Research / 2020 / Article / Fig 4

Research Article

Ultrathin Hematite Photoanode with Gradient Ti Doping

Figure 4

(a) Photocurrent density vs. bias voltage (V vs. RHE) curves and (b) wavelength dependence of IPCE measurements at 1.23 V vs. RHE for hematite photoanodes with homogeneously doped, gradient 1.5-6.0%-doped, and gradient 6.0-1.5%-doped Ti element. The plots were measured in the 1.0 M NaOH aqueous solution under AM 1.5G simulated sunlight. The light was illuminated from the backside of the electrodes. (c) Electrochemical impedance spectra and (d) Mott-Schottky plots of the above different photoelectrodes.