fig2

Figure 2. XPS spectra: (A) overall spectrum. (B) Zn 2p. (C) V 2p. (D) O 1s. SEM images at different magnifications (E-G) of ZVNW-CC.
Figure 2. XPS spectra: (A) overall spectrum. (B) Zn 2p. (C) V 2p. (D) O 1s. SEM images at different magnifications (E-G) of ZVNW-CC.
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