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 Mn0x@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(0H)6(S04)·xH20), mediated by the more uniformly reactive electrode structure inherent to the CNF scaffold.
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Acknowledgments
This work was supported by the U.S. Office of Naval Research. J.S.K. is an NRL-NRC Postdoctoral Associate (2016-2018). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The authors would like to thank Dr. Olaf Borkiewicz of Argonne National Laboratory for data acquisition, integration, and assistance.
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Ko, J.S., Donakowski, M.D., Sassin, M.B. et al. Deciphering charge-storage mechanisms in 3D MnOx@carbon electrode nanoarchitectures for rechargeable zinc-ion cells. MRS Communications 9, 99–106 (2019). https://doi.org/10.1557/mrc.2019.3
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DOI: https://doi.org/10.1557/mrc.2019.3