ZIB	Zinc-ion battery
MNH-CNT	MnO2 heterostructure on multi-walled carbon nanotubes
MN-CNT	MnO2 on multi-walled carbon nanotubes
MN-CNT6040	MN-CNT having MnO2 and MWCNT ratio of 60:40
MN-CNT7525	MN-CNT having MnO2 and MWCNT ratio of 75:25
MN-CNT9010	MN-CNT having MnO2 and MWCNT ratio of 90:10
MIB	Metal-ion battery
LIB	Lithium-ion battery
SHE	Standard hydrogen potential
CNT	Carbon nanotube
SWCNT	Single-walled carbon nanotube
MWCNT	Multi-walled carbon nanotube
XRD	X-ray diffraction
FESEM	Field emission scanning electron microscope
TEM-EDS	Transmission electron microscope with energy dispersive spectroscopy
CV	Cyclic voltammetry
CE	Coulombic efficiency
OLC	Onion-like carbon
DI water	Deionized water