Fig. 4

Current from vapor-fed FC fixed at 200 mV versus gas flow rate. Ethanol partial pressure was 1.7 mmHg, achieved by bubbling through 3% ethanol (blue diamonds). The error bars represent the standard deviation of three independent runs. The red dashed line is the prediction of the continuous stirred-tank reactor (CSTR) model, using the measured reactor volume and a rate constant obtained from the data shown in Fig. 2