Engineering Fe-N 4 Electronic Structure with Adjacent Co-N 2 C 2 and Co Nanoclusters on Carbon Nanotubes for Efficient Oxygen Electrocatalysis

Highlights Engineering Fe-N 4 electronic structure with adjacent Co-N 2 C 2 and Co sub-nanoclusters to optimize the electronic structure of the Fe-N 4 active center is first demonstrated. Electrochemical studies reveal that the amorphous carbon corrosion leads to significantly increased charge- and mass-transport resistances. The operando X-ray absorption spectroscopy allows an investigation of the effect of highly oxidative environments on electrochemical behavior.