The peak current densities shown in Fig. 6(a) revealed that the trend of current generation of sensors with non-identical anode loading is similar to identical electrode sensors. The current density sensitivity factor of non-identical electrode sensors were calculated respect to total mass Pt loading in sensor for 10%, 20%, 30% and 40% Pt/C anode loadings. Table 3 listed the sensitivity values for non-identical sensors. The sensors with 40% Pt/C and 0.3 mg/cm2 loading on the anode side showed the highest sensitivity and peak current density. Fig. 6(b) shows the charge density also follows the linear behavior by increasing the ethanol concentration (%BAC). The charge density sensitivity factors of this kind of sensors were also calculated for 10%, 20%, 30% and 40% Pt/C anode loadings. The calculated least square coefficient (R2) demonstrated in Figs. 6(c) and 7 (d) shows that the sensors with low Pt loading on the cathode have a good linearity response. Only the sensor with 20% Pt/C and 0.2 mg/cm2 anode loading deviated from linear behavior. The R2 values for both peak current and charge densities are high.