Deciphering charge-storage mechanisms in 3D MnOx@carbon electrode nanoarchitectures for rechargeable zinc-ion cells. (29th January 2019)

• Record Type: Journal Article
• Authors: Ko, Jesse S.; Donakowski, Martin D.; Sassin, Megan B.; Parker, Joseph F.; Rolison, Debra R.; Long, Jeffrey W.
• Is Part Of: MRS communications. Volume 9:Number 1(2019)
• Page Start: 99
• Page End: 106
• Publication Date: 2019-01-29
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1557/mrc.2019.3
• Languages: English
• ISSNs: 2159-6859

Abstract

Abstract: Abstract : We previously demonstrated that electrode architectures comprising nanoscale birnessite-like MnO x 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 MnO x @CNF electrode upon deep charge/discharge in aqueous Zn 2+ -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 MnO x are accompanied by reversible precipitation/dissolution of crystalline zinc hydroxide sulfate (Zn4 (OH)6 (SO4 )· x H2 O), mediated by the more uniformly reactive electrode structure inherent to the CNF scaffold.