Fig. 4.

(a) Photograph of electrospinning. Representative TEM images of (b) PG fiber and (c) PG-CeO₂ fiber. Representative SEM images with histograms of fiber diameters of PG membranes (d) and PG-CeO₂ fibrous membranes (e). EDS elemental mapping for the merged image of all elements (f), spectrum (g) and elements C in yellow, O in green, Ce in purple (h). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)