Multicomposite Nanostructured Hematite-Titania Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen Evolution Catalyst.

ABSTRACT: We present a sol-gel processed hematite-titania-based photoanode, which exhibits a photocurrent of up to 2.5 mA/cm² at 1.23 V_RHE under simulated AM 1.5 G illumination (100 mW/cm²) thanks to the addition of an amorphous cocatalyst with the nominal composition Fe₂₀Cr₄₀Ni₄₀O _x . To unveil the role of the cocatalyst interconnected to the photoanode, we performed impedance measurements. According to the one order of magnitude higher value for the capacitance associated with surface states (C _SS) compared to the bare photoanode, the function of the catalyst-photoanode interface resembles that of a p-n-like junction. In addition, the charge transfer resistance associated with charge transfer proc

SUBMITTER: Bartsch M 

PROVIDER: S-EPMC6641740 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature