Ionic liquids with the imidazolium cation exhibit a high electrochemical stability, besides Hydroxide groups can be incorporated to the cation as side chains acting as carriers in order to facilitate the proton transport. In this work, the impact of 1-(2-Hydroxyethyl)-3-Methylimidazolium Hydroxide [EtOHMIM⁺][OH⁻] ionic liquid have been tested as electrolyte in PEMFC. The operational duration of the cell was evaluated in an electric motor-simulating load conditions. Systematic investigation of the ionic conductivity showed that the ionic conductivity reached local maxima at the compositions of [H2O]/[EtOHMIM⁺][OH⁻] = 30 ml/15 ml. Results indicated that a 50% concentration of ionic liquid maximized cell power output, increasing it from 2,7 W to 2,82 W. Although some improvements in terms of thermal and mechanical stability should be achieved, this approach presents a promising electrolyte with excellent characteristics.