Preventing retro-Knoevenagel Condensation of Photosensitizer to Enhance Water Stability in Dye-Sensitized Photoanode
발표자
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초록
내용
For emerging environmental issues, photoelectrochemical cell to generate hydrogen with solar assistance is important. Cyanoacrylic acid has been used as an acceptor and anchor to metal oxide commonly due to great electron withdrawing ability and electron injection efficiency that can drive PEC effectively. However, by 1,4-Michael addition with H2O and direct protonation of carboxylic acid, stability of sensitizer remarkably decreases. It means that the system cannot work well. Accordingly, water stable acceptor with blocking groups were synthesized so, they can physically interrupt the interactions and raise the hydrophobicity of surroundings to prevent degradation of sensitizers from metal oxide. To check the phenomenon, we confirmed it by UV absorption, Mass spectrometry, and DFT calculations. Based on the studies, this newly designed acceptor can be applied to dye sensitized catalysis, dye sensitized photo-electrochemical cell and dye sensitized solar cells with long term stability.