Question

Please answer question 1a

1. The triodide ion ((I₃)-) is used in conjunction with iodide (I-) as a hole transporter in dye-sensitized solar cells. Molecules on TiO₂ nanoparticles, when excited by light, donate electrons to the nanoparticles that transfer to a transparent conducting substrate, leaving a hole (+) on the molecules. Iodides give electrons to neutralize the holes, and then travel to the opposite electrode as ((I₃)-) where they take electrons (completing the circuit) to become I- again.

(a) Write a balanced chemical equation using ((I₃)-), I- and e to show the half reaction at the electrode that turns ((I₃)-) back to I-. Do the same for the reaction at the molecules with holes (+) on them. (4 points).

(b) ((I₃)-) is a very rare example of a molecule for which on cannot draw a Lewis structure (it is a linear molecule). To show this, draw a Lewis dot structure for I₂. Then explain why (I-I-I)- cannot satisfy the octet rule for the central I. (6 points)

Answer 1

Given that, the -) The tried ide ion (C13)-) is used in conjunction with iodide (..) as a hole transporter in dye - Sensitized Solar cells. Molecular on Pio Danoparticles When Encited by light, donate Electrons to the Nanoparticles that transfer to transparent Condweting Substrate leaving a hole (+) on molecule. it gives Electrons to Neutralize of the holes, and then travel for these opposite Electrode as ((13)-).

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Balanced chemical Equation using ((13).), I. and show to the hall Dreaction at the electrode that toons ((13)-) back to the game dreaction of Molecules with holes (t) on them. Joll chemical turn of Molecules Equation (C13)-), 1- Electrode ((Ig).). with holes (+) ::: I-11 molecule of the holes, Scanned with CamScanner