Quantum Rate Theory and Electron-Transfer Dynamics: A Theoretical and Experimental Approach for Quantum Electrochemistry

Abstract

Quantum rate theory is based on a first-principle quantum mechanical rate concept that comprises with the Planck-Einstein relationship $E=h\nu$, where $\nu =e^2/h{C}_q$ is a frequency associated with the quantum capacitance $C_q$ and $E=e^2/C_q$ is the energy associated with $\nu$. For a single state mode of transmittance, $e^2/C_q$ corresponds to the chemical potential differences $\Delta \mu$ between donor and acceptor state levels comprising an electrochemical reaction. The latter assumption implies quantum electrodynamics within a particular quantum transport mode intrinsically coupled to the electron-transfer rate of electrochemical reactions that have not been considered thus far. Here it is demonstrated that the consideration of this inherent quantum transport is key to obtaining an in-depth understanding of the electron transfer phenomenon. Finally, the theory is validated through its description of electron transfer, quantum conductance, and capacitance in different electro-active molecular films.