Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 25, Pages 16170-16177Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03425
Keywords
microbial fuel cells; bioaffinity; electrochemistry; graphene foams; multiwalled carbon nanotubes
Funding
- National Basic Research Program of China [2011CB933502]
- National Natural Science Foundation of China [21175065, 21375059, 21335004]
- Deanship of Scientific Research at King Saud Univ. [PRG-1437-32]
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Promoting the performance of microbial fuel cells (MFCs) relies heavily on the structure design and composition tailoring of electrode materials. In this work, three-dimensional (3D) macroporous graphene foams incorporated with intercalated spacer of multiwalled carbon nanotubes (MWCNTs) and bacterial anchor of Fe3O4. nanospheres (named as G/MWCNTs/Fe3O4 foams) were first synthesized and used as anodes for Shewanella-inoculated microbial fuel cells (MFCs). Thanks to the macroporous structure of 3D graphene foams, the expanded electrode surface by MWCNTs spacing, as well as the high affinity of Fe3O4 nanospheres toward Shewanella oneidensis MR-1, the anode exhibited high bacterial loading capability. In addition to spacing graphene nanosheets for accommodating bacterial cells, MWCNTs paved a smoother way for electron transport in the electrode substrate of MFCs. Meanwhile, the embedded bioaffinity Fe3O4 nanospheres capable of preserving the bacterial metabolic activity provided guarantee for the long-term durability of the MFCs. With these merits, the constructed MFC possessed significantly higher power output and stronger stability than that with conventional graphite rod anode.
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