期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 22, 页码 4917-4922出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201905384
关键词
copper hexacyanoferrate; degradation; electron energy loss spectroscopy; electron microscopy; energy conversion
资金
- Alexander von Humboldt Foundation
- Federal Ministry of Education and Research (BMBF) [FKZ 03EK3005]
- IMPRS-SurMat graduate school
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 ZnxCu1-xHCF 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.
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