Content of different types of nitrogen in Co, N-CNT-T (120 °C, 140 °C, and 160 °C).

Sample	N [at%]	Pyridinic-N [at%]	Pyrrolic-N [at%]	Graphitic-N [at%]	Oxidized-N [at%]
Co, N-CNT-120	3.14	1.06	0.80	0.90	0.34
Co, N-CNT-140	4.58	1.81	1.17	1.17	0.42
Co, N-CNT-160	9.81	5.00	2.70	1.60	0.53