Simulation of Electrochemical Oxidation in Aqueous Environments under Applied Voltage Using Classical Molecular Dynamics.

Reactive molecular dynamics (MD) simulations of metal electrodes under an applied voltage in an explicit water environment were performed and compared to predictions from both other calculations and simulations and experimental measurements and observations. MD simulations using the third-generation charge-optimized many body (COMB3) potentials and the electrode COMB (eCOMB) approach allow for the simulation of an externally applied voltage by modifying the equations of motion during the charge equilibration step (QEq) of the MD simulation. Unlike previous work, which prevented charge transfer between the water and metal electrodes, this work coupled the water and metal together through the QEq, which leads to an accumulation of a negative charge on the water and a positive charge on the metal before any voltage is applied.