Fig. 2. (A) N 1s XPS spectrum of Co–N/CNs-800, the inset displays the two types of N dopants present in Co–N/CNs-800 based on XPS results. (B) High-resolution spectrum of C 1s. (C) N2 adsorption/desorption isotherm of Co–N/CNs-800 and the corresponding pore size distribution (the inset). (D) Raman spectra of Co–N/CNs.
