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SEM images of the electrospun ferrocene/PVP fibers with different mass fractions of ferrocene: (a) 0 wt %; (b) 15 wt %, (c) 20 wt %, (d) 25 wt %, (e) 30 wt %, (f) 35 wt %, (g) 40 wt % and (h) 45 wt % (PVP concentration, 10 wt %; voltage, 10 kV; work distance, 15 cm; flow rate, 1 mL/h).
