fig2

Figure 2. (A) EPR spectra of LaQS, LaO_V-r, Pt₂/LaQS and Pt₂/LaO_V-r; (B-E) XPS spectra of O 1s, N 1s, S 2p and La 3d of LaQS, LaO_V-r, Pt₂/LaQS and Pt₂/LaO_V-r; (F) IR spectra of LaQS, LaO_V-r, Pt₂/LaQS and Pt₂/LaO_V-r. EPR: Electron paramagnetic resonance; XPS: X-ray photoelectron spectroscopy; IR: infrared spectroscopy.