Abstract: In this talk I will introduce some issues connected with the simulation of electrified interfaces at the nanoscale focusing in particular on modelling the effect of an applied potential to an electrochemical cell. I will present some recent progress in the simulation of the double layer of the fundamental Pt-water interface and its response to changes of potential applied to the cell. If time allows, I will illustrate how combining the non-equilibrium Green functions formalism and DFT based methodologies to simulate atomic dynamics can lead to a more sophisticated description of EC phenomena.