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. Author manuscript; available in PMC: 2018 Jul 19.
Published in final edited form as: ACS Appl Mater Interfaces. 2017 Jul 3;9(28):23325–23332. doi: 10.1021/acsami.6b15387

Figure 1.

Figure 1

Structure characterizations of MnO2 nanotubes: TEM images of MnO2 nanotubes (a, b), XRD pattern of MnO2 nanotubes (c) and XPS spectrum of MnO2 nanotubes (d).