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

ABSTRACT: 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 (?1.23?V), beyond which the hydrogen and oxygen evolution reactions occur. Here we report the formation of layered Mn5O8 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 Mn5O8 suppresses the gas evolution reactions, offers a two-electron charge transfer via Mn2+/Mn4+ redox couple, and provides facile pathway for Na-ion transport via intra-/inter-layer defects of Mn5O8.

SUBMITTER: Shan X 

PROVIDER: S-EPMC5116065 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

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Bivalence Mn<sub>5</sub>O<sub>8</sub> with hydroxylated interphase for high-voltage aqueous sodium-ion storage.

Shan Xiaoqiang X   Charles Daniel S DS   Lei Yinkai Y   Qiao Ruimin R   Wang Guofeng G   Yang Wanli W   Feygenson Mikhail M   Su Dong D   Teng Xiaowei X  

Nature communications 20161115

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 (∼1.23 V), beyond which the hydrogen and oxygen evolution reactions occur. Here we report the formation of layered Mn<sub>5</sub>O<sub>8</sub> pseudocapacitor electrode material with a well-ordered hydroxylated interphase. A symmetric full cell using such electrodes demon  ...[more]

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