Sample

C content (at%)

O content (at%)

N content (at%)

Graphitic N %

Pyridinic N %

Pyrrolic N %

Ratio (Pyridinic/Gra + Pyrrolic)

PCNF

89.86

7.79

2.35

26.09

19.54

54.36

0.24

N-PCNF

(PI-30%)

87.24

8.46

3.77

24.15

43.89

31.96

0.78

N-PCNF

(PI-50%)

88.8

8.5

2.5

32.64

40.02

32.64

0.61

N-PCNF

(PI-100%)

87.8

9.8

2.4

48.07

29.33

22.65

0.41