Ammonium‐Ion Storage Using Electrodeposited Manganese Oxides

NH4+ ions as charge carriers show potential for aqueous rechargeable batteries. Studied here for the first time is the NH4+‐storage chemistry using electrodeposited manganese oxide (MnOx). MnOx experiences morphology and phase transformations during charge/discharge in dilute ammonium acetate (NH4Ac...

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Veröffentlicht in:Angewandte Chemie International Edition Jg. 60; H. 11; S. 5718 - 5722
Hauptverfasser: Song, Yu, Pan, Qing, Lv, Huizhen, Yang, Duo, Qin, Zengming, Zhang, Ming‐Yue, Sun, Xiaoqi, Liu, Xiao‐Xia
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Germany Wiley Subscription Services, Inc 08.03.2021
Ausgabe:International ed. in English
Schlagworte:
Acetic acid
Ammonium
Ammonium acetate
Batteries
Current carriers
Energy storage
hydrogen bonding
Ion storage
Manganese
Manganese oxides
Metal oxides
Morphology
phase transformations
Phase transitions
Rechargeable batteries
Specific capacity
Spectroscopy
Storage batteries
hydrogen bonding
phase transformations
batteries
energy storage
manganese
ISSN:1433-7851, 1521-3773, 1521-3773
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Zusammenfassung:NH4+ ions as charge carriers show potential for aqueous rechargeable batteries. Studied here for the first time is the NH4+‐storage chemistry using electrodeposited manganese oxide (MnOx). MnOx experiences morphology and phase transformations during charge/discharge in dilute ammonium acetate (NH4Ac) electrolyte. The NH4Ac concentration plays an important role in NH4+ storage for MnOx. The transformed MnOx with a layered structure delivers a high specific capacity (176 mAh g−1) at a current density of 0.5 A g−1, and exhibits good cycling stability over 10 000 cycles in 0.5 M NH4Ac, outperforming the state‐of‐the‐art NH4+ hosting materials. Experimental results suggest a solid‐solution behavior associated with NH4+ migration in layered MnOx. Spectroscopy studies and theoretical calculations show that the reversible NH4+ insertion/deinsertion is accompanied by hydrogen‐bond formation/breaking between NH4+ and the MnOx layers. These findings provide a new prototype (i.e., layered MnOx) for NH4+‐based energy storage and contributes to the fundamental understanding of the NH4+‐storage mechanism for metal oxides. NH4+ storage using electrodeposited manganese oxides (MnOx) is studied for the first time. MnOx exhibits structural transformation during charge/discharge in dilute ammonium acetate (NH4Ac) electrolyte. Experimental and theoretical results suggest that the reversible NH4+ insertion/deinsertion in layered MnOx is associated with hydrogen‐bond formation/breaking between NH4+ and the MnOx layers.
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202013110