ChemInform Abstract: A New Zinc Pyrovanadate, Zn3 (OH)2V2O7×2H2O, from X‐Ray Powder Data.

Zavalij, Peter Y.; Zhang, F.; Whittingham, M. S.

doi:10.1002/chin.199811013

Cited by 6 publications

(11 citation statements)

References 1 publication

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“…XRD and Raman spectra were recorded at different charging/discharging potentials of the MVS2 electrode after the completion of five numbers of GCD cycles. At a 1.57 V discharge potential, the MVS2 electrode shows characteristic peaks at 16.9, 20.68, 33.76, and 35.6° for Zn 3 (OH) 2 V 2 O 7 ·2H 2 O (JCPDS 50-0570). ,,,, The additional peaks at 16.15 and 17.3° are assigned to the VS 4 material . The corresponding peak becomes intense during discharging and weakens after full charging.…”

Section: Resultsmentioning

confidence: 91%

A Reversible Anodizing Strategy in a Hybrid Electrolyte Zn-Ion Battery through Structural Modification of a Vanadium Sulfide Cathode

Samanta

Ghosh

Jang

et al. 2021

ACS Appl. Energy Mater.

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Rechargeable aqueous Zn-ion batteries (ZiBs) have received significant attention owing to their low cost and environmental friendliness. The charge storage mechanism of ZiBs generally depends on the cationic redox conversion. The anodic redox conversion is still rare due to the lack of suitable cathode materials and electrolytes, which may impede the ZiB performance. The present investigation focuses on enhancing the ZiB performance through in situ involvement of disulfide redox chemistry from a patronite Mn-doped VS4 crystal in a 1 M Zn(OTf)2 water/acetonitrile (ACN) hybrid electrolyte. Simultaneous involvement of cationic and anionic redox conversion during the charging/discharging process enhances the specific capacity as high as ∼547 mA h g–1 at 0.2 A g–1 current density. The water/ACN hybrid solvent effectively improves the working voltage and suppresses Zn dendrite formation, resulting in superior cycling performance. The conversion of the VS4 crystal phase and intercalation of H+/Zn2+ in the cathode have been investigated through ex situ X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman studies.

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Section: Resultsmentioning

confidence: 91%

A Reversible Anodizing Strategy in a Hybrid Electrolyte Zn-Ion Battery through Structural Modification of a Vanadium Sulfide Cathode

Samanta

Ghosh

Jang

et al. 2021

ACS Appl. Energy Mater.

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“…The remaining site is surrounded by V–O–V pillars (V 2 O 7 4– group, gray, Figure S1). And the OH – groups form hydrogen bonds to the water molecules that fill cavities in the porous framework. , The products display polygonal even round plate-like morphologies and uniform distribution (Figure b,d). Each nanoplate has a planar size in the range of 400–500 nm and its thickness is ∼100 nm.…”

Section: Resultsmentioning

confidence: 99%

Zinc Pyrovanadate Nanoplates Embedded in Graphene Networks with Enhanced Electrochemical Performance

Niu

Han

et al. 2016

Ind. Eng. Chem. Res.

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Transition metal vanadates have gradually caputured reseachers' attention as anode materials for lithium ion batteries, because of their high specific capacity and relatively high chemical stability. However, they suffer from low rate performance and short cycling performance because of the intrinsic low electronic conductivity and large volume variation during lithiation and delithiation. Here we report a design of zinc pyrovanadate nanoplates embedded in graphene networks through a facile one-pot hydrothermal method. Benefiting from graphene and zinc pyrovanadate nanoplates, this nanocomposite possesses high specific capacity, excellent rate capability, and superior cycling stability. Particularly, it exhibits a high reversible capacity of 902 mA h g −1 at 500 mA g −1 , maintaining 854 mA h g −1 after 400 cycles. The impressive electrochemical performance makes it a promising anode material for lithium ion batteries.

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“…The EDX elemental mapping images (Figure e) show a uniform distribution of these elements Zn, V, and O in these plates, further demonstrating that they are ZVO. As noted in the previous literature, the ZVO is composed of zinc oxide layers pillared by V–O–V (V 2 O 7 4– groups), and H 2 O molecules fill in the big cavities (the inset of Figure c). The open layered structure with water-lubricated channels can improve Zn 2+ diffusion .…”

Section: Results and Discussionmentioning

confidence: 56%

“…The OH – ions were adsorbed on the surface of the cathode due to electrostatic interaction. Then, the V 5+ reacted with the superficial OH – , Zn 2+ , and H 2 O to form the ZVO plates (2 V 5+ + 2OH – + 3Zn 2+ + 9H 2 O → Zn 3 V 2 O 7 (OH) 2 ·2H 2 O + 14H + ) . However, with the exhaustion of V 5+ in the system, the concentration of OH – increases, which leads to the formation of ZHS byproducts .…”

Section: Results and Discussionmentioning

confidence: 99%

Doping-Induced Static Activation of MnO₂ Cathodes for Aqueous Zn-Ion Batteries

Ren

et al. 2021

ACS Sustainable Chem. Eng.

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Electrochemical activation has been confirmed to be a powerful strategy to improve the Zn2+ storage activity of MnO2-based cathodes. A pivotal challenge of electrochemical activation is the poor cycling stability of activated cathodes upon Zn2+ (de)intercalation due to the dissolution of active materials in the electrolyte, the structural degeneration of pristine cathode materials, and the complicated dynamic electrochemical process. In this study, we report a novel doping-induced static activation method to induce the formation of active Zn3V2O7(OH)2·2H2O (ZVO) on the surface of a highly V-doped MnO2 (VMO) cathode by simply placing the cathode in an aqueous ZnSO4 electrolyte for 10 days. Our method not only significantly improves the Zn2+ storage activity of the pristine VMO cathode but also successfully tackles these problems of electrochemical activation. The activated cathode (VMO/ZVO) delivers a significantly increased initial capacity of 262 mA h g–1 and a high capacity retention of 99% after 100 cycles based on a H+/Zn2+ synergetic pseudocapacitive mechanism. The proposed static activation strategy holds great potential in the fabrication of high-activity cathodes for aqueous Zn-ion batteries.

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ChemInform Abstract: A New Zinc Pyrovanadate, Zn₃ (OH)₂V₂O₇×2H₂O, from X‐Ray Powder Data.

Cited by 6 publications

References 1 publication

A Reversible Anodizing Strategy in a Hybrid Electrolyte Zn-Ion Battery through Structural Modification of a Vanadium Sulfide Cathode

A Reversible Anodizing Strategy in a Hybrid Electrolyte Zn-Ion Battery through Structural Modification of a Vanadium Sulfide Cathode

Zinc Pyrovanadate Nanoplates Embedded in Graphene Networks with Enhanced Electrochemical Performance

Doping-Induced Static Activation of MnO₂ Cathodes for Aqueous Zn-Ion Batteries

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ChemInform Abstract: A New Zinc Pyrovanadate, Zn3 (OH)2V2O7×2H2O, from X‐Ray Powder Data.

Cited by 6 publications

References 1 publication

A Reversible Anodizing Strategy in a Hybrid Electrolyte Zn-Ion Battery through Structural Modification of a Vanadium Sulfide Cathode

A Reversible Anodizing Strategy in a Hybrid Electrolyte Zn-Ion Battery through Structural Modification of a Vanadium Sulfide Cathode

Zinc Pyrovanadate Nanoplates Embedded in Graphene Networks with Enhanced Electrochemical Performance

Doping-Induced Static Activation of MnO2 Cathodes for Aqueous Zn-Ion Batteries

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ChemInform Abstract: A New Zinc Pyrovanadate, Zn₃ (OH)₂V₂O₇×2H₂O, from X‐Ray Powder Data.

Doping-Induced Static Activation of MnO₂ Cathodes for Aqueous Zn-Ion Batteries