Preparation of a Nitrogen-Doped Reduced Graphene Oxide-Modified Graphite Felt Electrode for VO²⁺/VO₂⁺ Reaction by Freeze-Drying and Pyrolysis Method

Table 3

N special content of N-rGO measured by XPS.

Sample	N species content
	Pyridinic-N (%)	Pyrrolic-N (%)	Graphitic-N (%)
N-rGO-500/GF	62.36	26.66	10.98
N-rGO-700/GF	67.38	19.07	13.55
N-rGO-900/GF	67.66	16.37	15.97