Table 2. Electricity generating profile under SP operation with three controlled anode potentials.

	SP-H		SP-M		SP-L
Anode potential (vs SHE)	+100 mV		–50 mV		–200 mV
Reactor ID	a	b	a	b	a	b
Phase I (day 55–75)
Current (mA)a	32.2	31.2	16.2	21.1	6.9	2.5
±s.d.	±3.5	±2.6	±1.0	±4.2	±1.8	±1.0
Current density (mA cm−2)b	0.325	0.315	0.163	0.213	0.069	0.026
±s.d.	±0.035	±0.026	±0.010	±0.042	±0.018	±0.010
Max. current density (mA cm−2)b,c	0.270	0.305	0.215	0.323	0.219	0.027
CE (%)d	50	46	40	41	28	12
±s.d.	±5	±4	±4	±4	±5	±6
Phase II (day 135–155)
Current (mA)a	24.2	19.9	20.0	21.7	7.0	3.5
±s.d.	±2.9	±1.4	±2.0	±1.0	±1.0	±0.7
Current density (mA cm−2)b	0.260	0.214	0.215	0.233	0.075	0.038
±s.d.	±0.031	±0.015	±0.022	±0.011	±0.011	±0.008
Max. current density (mA cm−2)b,c	0.297	0.246	0.297	0.358	0.235	0.044
CE (%)d	43	41	43	40	35	21
±s.d.	±3	±3	±2	±3	±4	±0

Abbreviations: CE, coulombic efficiency; SP, set-potential.

^aAveraged maximum current generation for repeated batch exchanges during SP operation.

^bCurrent density was calculated per projected anode surface area.

^cMaximum current density was determined by linear sweep voltammetry at day 62 (2-month) and at day 152 (5-month).

^dCE was calculated for each batch under SP operation, and averaged during the periods (phases I and II).