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Power generation from a hybrid biological fuel cell in seawater
Guinevere Strack1, Heather R Luckarift, Susan R Sizemore
1Microbiology and Applied Biochemistry Laboratory, Airbase Technologies Division, US Air Force Research Laboratory, Tyndall Air Force Base, FL 32403, United States.
Abstract:
A hybrid biological fuel cell (HBFC) comprised of a microbial anode for lactate oxidation and an enzymatic cathode for oxygen reduction was constructed and then tested in a marine environment. Shewanella oneidensis DSP-10 was cultivated in laboratory medium and then fixed on a carbon felt electrode via a silica sol-gel process in order to catalyze anodic fuel cell processes. The cathode electrocatalyst was composed of bilirubin oxidase, fixed to a carbon nanotube electrode using a heterobifunctional cross linker, and then stabilized with a silica sol-gel coating. The anode and cathode half-cells provided operating potentials of -0.44 and 0.48 V, respectively (vs. Ag/AgCl). The HBFC maintained a reproducible open circuit voltage >0.7 V for 9 d in laboratory settings and sustained electrocatalytic activity for >24h in open environment tests.
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