The performance of PEMFC ethanol sensors with identical Pt loading on electrodes as a function of%BAC and their linearity response. (a) Peak current density ofsensors with different Pt loading. (b) Charge density of sensors with different Pt loading. (c) Regression coefficient of peak current densities for sensors operating from BAC0.005–0.1% and 0.005–0.2%. (d) Regression coefficient of charge densities for sensors operating from BAC 0.005–0.1% and 0.005–0.2%.