Fig. 2From: Heavily Graphitic-Nitrogen Self-doped High-porosity Carbon for the Electrocatalysis of Oxygen Reduction Reaction a XPS survey of KB900, KB-Z-900 and KB350Z-900; b C1s XPS spectrum of KB350Z-900; c N1 s XPS spectra of KB900, KB-Z-900 and KB350Z-900Back to article page