Figure 2.
XRD patterns of the 3D n-ZnO/p-NiO hierarchical structures with the different molar ratios of Zn and Ni: Zn5Ni1 (a), Zn2Ni1 (b), Zn1Ni1 (c), Zn1Ni2 (d), and Zn1Ni5 (e).
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