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Deciphering charge-storage mechanisms in 3D MnOx@carbon electrode nanoarchitectures for rechargeable zinc-ion cells

Published online by Cambridge University Press:  29 January 2019

Jesse S. Ko
Affiliation:
Naval Research Laboratory–National Research Council Postdoctoral Associate, Washington, DC, 20375, USA
Martin D. Donakowski
Affiliation:
Exponent, Inc., 9 Strathmore Road, Natick, Massachusetts, 01760, USA
Megan B. Sassin
Affiliation:
U.S. Naval Research Laboratory, Surface Chemistry Branch (Code 6170), Washington, DC, 20375, USA
Joseph F. Parker
Affiliation:
U.S. Naval Research Laboratory, Surface Chemistry Branch (Code 6170), Washington, DC, 20375, USA
Debra R. Rolison
Affiliation:
U.S. Naval Research Laboratory, Surface Chemistry Branch (Code 6170), Washington, DC, 20375, USA
Jeffrey W. Long*
Affiliation:
U.S. Naval Research Laboratory, Surface Chemistry Branch (Code 6170), Washington, DC, 20375, USA
*
Address all correspondence to Jeffrey W. Long at jeffrey.long@nrl.navy.mil
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Abstract

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 (Zn4(OH)6(SO4xH2O), mediated by the more uniformly reactive electrode structure inherent to the CNF scaffold.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2019 

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