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From

Photosensitizers for Photogalvanic Cells in the Chemistry Classroom

Claudia Bohrmann-Linde, Diana Zeller

World Journal of Chemical Education. 2018, 6(1), 36-42 doi:10.12691/wjce-6-1-7
  • Figure 1. Different unsensitized photogalvanic cells using a titania-coated photoelectrode; from left to right: 2-pot-cell, 1-pot-cell, compact cell, transparent cell
  • Figure 2. Processes in and at a sensitized photoelectrode
  • Figure 3. Anthocyanin-sensitized photoelectrodes a) before and b) after 15 minutes of irradiation with white light from a flashlight (X-Tactical 103) and c) anthocyanin molecule that is bound to a titania particle via the two vicinal OH-groups of the phenyl substituent
  • Figure 4. Crocin-sensitized photoelectrodes a) before and b) after 15 minutes of irradiation with white light from a flashlight (X-Tactical); c) structure of crocin; the dye is mainly responsible for the yellow color of saffron from the saffron crocus d)
  • Figure 5. Surface of a titania photoelectrode that was scratched down to the conductive glass (blue areas). Measurements of the profile give first information about the thickness of the titania layer and surface roughness. (Keyence VHD-1000X)
  • Figure 6. Absorption spectra of raspberry juice, saffron solution and crocin solution
  • Figure 7. Light microscope images (1,000x) of titania surfaces, sensitized with a) raspberry juice, b) saffron solution, and c) with crocin solution (Keyence VHD-1000X)
  • Figure 8. Bleaching of sensitizing dyes on titania (from top to bottom: crocin, saffron, anthocyanins)
  • Figure 9. a) Photovoltages obtained in a 1-pot-cell with an untreated photoelectrode. Irradiation with UV light, white light, blue light and red light. b) Set-up of the experiment
  • Figure 10. a) Photovoltages of crocin sensitized photoelectrodes in a 1-pot-cell, irradiated with different colors of light and b) emission spectra of the colored flashlight LEDs (X-Tactical)