DIY Solar Energy: Photosynthetic Solar Cells (In the Greenhouse #17)
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- Опубликовано: 25 авг 2024
- The Sun delivers more energy to Earth in an hour than people use in a year. Plants have used this solar energy for millions of years, and biomimetic solar cells can help human communities become carbon neutral. In this video we learn how solar cells work and how to make our own dye-sensitized solar cells using berry juice and a few simple materials. The Cornell Center for Materials Research Lending Library of Experiments provides the necessary equipment: www.ccmr.corne...
LESSON PLANS and other support for this activity are part of the Teach Climate Change project: climate.eartha...
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Music in this video: Island Woke, by Freedom Trail Studio
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Solar power is one of so many solutions for reducing greenhouse gases; and we need to employ all of our options! I love how the DSSCs are both functional and beautiful too :>
Very good explanation. Thank you
Hello! Can we have the research paper of this study? Thank you in advance!
what did you use in the combination with the titania oxide some NaSO or ? and why ? as a binder ?
👍👍👍
Please i need a detailed explanation on the connection. I want to power a led bulb
@movieclipfusion more details on this activity are here: climate.earthathome.org/diy-solar-energy-photosynthetic-solar-cells/
Hello! Can the same procedure be used with Eggplant Peels? Can you further explain the Redox Electrolyte?
Eggplant skin contains anthocyanin, so yes I think it should work! For the electrolyte: The iodide electrolyte delivers electrons from one side of the cell to the other in response to the voltage generated by sunlight hitting the berry juice and the subsequent current produced. Within the electrolyte the current causes the reaction 3I- -> I3- , reducing the I- and delivering the two extra electrons to the electrode side (left in the diagram) of the cell. This reaction creates a concentration gradient: more I- near the counter-electrode (right side) and more I3- near the electrode. The concentration gradient forces the diffusion of the two species back to where they started. As long as the voltage is applied to this system (by sunlight) the oxidation/reduction reactions and physical diffusion will occur in tandem to keep the cell working.
Can it charge a 18650 battery? (If not, can I convert it using voltage booster to charge the battery?)
Li-ion batteries are fussy and should be charged with a dedicated Li-ion charger
did you really turn on the Jointiff with only 4 DSSC dyed with berries? i don't think there's enough current and voltage, the working voltage of the jointiff board is 2.5 to 5 v, and nevertheless the too little current. But i do hope you made it work!
Yes - the Jointiff buzzer really works w 4 DSSC cells! We've run tests to see what the voltage threshold is; the buzzer makes a feeble whine at 0.9V and plays normally at 1.2V. The current is very low, about 0.02mA. This is the lowest-power device I've found for use with the DSSCs :>
@@paleontologicalresearchins9790 thank you for your reply! Wow I thought to make a beep sound requires much more than 0.02mA, maybe I was wrong!
Isn’t that a parallel connection?
The DSSCs used to power the little music box are connected head-to-tail, in series. More info here - climate.earthathome.org/diy-solar-energy-photosynthetic-solar-cells/#background-extensions
Is there any specific fruits that we can use aside from raspberry?
Raspberries, blackberries and blueberries all work well
@@paleontologicalresearchins9790 we followed every single step of the process. But I don’t know why we can’t get enough voltage. 😢
Hiii. I have a question. Is it fine if we use silicon as a semi conductor instead of titanium dioxide?
Any semiconductor should work, and it would be interesting to see the results of different combinations of materials!
@@paleontologicalresearchins9790 Cool. Thanks
01:26
Hii, I have another question. Do you guys know how long one sandwich will last to produce voltage? What if the iodide solution evaporates? Does will affect the performance of each sandwich?
I have never tested the useful lifetime of a cell, but I think the rate limiting factor would be the degradation of the berry juice?
Can i ask where can we buy redox/iodide electrolyte?
The teacher handout from CCMR has a list of suppliers on the last page :> docs.google.com/document/d/1LpJQ79rqzSUBe_WTJNo6eDh1i3vJUJXfYoWYAW46ijM/edit