Figure 1

(a) Schematic illustration of the synthesis of Ni-Mn-OH@Ni₃S₂/NF by rapid immersing Ni₃S₂/NF in a 100 °C pre-heated aqueous solution with MnCl₂ for 5 s. SEM images of (b,c) Ni₃S₂/NF and Ni-Mn-OH@Ni₃S₂/NF, respectively. (d,e) HRTEM images of Ni-Mn-OH@Ni₃S₂/NF.