Figure 1
From: Enriched Pyridinic Nitrogen Atoms at Nanoholes of Carbon Nanohorns for Efficient Oxygen Reduction
HRTEM images of (a) SWNHs, (b) N-SWNHs, (c) O-SWNHs, and (d) N-O-SWNHs and their corresponding STEM-EDX maps (e–p). In the STEM-EDX maps, red, green, and blue correspond to C (e–h), O (i–l), and N (m–p), respectively, and the scale bar represents 20 nm.
