fig6

Figure 6. Comparison of anatase TiO₂ nanotube array and SrTiO₃ photoanode. (A) SEM images of the top and side views of the oxide layers. (B) Cyclic voltammograms and (C) photocurrent response of anatase TiO₂ and SrTiO₃ photoanodes in aqueous 0.2 M Na₂SO₄ and 0.1 M NaPi solution (pH: 6.7, wavelength: 365 nm, and irradiance: 40 mW cm^-2) at varying applied potential (V vs. RHE). Reproduced from ref.^[13] with permission from the Royal Society of Chemistry.