The microdefects and enhanced electrochemical performances of nano-VO2(B) induced by Mg doping

Liu, Dewei; Zhang, Qijie; Chen, Xiaohong; Li, Hui; Yan, Fufeng; Hirata, Dai; Li, Tao; Xue, Rongjian; Chen, Jing; Gong, Gaoshang; Shang, Cui; Zhai, Xuezhen

doi:10.1007/s10008-022-05327-3

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…The V 2p spectrum of the VOx (Figure 2c) exhibits two major peaks of V 2p1/2 and V 2p3/2 spin orbits, which can be further revolved into four peaks. Among them, the peaks at 516.7 and 524.1 eV are assigned to V 4+ , while those at 518.1 and 525.5 eV correspond to V 5+ [41,42], confirming the coexistence of the VO2 and V3O7•H2O composites. After coating with the PANI layer, the valences of the V species are consistent except for several shifts in the binding energies for V 4+ (516.9 and 524.2 eV) and V 5+ (517.8 and 525.1 eV).…”

Section: Electrochemical Performancesmentioning

confidence: 81%

PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor

Zhang,

Li,

Zheng

et al. 2023

Micromachines

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As a typical pseudocapacitor material, VOx possesses mixed valence states, making it an ideal electrode material for symmetric screen-printed supercapacitors. However, its high internal resistance and low energy density are the main hurdles to its widespread application. In this study, a two-dimensional PANI@VOx nanobelt with a core-shell architecture was constructed via a two-step route. This strategy involves the preparation of VOx using a solvothermal method, and a subsequent in situ polymerization process of the PANI. By virtue of the synergistic effect between the VOx core and the PANI shell, the optimal VOx@PANI has an enhanced conductivity of 0.7 ± 0.04 S/Ω, which can deliver a high specific capacitance of 347.5 F/g at 0.5 A/g, a decent cycling life of ~72.0%, and an outstanding Coulomb efficiency of ~100% after 5000 cycles at 5 A/g. Moreover, a flexible all-solid-state symmetric supercapacitor (VOx@PANI SSC) with an in-planar interdigitated structure was screen-printed and assembled on a nickel current collector; it yielded a remarkable areal energy density of 115.17 μWh/cm2 at an areal power density of 0.39 mW/cm2, and possessed outstanding flexibility and mechanical performance. Notably, a “Xiaomi” hygrothermograph (3.0 V) was powered easily by tandem SSCs with an operating voltage of 3.1 V. Therefore, this advanced pseudocapacitor material with core-shell architecture opens novel ideas for flexible symmetric supercapacitors in powering portable/wearable products.

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Section: Electrochemical Performancesmentioning

confidence: 81%

PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor

Zhang,

Li,

Zheng

et al. 2023

Micromachines

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“…VO 2 (B) powder is then obtained by redox reaction at higher temperature. The morphology of the products prepared with different raw materials and reaction conditions varies greatly, mainly nanowires, 38 nanosheets, 39 nanorods, 40 nanoribbons, 41 nanoflowers, 42 nanoparticles, 43 etc . In a study by Fangan Liang et al , 20 VO 2 (B) nanosheets were synthesized via a one-step hydrothermal method, as depicted in Fig.…”

Section: Crystal Structure and Synthesis Of Vo2mentioning

confidence: 99%

One-dimensional tunnel VO₂(B) cathode materials for high-performance aqueous zinc ion batteries: a mini review of recent advances and future perspectives

Kou,

Wang,

Song

et al. 2024

Green Chem.

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Co‐Substitution Engineering Boosting the Kinetics and Stablity of VO₂ for Zn Ion Batteries

Wang,

Cui,

Wang

et al. 2024

Adv Funct Materials

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VO2 is considered as one of the most likely cathode materials to be commercialized for large‐scale application in AZIBs and is at the forefront of aqueous batteries, but its lower electrical conductivity, slower Zn2+ mobility, as well as voltage degradation and structural collapse due to vanadium solubilization have limited its further development. Herein, a Co‐substitution engineering strategy is proposed, which is introducing heteroatom Co2+ doping substitution and oxygen vacancy substitution to stabilize structure and promote ionic/electronic conductivity, leading an enhanced Zn ion storage behavior. The Co‐substituted VO2 (Co0.03V0.97O2‐x, denote as Ov‐CoVO) is reported in this paper, Co‐substitution inhibits vanadium dissolution of VO2 in AZIBs, even in the acetionitrile system. DFT calculations show that Ov‐CoVO has a more stable structure as well as a faster electronic/ionic conductivity. Consequently, the Ov‐CoVO||ZnOTF||Zn battery (aqueous) can deliver a remarkable capacity of 475 mAh g−1 at 0.2 A g−1 with 99.1% capacity retention after 200 cycles, still maintains excellent cycling stability in Ov‐CoVO||ZnTFSI||Zn (acetionitrile electrolyte) at 0.1 A g−1. In addition, compared to VO2, the charge transfer resistance and Zn2+ iffusion coefficient of Ov‐CoVO are significantly enhanced. This work broadens the scope for research cathode materials for high performance ZIBs.

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The microdefects and enhanced electrochemical performances of nano-VO2(B) induced by Mg doping

Cited by 6 publications

References 34 publications

PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor

PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor

One-dimensional tunnel VO₂(B) cathode materials for high-performance aqueous zinc ion batteries: a mini review of recent advances and future perspectives

Co‐Substitution Engineering Boosting the Kinetics and Stablity of VO₂ for Zn Ion Batteries

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The microdefects and enhanced electrochemical performances of nano-VO2(B) induced by Mg doping

Cited by 6 publications

References 34 publications

PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor

PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor

One-dimensional tunnel VO2(B) cathode materials for high-performance aqueous zinc ion batteries: a mini review of recent advances and future perspectives

Co‐Substitution Engineering Boosting the Kinetics and Stablity of VO2 for Zn Ion Batteries

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Product

Resources

About

One-dimensional tunnel VO₂(B) cathode materials for high-performance aqueous zinc ion batteries: a mini review of recent advances and future perspectives

Co‐Substitution Engineering Boosting the Kinetics and Stablity of VO₂ for Zn Ion Batteries