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(A) Biogas composition of cathode chamber headspace for Harbor N and Harbor SP cathodes after 1 week of incubation at −339 mV (day 0 to day 7), −439 mV (day 7 to day 14), or −539 mV (day 14 to day 21). (B) Gases in the reactor headspace and current for the Harbor N reactor over a 16-day period (the headspace was initially flushed with N2 and CO2) after samples had been cultivated for 45 days (the gray undulating line represents electric current at an applied potential of −439 mV).
