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Table 1 Surface nitrogen density and relative ratio of each nitrogen component

From: Lewis Basicity of Nitrogen-Doped Graphite Observed by CO2 Chemisorption

Type of nitrogen Pyridinic N Cyanide N Center N Valley N
Nitrogen density/ML 0.0024 0.0002 0.0054 0.0045
Relative ratio/% 19 2 43 36