期刊
MRS COMMUNICATIONS
卷 9, 期 1, 页码 99-106出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/mrc.2019.3
关键词
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资金
- U.S. Office of Naval Research
- DOE Office of Science [DE-AC02-06CH11357]
We previously demonstrated that electrode architectures comprising nanoscale birnessite-like MnOx affixed to three-dimensional carbon nanofoam (CNF) scaffolds offer performance advantages when used as cathodes in rechargeable zinc-ion cells. To discern chemical and physical changes at the MnOx@CNF electrode upon deep charge/discharge in aqueous Zn2+-containing electrolytes, we deploy electroanalytical methods and ex situ characterization by microscopy, elemental analysis, x-ray photoelectron spectroscopy, x-ray diffraction, and x-ray pair distribution function analyses. Our findings verify that redox processes at the MnOx are accompanied by reversible precipitation/dissolution of crystalline zinc hydroxide sulfate (Zn-4(OH)(6)(SO4)center dot xH(2)O), mediated by the more uniformly reactive electrode structure inherent to the CNF scaffold.
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