Electrospun Core-Shell Hollow Structure Cocatalysts for Enhanced Photocatalytic Activity

Figure 5

Morphology of nanofibers after catalytic degradation. (a, b) Surface appearance of TiO₂ (a) and NaYF₄/Yb/Tm/TiO₂ (b) core-shell hollow fiber proving almost intact morphology. (c, d) Random cross-sectional images of TiO₂ (c) and NaYF₄/Yb/Tm/TiO₂ (d) core-shell hollow fiber proving the apparent existence of NaYF₄/Yb/Tm nanoparticles after catalytic degradation.

(a)

(b)

(c)

(d)