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Title: 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 (~1.23 V), beyond which the hydrogen and oxygen evolution reactions occur. Here, we report the formation of layered Mn 5O 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. Furthermore, the interplay between hydroxylated interphase on the surface and the unique bivalence structure of Mn 5O 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 5O 8.
Authors:
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Publication Date:
Report Number(s):
BNL-112679-2016-JA; BNL-113277-2016-JA
Journal ID: ISSN 2041-1723; R&D Project: 16060; 16060; KC0403020
Grant/Contract Number:
SC00112704; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY, AND ECONOMY; Mn5O8; aqueous sodium-ion storage; Center for Functional Nanomaterials; Mn5O8
OSTI Identifier:
1328373
Alternate Identifier(s):
OSTI ID: 1337640; OSTI ID: 1377589