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Agenda

Agenda. Do Now Dye-Sensitized Solar Cells Extension DSSC dye discussion. Lesson Objectives. SWBAT compare the effectiveness of different fruit juices as dyes for DSSCs. Do Now.

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Agenda

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  1. Agenda • Do Now • Dye-Sensitized Solar Cells Extension • DSSC dye discussion Lesson Objectives • SWBAT compare the effectiveness of different fruit juices as dyes for DSSCs. Do Now • What do you think you will observe if the dye from a different fruit does not work as well as the blackberry juice? • What is an advantage of dye-sensitized solar cells over standard solar cells?

  2. Pick either blueberries and strawberries and remake the DSSC

  3. Anthocyanin structure Conjugated double bond system

  4. Anthocyanins are pigments that produce many of the colors we see • Cherries • Eggplants • Red cabbage (has over 30 types of anthocyanins!)

  5. Pigments in blackberries

  6. What if you just used one of the pigments in blackberries as the dye for a DSSC?

  7. Hydrangeas • Contains anthocyanins • Color dependent on the soil pH • Acidic soil – blue flowers • Basic soil – pink/red • Slightly acidic/neutral – purple or a mix of blue and pink • Depends on species of hydrangea

  8. Post Lab Questions • 1.  What differences did you observe between the blackberry cell you made yesterday and today's cell? • 2.  Why are blackberries an effective source of dye?  What are the essential chemical features of an effective dye? • 3.  Do you think apples or raspberries would be more likely to work as a source of dye for solar cells?

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