Redox-inactive ions control the redox-activity of molecular vanadium oxides
Simon Greiner1,2, Benjamin Schwarz1, Mark Ringenberg3
1Institute of Inorganic Chemistry I, Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany carsten.streb@uni-ulm.de.
Chemical Science
|June 14, 2021
Summary
Functionalizing polyoxovanadates with calcium ions significantly enhances their electron storage capacity. This breakthrough improves materials for energy conversion and storage applications like lithium-ion cathodes.
Area of Science:
- Materials Science
- Electrochemistry
- Inorganic Chemistry
Background:
- Polyoxometalates (POMs) are crucial for energy applications due to their tunable properties.
- Vanadium oxides, a type of POM, exhibit electrochemical reactivity relevant to energy storage.
Purpose of the Study:
- To investigate the impact of redox-inert cation functionalization on polyoxovanadate electron storage.
- To compare the electrochemical performance of Ca2+-functionalized dodecavanadate with its precursor.
Main Methods:
- Synthesis and characterization of Ca2+-functionalized dodecavanadate ({CaV}) and precursor ({V}).
- Electrochemical performance testing, including redox transition analysis and application in lithium-ion cathodes.
Main Results:
- The Ca2+-functionalized {CaV} cluster demonstrated significantly enhanced electron storage, up to five electrons per cluster.
- {V} precursor exhibited only one reversible redox transition.
- {CaV} showed promise as an active material in lithium-ion cathodes.
Conclusions:
- Redox-inert cations like Ca2+ can act as effective structural and electrostatic stabilizers in polyoxovanadates.
- Functionalization with Ca2+ dramatically alters the redox chemistry and electron storage capabilities of polyoxovanadates.
- This strategy offers a pathway to develop advanced materials for energy storage.
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