Bivalence Mn5O8 with hydroxylated interphase for high-voltage aqueous sodium-ion storage

Aqueous electrochemical energy storage devices have attracted significant attention owing to their high safety, low cost and environmental friendliness. However, their applications have been limited by a narrow potential window (1/41.23 V), beyond which the hydrogen and oxygen evolution reactions oc...

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Bibliographic Details
Published in:Nature communications 2016-11, Vol.7 (1)
Main Authors: Shan, Xiaoqiang, Charles, Daniel S., Lei, Yinkai, Qiao, Ruimin, Wang, Guofeng, Yang, Wanli, Feygenson, Mikhail, Su, Dong, Teng, Xiaowei
Format: Article
Language:English
Subjects:
aqueous sodium-ion storage
Center for Functional Nanomaterials
ENERGY PLANNING, POLICY, AND ECONOMY
ENERGY STORAGE
Mn5O8
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Summary:Aqueous electrochemical energy storage devices have attracted significant attention owing to their high safety, low cost and environmental friendliness. However, their applications have been limited by a narrow potential window (1/41.23 V), beyond which the hydrogen and oxygen evolution reactions occur. Here we report the formation of layered Mn 5 O 8 pseudocapacitor electrode material with a well-ordered hydroxylated interphase. A symmetric full cell using such electrodes demonstrates a stable potential window of 3.0 V in an aqueous electrolyte, as well as high energy and power performance, nearly 100% coulombic efficiency and 85% energy efficiency after 25,000 charge-discharge cycles. The interplay between hydroxylated interphase on the surface and the unique bivalence structure of Mn 5 O 8 suppresses the gas evolution reactions, offers a two-electron charge transfer via Mn 2+ /Mn 4+ redox couple, and provides facile pathway for Na-ion transport via intra-/inter-layer defects of Mn 5 O 8.
ISSN:2041-1723
2041-1723