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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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
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aqueous sodium-ion storage
Center for Functional Nanomaterials
ENERGY PLANNING, POLICY, AND ECONOMY
ENERGY STORAGE
Mn5O8
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container_title Nature communications
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creator Shan, Xiaoqiang
Charles, Daniel S.
Lei, Yinkai
Qiao, Ruimin
Wang, Guofeng
Yang, Wanli
Feygenson, Mikhail
Su, Dong
Teng, Xiaowei
description 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.
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subjects aqueous sodium-ion storage
Center for Functional Nanomaterials
ENERGY PLANNING, POLICY, AND ECONOMY
ENERGY STORAGE
Mn5O8
title Bivalence Mn5O8 with hydroxylated interphase for high-voltage aqueous sodium-ion storage
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