Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 27: Poster Session I

MM 27.7: Poster

Tuesday, March 13, 2018, 18:30–19:45, Poster E

Transparent CdS@TiO2 Nanotextile Photoanode with Boosted Photoelectrocatalytic Efficiency and Stability — •Long Liu, Huaping Zhao, Rui Xu, Shipu Xu, Chenglin Zhang, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

Photoelectrocatalytic (PEC) splitting of water into hydrogen and oxygen by direct use of sunlight is an ideal and renewable method for the hydrogen production, which could integrate the solar energy collection and water electrolysis into a single photoelectrode. In this context, we report the exploration of transparent CdS@TiO2 nanotextile photoanode with boosted photoelectrocatalytic (PEC) efficiency and stability, by controllable coating of amorphous TiO2 ultrathin layer via atomic layer deposition (ALD) technique. with precise controlled thicknesses and compositions at an angstrom scale. It is found that the coated pinhole-free TiO2 layers with fixed thicknesses at 0.5-10 nm are effective to stabilize the CdS textile electrode with improved PEC efficiencies, which could not only reliably suppress the active photocorrosion, but also create a tunneling barrier for photogenerated holes, suggesting their promising application for efficient evolution of H2. It is verified that the introduced TiO2 nanoshells could limit the charge recombination, facilitate the charge separation, reduce the charge transfer resistance, and enhance the wettability of electrode, resulting in their significantly enhanced PEC performance.