Investigating the role of interstitial water molecules in copper hexacyanoferrate for sodium-ion battery cathodes

文献情報

出版日 2023-05-29

DOI 10.1039/D3TA02417B

インパクトファクター 12.732

著者

Donghyeon Kim, Ahreum Choi, Changhyun Park, Min-Ho Kim, Hyun-Wook Lee

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要旨

Prussian blue analogues (PBAs) are one of the most promising cathode materials for sodium (Na)-ion batteries owing to their large channel size and stability in aqueous and organic electrolytes. However, the impact of interstitial water molecules within PBA channels has not yet been adequately investigated. Herein, by comparing the electrochemical performance of PBAs in aqueous and organic electrolytes, we demonstrate that water molecules depending on their number can inhibit the insertion of hydrated Na+ ions. As a result, CuHCFe-1.4H2O with fewer interstitial water molecules possesses a higher specific capacity in an aqueous electrolyte compared to CuHCFe-1.8H2O, which has a higher number of interstitial water molecules. In addition, we found that interstitial water molecules can obstruct Na+ ion diffusion, leading to poor kinetic properties. We believe that the newly found roles of interstitial water molecules could shed light on the design of high-performance PBAs for Na+-ion battery cathodes.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Investigating the role of interstitial water molecules in copper hexacyanoferrate for sodium-ion battery cathodes

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