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Irreversible Structural Changes of Copper Hexacyanoferrate Used as a Cathode in Zn‐Ion Batteries

The structural changes of copper hexacyanoferrate (CuHCF), a Prussian blue analogue, which occur when used as a cathode in an aqueous Zn‐ion battery, are investigated using electron microscopy techniques. The evolution of Zn(x)Cu(1−x)HCF phases possessing wire and cubic morphologies from initial CuH...

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Detalles Bibliográficos
Autores principales: Lim, Joohyun, Kasiri, Ghoncheh, Sahu, Rajib, Schweinar, Kevin, Hengge, Katharina, Raabe, Dierk, La Mantia, Fabio, Scheu, Christina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7187350/
https://www.ncbi.nlm.nih.gov/pubmed/31782839
http://dx.doi.org/10.1002/chem.201905384
Descripción
Sumario:The structural changes of copper hexacyanoferrate (CuHCF), a Prussian blue analogue, which occur when used as a cathode in an aqueous Zn‐ion battery, are investigated using electron microscopy techniques. The evolution of Zn(x)Cu(1−x)HCF phases possessing wire and cubic morphologies from initial CuHCF nanoparticles are monitored after hundreds of cycles. Irreversible introduction of Zn ions to CuHCF is revealed locally using scanning transmission electron microscopy. A substitution mechanism is proposed to explain the increasing Zn content within the cathode material while simultaneously the Cu content is lowered during Zn‐ion battery cycling. The present study demonstrates that the irreversible introduction of Zn ions is responsible for the decreasing Zn ion capacity of the CuHCF cathode in high electrolyte concentration.