Fig. 1: Characterisation of Pt_SCuO/Al₂O₃ and Pt_NCuO/Al₂O₃.

a, b TEM images of Pt_SCuO/Al₂O₃ (the inset in a shows the particle size distribution. The average particle size was calculated based on more than 100 particles.); Pt L₃-edge and Cu K-edge EXAFS of Pt_SCuO/Al₂O₃ (c) and Pt_NCuO/Al₂O₃ (d).