fig2

Figure 2. The surface electronic structure and contact angles of the synthesized samples. (A) XPS survey spectra. The XPS spectra of (B) Ni 2p, (C)Fe 2p, (D) Pt 4f and (E) O 1s. (F) EPR spectra. (G-H) TDOS of NiFe LDH without O_v, NiFe LDH with O_v, Pt_QDs@NiFe LDH without O_v and Pt_QDs@NiFe LDH with O_v. (K-M) The contact angles. (N, O) The bubble contact angles.