Effects of cobalt precursor on pyrolyzed carbon-supported cobalt-polypyrrole as electrocatalyst toward oxygen reduction reaction

Table 2 D -band and G -band intensities of carbon in Co-PPy-TsOH/C catalysts prepared from various cobalt precursors and calculated graphitization degree

Cobalt precursor	D-band intensity (I_D/a.u.)	G-band intensity (I_G/a.u.)	Graphitization degree (I_G/I_D)
Cobalt acetate	2,122	1,768	0.833
Cobalt nitrate	2,678	2,377	0.887
Cobalt oxalate	1,633	1,493	0.914
Cobalt chloride	2,158	1,942	0.900