The EXAFS fitting was performed by the Artemis software to obtain the coordination numbers and the bond lengths using ab initio-calculated phases and amplitudes. In order to reduce the number of variables, the energy shift (dE) was set as the same value for each path in a fit by the assumption of the same energy shift in a spectrum. Besides, the Debye-Waller factors (DW) of first coordination shell (Pt-N and Pt-O) for the pN-C samples were assumed to be the same variable for a fit due to the similar degree of disorder in the same coordination shell .