期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 14, 页码 11671-11677出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19826
关键词
hierarchically porous structure; nitrogen doping; flavin; microbial fuel cells; interfacial electron transfer
资金
- Fundamental Research Funds for the Central Universities [XDJK2017A002]
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies
- Chongqing Science and Technology Commission [cstc2017jcyjAX0199]
- National Program of College Students Innovation and Entrepreneurship Training [201310635039]
Interfacial electron transfer between an electroactive biofilm and an electrode is a crucial step for microbial fuel cells (MFCs) and other bio-electrochemical systems. Here, a hierarchically porous nitrogen-doped carbon nanotubes (CNTs)/reduced graphene oxide (rGO) composite with polyaniline as the nitrogen source has been developed for the MFC anode. This composite possesses a nitrogen atom-doped surface for improved flavin redox reaction and a three-dimensional hierarchically porous structure for rich bacterial biofilm growth. The maximum power density achieved with the N-CNTs/rGO anode in S. putrefaciens CN32 MFCs is 1137 mW m(-2), which is 8.9 times compared with that of the carbon cloth anode and also higher than those of N-CNTs (731.17 mW m(-2)), N-rGO (442.26 mW m(-2)), and the CNTs/rGO (779.9 mW m(-2)) composite without nitrogen doping. The greatly improved bio-electrocatalysis could be attributed to the enhanced adsorption of flavins on the N-doped surface and the high density of biofilm adhesion for fast interfacial electron transfer. This work reveals a synergistic effect from pore structure tailoring and surface chemistry designing to boost both the bio- and electrocatalysis in MFCs, which also provide insights for the bioelectrode design in other bio-electrochemical systems.
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