Elemental composition of prepared NPs obtained by EDS analysis.

Nanoparticles	Atomic percent (%)
	Mn	Ni	O	C
Pure Mn3O4	37.31 ± 0.79	Not detected	39.40 ± 2.22	23.29 ± 2.54
1% Ni doped Mn3O4	41.06 ± 0.58	0.88 ± 0.04	44.12 ± 0.57	13.94 ± 0.04
3% Ni doped Mn3O4	40.79 ± 0.26	2.41 ± 0.38	42.91 ± 0.19	13.89 ± 0.60
5% Ni doped Mn3O4	40.78 ± 0.10	4.43 ± 0.28	44.42 ± 0.07	10.37 ± 0.25
7% Ni doped Mn3O4	37.65 ± 1.05	6.63 ± 0.11	40.55 ± 0.35	15.17 ± 0.63
10% Ni doped Mn3O4	35.86 ± 1.16	8.97 ± 0.45	41.53 ± 0.18	13.63 ± 1.44