We consider a 3x3x3 Au(111)-slab in five different solutions: pure water (36 water molecules), one KOH, LiOH, K, or Li with 35 water molecules, see Figure . Substitut- ing LiOH with Li and KOH with K allows the comparison with explicitly charged interfaces, where the charge of the cation is compensated by electrons on the electrode. We explore potentials from -0.84 to 0.76 V vs SHE as target electrode potentials in steps of 0.4 V. We perform Langevin dynamics at 300 K, with a friction coefficient of 0.005 ps -1 and a timestep of 0.5 fs. The surface charge in FDT-SJM is updated at each timestep. The trajectories are initialized with the Maxwell-Boltzmann velocity distribution. We use the atomic simulation environment (ASE) module for the Langevin dynamics. The standard dzp-LCAO basis set and the Perdew-Burke-Ernzerhof (PBE) functional for the exchange energy are employed. This setup is convenient for reducing the computational cost of the simulations, as inter alia we are testing the implementation of the code. The two gold bottom-layers are fixed during the simulation. For clarity and brevity, the extensive analysis of the systems with K, or Li and the simulations at all the potentials are available in the Supporting Information (SI). In the SI, we also include all parameters as well as an example input script.