Figure 2.

(A) Scheme of the photoelectrochemical cell used in the present study for water splitting. CdSe nanoparticles (red) are bound to the TiO₂ nanoparticles through chiral molecules. The TiO₂ nanoparticles are attached to the FTO conducting electrode. On the Pt electrode, the H⁺ ions are reduced to form H₂. (B) Scheme of the electron transfer between the S^2– and the TiO₂ nanoparticles. Upon excitation of the CdSe nanoparticles, the excited electrons are transferred through the chiral molecules to TiO₂ (from there to the external circuit). This is a spin-specific electron transfer because the transfer through the chiral molecule is preferred for one spin over the other. Thus, the hole in the CdSe has a well-defined spin alignment; therefore, electrons with this spin will be transferred from the anions in the solution to CdSe.