Fig. 1From: ZnFe2O4 Nanotapers: Slag Assistant-Growth and Enhanced Photoelectrochemical Efficiency(a–c) SEM images of the bare ZnO NRs (a), ZnO NRs covered with the Fe2+/REO porous compound (b), and REO/ZFO nanotapers (c); (d) enlarged view taken from Fig. 1c. The scale bars are 1 μm in Fig. 1a–c and 100 nm in Fig. 1d. The sketches of these three structures are shown at the lower right corner Back to article page