Effects of electrolyte doping on electrodeposited nanostructured manganese oxide and chromium oxide
Electrolyte additions are used to control the functionality of a nanostructured oxide. Dopant ions affect the size and shape of deposit crystallites and modify the host structure. Such ions can be incorporated into the deposit or form a separate oxide phase. The manganese dioxide family of polymorph...
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Veröffentlicht in: | Surface & coatings technology 2020-10, Vol.400, p.126211, Article 126211 |
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Sprache: | eng |
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Zusammenfassung: | Electrolyte additions are used to control the functionality of a nanostructured oxide. Dopant ions affect the size and shape of deposit crystallites and modify the host structure. Such ions can be incorporated into the deposit or form a separate oxide phase. The manganese dioxide family of polymorphs with ion-molecular sieve properties represents the additional possibilities of “template” effects of dopant ions on the phase composition, heterovalent substitution in the cationic sublattice, changes in morphology and alteration of nanocrystallite size during electrocrystallisation. The effects of electrolyte doping in electrodeposited, non-stoichiometric manganese dioxide (NH4+, Li+ and Co2+), chromium oxide-based films (Co2+, Li+) were investigated. The structural characteristics and morphology were studied for all the obtained nanocomposites and deposits were evaluated as highly crystalline cathode materials cathodes, having high cyclability, in Li batteries.
The improved functionality of the electrodeposited nanomaterials was correlated to structural changes. Hollandite and pyrolusite electrodeposition pathways were proposed, based on symmetry principles of phase transitions.
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•Electrolyte doping for powdered MnO2 and CrxOy thin films have advantages vs conventional electrodeposition;•Hollandite and pyrolusite formation pathways can be derived from symmetry principles of phase transitions;•Semi-amorphous, isostructural series of ramsdellite-heterogenite like products at heavy Co + Li doping was established.•Cyclability of Co-doped CrxOy thin film coatings in Li batteries is demonstrated. |
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ISSN: | 0257-8972 1879-3347 |
DOI: | 10.1016/j.surfcoat.2020.126211 |