulk phase of the microsphere for energy storage reaction. The improvement of Nb 2 O 5 conductivity by CNTs and lattice defects is predictable, also consistent with EIS tests (Figure 6D).…”

Section: Li-half Cellmentioning

confidence: 99%

“…[14][15][16] Also, shortening the ion transport path and enhancing its electrochemical activity are important means to further boost its performance. [17,18] In this work, the highly stabilized microsphere N-Nb 2 O 5-x @CNTs, using carbon nanotubes (CNTs) as framework and Nb 2 O 5 as filler, was constructed by spray drying. With the capillary effect, [19] the CNTs intersecting the microsphere phase ensure ions/electrons contact bulk phase at fast and stable speed during the storage process.…”

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confidence: 99%

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Multidefect N‐Nb₂O_5‐_x@CNTs Incorporated into Capillary Transport Framework for Li⁺/Na⁺ Storage

Lian

Zheng

Wang

et al. 2022

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As an ion‐embedded material with small strain and low transport energy barrier, the limited ion transport rate and conductivity of niobium pentaoxide (Nb2O5) are the main factors limiting its application in lithium/sodium storage systems. In this work, the microsphere composites (N‐Nb2O5‐x@CNTs) are prepared by combining Nb2O5, rich in nitrogen doping and vacancy defects, with carbon nanotubes (CNTs) penetrating the bulk phase. With the capillary effect, CNTs can enable the rapid electrolyte infiltration into the microspheres, thus shorting the Li+/Na+ transport path. In addition, CNTs also hinder the direct contact between the electrolyte and Nb2O5, and inhibit the irreversible reaction. Meanwhile, nitrogen doping and oxygen vacancy defects reduce the energy barrier of Li+/Na+ transport, and improve their transport rate, proved by density functional theory. Highly conductive CNTs and unpaired electrons from defects also ameliorate the insulation property of Nb2O5. Therefore, N‐Nb2O5‐x@CNTs display good electrochemical performance in both Li/Na half‐cell and Li/Na hybrid capacitors. Interestingly, kilogram‐scale microsphere composites can be produced in laboratory conditions by using industrial grade raw materials, implying its potential for practical application.

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Section: Li-half Cellmentioning

confidence: 84%

Section: Li-half Cellmentioning

confidence: 99%

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confidence: 99%

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Multidefect N‐Nb₂O_5‐_x@CNTs Incorporated into Capillary Transport Framework for Li⁺/Na⁺ Storage

Lian

Zheng

Wang

et al. 2022

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“…13 On the other hand, chemical reagents (such as pore-forming agents and templates) used in the aforementioned process are difficult to be removed completely, thus causing great harm to the environment. 14,15 Therefore, the design of a simple, green, and controllable preparation approach is the target of biomass-derived carbon development. 16 In this work, an eco-friendly recyclable route to synthesize two-dimensional (2D) biomass-derived carbon nanosheets (NBC) with N, B codoping is developed by employing pomacea canaliculata egg as the precursor (an exotic invasive species in China).…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, their preparation process mostly involves toxic reagents and harsh reaction conditions, which usually leads to poor control of the morphology of the obtained materials . On the other hand, chemical reagents (such as pore-forming agents and templates) used in the aforementioned process are difficult to be removed completely, thus causing great harm to the environment. , Therefore, the design of a simple, green, and controllable preparation approach is the target of biomass-derived carbon development …”

Section: Introductionmentioning

confidence: 99%

Noncorrosive and Nonpolluting Synthesis of Biomass-Derived Nanosheets with B, N Codoping

Lian

Liu

Bao

et al. 2022

ACS Appl. Energy Mater.

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The green synthesis of biomass multifunction carbon is a major research direction within the carbon field. In this work, double-ion codoped two-dimensional (2D) carbon nanosheets, derived from biomass by recyclable boric acid templates, are prepared as supercapacitor electrode materials. Here, biomacromolecules from pomacea canaliculata egg (an exotic invasive species in China) self-assemble uniformly on the surface of H 3 BO 3 plates by hydrogen bonding, thus forming a precursor with a sandwich structure. Subsequently, gas from the H 3 BO 3 pyrolysis further inflates the resultant carbon material to 2D-shaped ultrathin nanosheets and also to acquire the carbon material (NBC) after simple water-washing. NBC has the following advantages: (1) N, B codoping changes the electron distribution of the carbon lattice, enhancing the electrochemical activity and conductivity; (2) abundant and uniformly distributed active sites are produced on the carbon nanosheet surface due to the full contact between boric acid (as both the template and doping source) and the biomass precursor; (3) the reagent used in this work (H 3 BO 3 ) can be recycled and used repeatedly without pollution to the environment, achieving the closed-loop usage of chemical reagents. Compared with the traditional alkaline activation method, this work has a better prospect in view of material stability, preparation difficulty, and environmental protection. In terms of performance, the NBC//NBC delivers an energy density of 8.2 Wh kg −1 and a maximum power density of 2500 W kg −1 . Besides, NBC//NBC preserves about 92.3% high specific capacitance after 10 4 cycles, meaning its splendid stability.

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Anode Materials for Sodium‐Ion Capacitors

Zou,

Deng,

Hou

et al. 2023

Sodium Ion Capacitors

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Oxygen defected T-Nb2O5-x confined in necklace-like N-doped carbon fibers for Li+/Na+ capacitor

Cited by 29 publications

References 42 publications

Multidefect N‐Nb₂O_5‐_x@CNTs Incorporated into Capillary Transport Framework for Li⁺/Na⁺ Storage

Multidefect N‐Nb₂O_5‐_x@CNTs Incorporated into Capillary Transport Framework for Li⁺/Na⁺ Storage

Noncorrosive and Nonpolluting Synthesis of Biomass-Derived Nanosheets with B, N Codoping

Anode Materials for Sodium‐Ion Capacitors

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Oxygen defected T-Nb2O5-x confined in necklace-like N-doped carbon fibers for Li+/Na+ capacitor

Cited by 29 publications

References 42 publications

Multidefect N‐Nb2O5‐x@CNTs Incorporated into Capillary Transport Framework for Li+/Na+ Storage

Multidefect N‐Nb2O5‐x@CNTs Incorporated into Capillary Transport Framework for Li+/Na+ Storage

Noncorrosive and Nonpolluting Synthesis of Biomass-Derived Nanosheets with B, N Codoping

Anode Materials for Sodium‐Ion Capacitors

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Product

Resources

About

Multidefect N‐Nb₂O_5‐_x@CNTs Incorporated into Capillary Transport Framework for Li⁺/Na⁺ Storage

Multidefect N‐Nb₂O_5‐_x@CNTs Incorporated into Capillary Transport Framework for Li⁺/Na⁺ Storage