(560ba) H+ Conductivity and O2 Impermeability of Ultrathin Oxide Layers with Built-in SiO2 Separation Membrane for Scalable Artificial Photosynthesis
AIChE Annual Meeting
Wednesday, November 13, 2019 - 3:30pm to 5:00pm
To incorporate the key feature into artificial photosystems, we assembled ultrathin (2 nm), pinhole-free, molecular wires-embedded SiO2 membrane on planar and nanotube constructs. This membrane system spatially separates the H2O oxidation CO2 reduction, but enables (photo-)electrochemical communication between the incompatible redox reactions by transmitting protons and electrons in a precisely controlled manner, while preventing O2 diffusion causing unwanted reverse reactions. This unique mass-transfer behavior on planar and nanotube configurations was systematically studied via cyclic voltammetry, electrochemical impedance spectroscopy, and visible light-sensitized short circuit current experiments. The embedded molecular wiresâ integrity before and after the mass (proton) transfer process was confirmed by time-resolved optical spectroscopy and grazing angle ATR-FT-IR or IRRAS characterization.