Fig. 2

(a) HRTEM images of Fe-N-aSpEC. (b) HRTEM image of zoomed in CNT on Fe-N-aSpEC, highlighting the interlayer spacing and the planes. (c) HRTEM image of zoomed in CNT on Fe-N-aSpEC and its corresponding elemental mapping of C, Fe and N.

(a) HRTEM images of Fe-N-aSpEC. (b) HRTEM image of zoomed in CNT on Fe-N-aSpEC, highlighting the interlayer spacing and the planes. (c) HRTEM image of zoomed in CNT on Fe-N-aSpEC and its corresponding elemental mapping of C, Fe and N.