Figure 3

SEM images of Ni-Mn-OH@Ni3S2/NF with different concentration of manganese (a) NiMn0.249OH@Ni3S2/NF, (b) NiMn0.279OH@Ni3S2/NF, (c) NiMn0.968OH@Ni3S2/NF and (d) Ni2.73MnOH@Ni3S2/NF.

SEM images of Ni-Mn-OH@Ni3S2/NF with different concentration of manganese (a) NiMn0.249OH@Ni3S2/NF, (b) NiMn0.279OH@Ni3S2/NF, (c) NiMn0.968OH@Ni3S2/NF and (d) Ni2.73MnOH@Ni3S2/NF.