Molekulare Vanadiumoxide für Energiewandlung und Energiespeicherung: Derzeitige Trends und zukünftige Möglichkeiten

Anjass, Montaha; Lowe, Grace; Streb, Carsten

doi:10.1002/ange.202010577

“…hydrogels, nanofibers or stabilised metal nanoparticles) thanks to its amphiphilic character [33–35] . The decavanadate anion [V 10 O 28 ] 6− ( V 10 ) is among the most commonly studied polyoxovanadate species owing to its relatively simple synthesis and useful photo‐ and redox‐properties [36, 37] . Furthermore, its limited thermal stability (in comparison to W‐based clusters, for example) provides a straightforward route to the relatively low temperature thermal preparation of phase‐pure vanadium oxides [38] .…”

Section: Methodsmentioning

confidence: 99%

Self‐Assembled Surfactant‐Polyoxovanadate Soft Materials as Tuneable Vanadium Oxide Cathode Precursors for Lithium‐Ion Batteries

McNulty

¹

,

Penston

²

,

Amin

³

et al. 2023

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The mixing of [V 10 O 28 ] 6À decavanadate anions with a dicationic gemini surfactant (gem) leads to the spontaneous self-assembly of surfactant-templated nanostructured arrays of decavanadate clusters. Calcination of the material under air yields highly crystalline, sponge-like V 2 O 5 (gem-V 2 O 5 ). In contrast, calcination of the amorphous tetrabutylammonium decavanadate allows isolation of a more agglomerated V 2 O 5 consisting of very small crystallites (TBA-V 2 O 5 ). Electrochemical analysis of the materials' performance as lithium-ion intercalation electrodes highlights the role of morphology in cathode performance. The large crystallites and long-range microstructure of the gem-V 2 O 5 cathode deliver higher initial capacity and superior capacity retention than TBA-V 2 O 5 . The smaller crystallite size and higher surface area of TBA-V 2 O 5 allow faster lithium insertion and superior rate performance to gem-V 2 O 5 .

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A General Access Route to High‐Nuclearity, Metal‐Functionalized Molecular Vanadium Oxides

Greiner

¹

,

Hettig

²

,

Laws

³

et al. 2022

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Molecular metal oxides are key materials in diverse fields like energy storage and conversion, molecular magnetism and as model systems for solid‐state metal oxides. To improve their performance and increase the variety of accessible motifs, new synthetic approaches are necessary. Herein, we report a universal, new precursor to access different metal‐functionalized polyoxovanadate (POV) clusters. The precursor is synthesized by a novel solid‐state thermal treatment procedure. Solution‐phase test reactions at room temperature and pressure show that reaction of the precursor with various metal nitrate salts gives access to a range of metal‐functionalized POVs. The first nitrate‐templated molecular calcium vanadate cluster is reported. We show that this precursor could open new access routes to POV components for molecular magnetism, energy technologies or catalysis.

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Self‐Assembled Surfactant‐Polyoxovanadate Soft Materials as Tuneable Vanadium Oxide Cathode Precursors for Lithium‐Ion Batteries

McNulty

¹

,

Penston

²

,

Amin

³

et al. 2023

View full text Add to dashboard Cite

The mixing of [V 10 O 28 ] 6À decavanadate anions with a dicationic gemini surfactant (gem) leads to the spontaneous self-assembly of surfactant-templated nanostructured arrays of decavanadate clusters. Calcination of the material under air yields highly crystalline, sponge-like V 2 O 5 (gem-V 2 O 5 ). In contrast, calcination of the amorphous tetrabutylammonium decavanadate allows isolation of a more agglomerated V 2 O 5 consisting of very small crystallites (TBA-V 2 O 5 ). Electrochemical analysis of the materials' performance as lithium-ion intercalation electrodes highlights the role of morphology in cathode performance. The large crystallites and long-range microstructure of the gem-V 2 O 5 cathode deliver higher initial capacity and superior capacity retention than TBA-V 2 O 5 . The smaller crystallite size and higher surface area of TBA-V 2 O 5 allow faster lithium insertion and superior rate performance to gem-V 2 O 5 .

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Molekulare Vanadiumoxide für Energiewandlung und Energiespeicherung: Derzeitige Trends und zukünftige Möglichkeiten

Abstract: 2020 Die Autoren. Verçffentlicht von Wiley-VCH GmbH. Dieser Open Access Beitrag steht unter den Bedingungend er Creative Commons AttributionL icense, die jede Nutzung des Beitragesi n allen Medien gestattet, sofern der ursprüngliche Beitrag ordnungsgemäßzitiert wird.

Cited by 7 publications

References 146 publications

Self‐Assembled Surfactant‐Polyoxovanadate Soft Materials as Tuneable Vanadium Oxide Cathode Precursors for Lithium‐Ion Batteries

Self‐Assembled Surfactant‐Polyoxovanadate Soft Materials as Tuneable Vanadium Oxide Cathode Precursors for Lithium‐Ion Batteries

A General Access Route to High‐Nuclearity, Metal‐Functionalized Molecular Vanadium Oxides

Self‐Assembled Surfactant‐Polyoxovanadate Soft Materials as Tuneable Vanadium Oxide Cathode Precursors for Lithium‐Ion Batteries

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