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. 2019 May 14;7:335. doi: 10.3389/fchem.2019.00335

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Copyright © 2019 Zhang, Zhang and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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SEM images of (a) pristine NaNi_0.7Mn_0.15Co_0.15O₂, (b) NaNi_0.7Mn_0.15Co_0.15O₂ after 24 h air-exposure, (c) NaNi_0.7Mn_0.15Co_0.15O₂ after 7 days air-exposure, (d) dendrite-like impurity in part b with the corresponding elemental mappings of Na, C and Ni, (e) TOF-SIMS chemical mapping of NaNi_0.7Mn_0.15Co_0.15O₂ after 24 h exposure, (f) XRD patterns of NaNi_0.7Mn_0.15Co_0.15O₂ samples under different air exposed time, (g) the enlarged peaks from part f, (h) TGA profiles of pristine NaNi_0.7Mn_0.15Co_0.15O₂ and 7 days exposed NaNi_0.7Mn_0.15Co_0.15O₂ samples. Reproduced with permission (You et al., 2018). Copyright 2018, American Chemical Society.