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Ammonium‐Ion Storage Using Electrodeposited Manganese Oxides
Author(s) -
Song Yu,
Pan Qing,
Lv Huizhen,
Yang Duo,
Qin Zengming,
Zhang MingYue,
Sun Xiaoqi,
Liu XiaoXia
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202013110
Subject(s) - electrolyte , hydrogen storage , manganese , inorganic chemistry , electrochemistry , chemistry , ion , ammonium , aqueous solution , oxide , energy storage , materials science , hydrogen , electrode , organic chemistry , power (physics) , physics , quantum mechanics
NH 4 + ions as charge carriers show potential for aqueous rechargeable batteries. Studied here for the first time is the NH 4 + ‐storage chemistry using electrodeposited manganese oxide (MnO x ). MnO x experiences morphology and phase transformations during charge/discharge in dilute ammonium acetate (NH 4 Ac) electrolyte. The NH 4 Ac concentration plays an important role in NH 4 + storage for MnO x . The transformed MnO x 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 NH 4 Ac, outperforming the state‐of‐the‐art NH 4 + hosting materials. Experimental results suggest a solid‐solution behavior associated with NH 4 + migration in layered MnO x . Spectroscopy studies and theoretical calculations show that the reversible NH 4 + insertion/deinsertion is accompanied by hydrogen‐bond formation/breaking between NH 4 + and the MnO x layers. These findings provide a new prototype (i.e., layered MnO x ) for NH 4 + ‐based energy storage and contributes to the fundamental understanding of the NH 4 + ‐storage mechanism for metal oxides.