Electron Transfer to CO2 during Adsorption at the Metal | Solution Interface

<i>We estimate the rate of electron transfer to CO<sub>2</sub> at the Au(211)|water interface during adsorption in an electrochemical environment under negative potentials. Based on density functional theory calculations at the generalized gradient approximation, hybrid, and GW levels of theory, we find electron transfer to adsorbed *CO<sub>2</sub> to be very facile. This high rate of transfer is estimated by the energy distribution of the adsorbate-induced density of states as well as from the interaction between diabatic states representing neutral and negatively charged CO<sub>2</sub>. Up to 0.54 electrons is transferred to CO<sub>2</sub>, and this charge adiabatically increases with the bending angle to a lower limit of 140°. We conclude that this rate of electron transfer is extremely fast compared to the timescale of the nuclear degrees of freedom, that is, the adsorption process</i><br>