The best fit was achieved for Cr2O3 by limiting the fitting to the short range of the second shell (<3 Å) and by varying the number of Cr-Cr paths resembling the connection of Cr atoms via O atoms (Figure and). Other short range Cr2O3 configurations that did not fit the spectra well are listed in Figure -S18 and Table. S2-5. Fitting with a third shell was not possible as the Cr2O3/rGO gives no significant signal in fitting ranges higher than the second shell (> 3 Å).