Table 2 Element composition and the detailed content of the four curve-fitted peaks of N1s by XPS.

From: Eucalyptus derived heteroatom-doped hierarchical porous carbons as electrode materials in supercapacitors

Sample

Element content

The specific content of N1s (%)

C (%)

N (%)

O (%)

N-6 + N-5

N-Q + N-X

EC

94.1

2.5

3.4

2.5

–

NHPC-1

89.4

6.2

4.4

6.2

–

NHPC-3

88.7

6.0

5.3

4.1

1.0

NHPC-5

84.7

5.9

9.4

4.4

1.5

NHPC-7

81.5

5.2

13.3

3.9

1.3

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