Figure 2
From: Enriched Pyridinic Nitrogen Atoms at Nanoholes of Carbon Nanohorns for Efficient Oxygen Reduction
(a) Raman spectra obtained using a 514 nm laser line and (b) N2 adsorption isotherms at 77 K for the pristine and N-doped SWNHs (closed symbol: adsorption, open symbol: desorption).
