An E 0 values of 7709.0 eV was used to calibrate all data with respect to the first inflection point of the absorption K-edge of Co foil, respectively. The backscattering amplitude and phase shift functions for specific atom pairs were calculated ab initio using the FEFF8 code. X-ray absorption data were analyzed using standard procedures, including pre-edge and postedge background subtraction, normalization with respect to edge height, Fourier transformation, and nonlinear least-squares curve fitting. The normalized k 3 -weighted Extended X-ray Absorption Fine Structure (EXAFS) spectra, k 3 x(k), were Fourier-transformed in a k range from 1.5 to 11 Å - 1 , to evaluate the contribution of each bond pair to the Fourier transform (FT) peak. The experimental Fourier-filtered spectra were obtained by performing an inverse Fourier transformation with a Hanning window function with r between 0.8-2 for first coordinated shell and 1.8-3.1 Å for second coordinated shell. The S0 2 (amplitude reduction factor) values of the Co was fixed at 0.88, to determine the structural parameters of each bond pair.