Fig. 4 Electrochemical mechanism studies.

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Fig. 4 Electrochemical mechanism studies. Electrochemical mechanism studies. (A) Ex situ XRD patterns of the ZVO electrode at different charge/discharge states as indicated in (B). (B) Corresponding charge/discharge curves at 0.2 A g−1 in 3 M Zn(CF3SO3)2 aqueous electrolyte. Ex situ high-resolution XPS spectra of the (C) Zn 2p region of pristine VOOH, fully discharged and charged ZVO electrodes. (D to F) V 2p region of pristine, fully discharged and charged ZVO electrodes. Lulu Wang et al. Sci Adv 2019;5:eaax4279 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).