Table 2.

Microwave synthesis parameters of the investigated spinel-type Co₃O₄ samples.

Sample name	Co(OAc)2 [mmol]	H2O2 [mL]	Synthesis temp [°C]	Ramping time [min]	Holding time [min]	Stirring speed
0.18 mmol	0.18	0	180	30	45	Slow
0.6 mmol	0.6	0	180	30	45	Slow
0.9 mmol	0.9	0	180	30	45	Slow
1.2 mmol	1.2	0	180	30	45	Slow
Standard	1.8	0	180	30	45	Slow
1.5 ml H2O2	1.8	1.5	180	30	45	Slow
3 ml H2O2	1.8	3	180	30	45	Slow
160°C	1.8	0	160	30	45	Slow
140°C	1.8	0	140	30	45	Slow
20 min ramping	1.8	0	180	20	45	Slow
10 min ramping	1.8	0	180	10	45	Slow
30 min holding	1.8	0	180	30	30	Slow
Fast stirring	1.8	0	180	30	45	Fast

Color changes indicate the variation of a single parameter (shown in bold).