Ma, Yanjiao ; Ma, Yuan ; Dreyer, Sören Lukas ; Wang, Qingsong ; Wang, Kai ; Goonetilleke, Damian ; Omar, Ahmad ; Mikhailova, Daria ; Hahn, Horst ; Breitung, Ben ; Brezesinski, Torsten (2021)
High‐entropy metal–organic frameworks for highly reversible sodium storage.
In: Advanced Materials, 33 (34)
doi: 10.1002/adma.202101342
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
Prussian blue analogues (PBAs) are reported to be efficient sodium storage materials because of the unique advantages of their metal–organic framework structure. However, the issues of low specific capacity and poor reversibility, caused by phase transitions during charge/discharge cycling, have thus far limited the applicability of these materials. Herein, a new approach is presented to substantially improve the electrochemical properties of PBAs by introducing high entropy into the crystal structure. To achieve this, five different metal species are introduced, sharing the same nitrogen‐coordinated site, thereby increasing the configurational entropy of the system beyond 1.5R. By careful selection of the elements, high‐entropy PBA (HE‐PBA) presents a quasi‐zero‐strain reaction mechanism, resulting in increased cycling stability and rate capability. The key to such improvement lies in the high entropy and associated effects as well as the presence of several active redox centers. The gassing behavior of PBAs is also reported. Evolution of dimeric cyanogen due to oxidation of the cyanide ligands is detected, which can be attributed to the structural degradation of HE‐PBA during battery operation. By optimizing the electrochemical window, a Coulombic efficiency of nearly 100% is retained after cycling for more than 3000 cycles.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Ma, Yanjiao ; Ma, Yuan ; Dreyer, Sören Lukas ; Wang, Qingsong ; Wang, Kai ; Goonetilleke, Damian ; Omar, Ahmad ; Mikhailova, Daria ; Hahn, Horst ; Breitung, Ben ; Brezesinski, Torsten |
| Art des Eintrags: | Bibliographie |
| Titel: | High‐entropy metal–organic frameworks for highly reversible sodium storage |
| Sprache: | Englisch |
| Publikationsjahr: | 2021 |
| Ort: | Weinheim |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Advanced Materials |
| Jahrgang/Volume einer Zeitschrift: | 33 |
| (Heft-)Nummer: | 34 |
| Kollation: | 10 Seiten |
| DOI: | 10.1002/adma.202101342 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Prussian blue analogues (PBAs) are reported to be efficient sodium storage materials because of the unique advantages of their metal–organic framework structure. However, the issues of low specific capacity and poor reversibility, caused by phase transitions during charge/discharge cycling, have thus far limited the applicability of these materials. Herein, a new approach is presented to substantially improve the electrochemical properties of PBAs by introducing high entropy into the crystal structure. To achieve this, five different metal species are introduced, sharing the same nitrogen‐coordinated site, thereby increasing the configurational entropy of the system beyond 1.5R. By careful selection of the elements, high‐entropy PBA (HE‐PBA) presents a quasi‐zero‐strain reaction mechanism, resulting in increased cycling stability and rate capability. The key to such improvement lies in the high entropy and associated effects as well as the presence of several active redox centers. The gassing behavior of PBAs is also reported. Evolution of dimeric cyanogen due to oxidation of the cyanide ligands is detected, which can be attributed to the structural degradation of HE‐PBA during battery operation. By optimizing the electrochemical window, a Coulombic efficiency of nearly 100% is retained after cycling for more than 3000 cycles. |
| Freie Schlagworte: | gassing behavior, high‐entropy materials, Prussian blue analogues, secondary batteries, sodium‐ion cathodes |
| ID-Nummer: | 2101342 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien |
| Hinterlegungsdatum: | 23 Jan 2024 08:57 |
| Letzte Änderung: | 23 Jan 2024 08:57 |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
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High‐Entropy Metal–Organic Frameworks for Highly Reversible Sodium Storage. (deposited 22 Jan 2024 13:36)
- High‐entropy metal–organic frameworks for highly reversible sodium storage. (deposited 23 Jan 2024 08:57) [Gegenwärtig angezeigt]
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