Fig. 3

XANES and WT-EXAFS spectra. a Ni and b V K-edge XANES spectra. c Ni and d V K-edge extended XANES oscillation functions k³χ (k). WT-EXAFS of e Ni and f V of the as-prepared NiV-LDH, NiVRu-LDH, and NiVIr-LDH (from left to right). g C K-edge XANES spectra. h V L-edge and O K-edge XANES spectra