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WANG Yu-Zheng^1,^2,^3,⁴, XUE Xiang-Xin^1,^2,^3,⁴, YANG He^1,^2,^3,⁴

Fig. 3 XPS spectra for ZnCe-TiO 2 materials a ZnCe-TiO 2 -600; b Ce3d regions