The interconversion of chemical, electrical, and optical energies at solid-liquid interfaces is critical to many existing and emerging energy technologies. Semiconductor nanostructures often play critical roles in these technologies. This talk will present recent results from experiments aimed at elucidating the redox properties of colloidal semiconductor nanocrystals containing extra delocalized conduction-band electrons, i.e., reduced semiconductor nanocrystals, or degenerately n-doped nanocrystals. This talk will describe photochemical methods for introducing stable excess conduction-band electrons into various colloidal semiconductor nanocrystalss, as well as the use of spectroelectrochemical potentiometry for in situ measurement of Fermi levels during nanocrystal reduction or oxidation reactions. By these methods, the effects of electron-electron, electron-proton, and electron-surface-dipole electrostatic interactions can be quantified. Nanocrystal capacitance, the effects of selective electron, proton, or proton-coupled electron reactions, and other key fundamental aspects of the electronic structures of multiply reduced colloidal semiconductor nanocrystals will be discussed.

Electrochemical measurements of the redox potentials of multiply reduced colloidal semiconductor nanocrystals

255th National Meeting (2018)

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