School of Science and Environment of Salford M54WT;
Diamond Light Source Science and Innovation Campus 0X1/ODE;
JEOL UK Ltd.JEOL House-2 Silver Court Garden City AL71LT;
Department of Chemistry College London Gordon Street WC1H OAJ;
UK Catalysis Hub Complex at Harwell(RCaH) Appleton Laboratory Oxon 0X11 OFA;
Johnson Matthey Technology Centre RG49NH.UK;
HAADF-STEM; Single Fe atom sites; N-doped; Few-layer graphene; Dinuclear Fe species;