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. 2018 Oct 11;9:4208. doi: 10.1038/s41467-018-06687-z

Fig. 2.

Fig. 2

Characterization of FeOOH/BiVO4 photoanode. a SEM image of FeOOH/BiVO4 (top view, scale bar: 500 nm). b Transparency of FeOOH/BiVO4 measured by a UV-Vis spectrometer and a Tauc plot (inset) of BiVO4 indicating 2.6 eV of bandgap. c XPS local scan spectra of Fe 2p, O 1s regions before (black) and after (red) the deposition of FeOOH on BiVO4. d PEC IV characteristics of the BiVO4 photoanode with (blue) and without (red) a FeOOH catalyst. The active area of the photoanode was 1 cm2