Immediately after start-up,
relatively low open circuit voltage (OCV, 17 mV) and power density
(PD, 0.32 mW/m2
) were observed (Fig. 2a). With time, marked
improvement in OCV and PD was observed accounting for a maximum of 443 mV and 162.4 mW/m2
, respectively on 9th day of
SBES operation.