Extended Data Fig. 3: Extended X-ray absorption fine structure (EXAFS) spectra of Rb-PHI, Ir0.5-PHI and Ir0.5Rb-PHI.

a, Fourier transform extended X-ray absorption fine structure (FT-EXAFS) spectra of Rb-OH, Rb-PHI, Ir0.5Rb-PHI and RbCl. b, k3-weighted k-space spectrum of Rb for Ir0.5Rb-PHI. c, Fourier transform extended X-ray absorption fine structure (FT-EXAFS) spectra of IrO2, Ir0.5-PHI, Ir0.5Rb-PHI and Ir foil. d, k3-weighted k-space spectrum of Ir for Ir0.5Rb-PHI.