Hydrothermal Synthesis of rGO/PbTiO₃ Photocatalyst and Its Photocatalytic H₂ Evolution Activity

Figure 6

Nyquist plots measured at 1.23 V (vs. RHE) in 0.5 M Na₂SO₄ solution. Several samples were irradiated with simulated sunlight from the back side of FTO. The frequency is in the range from 0.1 MHz to 0.01 Hz. The inset is the equivalent circuit model: (a) PGO0, (b) PGO015, (c) PGO030, (d) PGO060, and (e) PGO120.