Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms13370
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Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0010286]
- National Science Foundation [ACI-1053575]
- DOE Office of Science [DE-AC02-06CH11357]
- U.S. Department of Energy [DE-AC02-05CH11231]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC05-00OR22725]
- Oak Ridge National Laboratory
- U.S. DOE Office of Science Facility [DE-SC0012704]
- U.S. Department of Energy (DOE) [DE-SC0010286] Funding Source: U.S. Department of Energy (DOE)
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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 (similar to 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 3.0V 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.
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