A novel layer-by-layer self-assembled carbon nanotube-based anode: Preparation, characterization, and application in microbial fuel cell |
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Authors: | Juan-Juan Sun Hua-Zhang Zhao Qin-Zheng Yang An Xue |
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Affiliation: | a Department of Environmental Engineering, Peking University, Beijing 100871, China b The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China c School of Food and Bioengineering, Shandong Institute of Light Industry, Jinan 250353, China |
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Abstract: | To exploit the outstanding ability of carbon nanotubes to facilitate electron transfer in a microbial fuel cell (MFC) system, multi-wall carbon nanotube (MWNT) and polyeletrolyte polyethyleneimine (PEI) were employed to modify carbon paper (TP) electrode utilizing a layer-by-layer (LBL) assemble technique for the first time, and the performance of the modified electrode as an anode in MFC was investigated. This modification strategy ensured a relatively high content of MWNTs within the polymer matrix. IR and cyclic voltammetry (CV) demonstrated the uniform formation of a polyethyleneimine/MWNT multilayer composite on the TP surface. The SEM profiles presented a three-dimensional MWNTs interwoven network surface structure with a large accessible surface area. Electrochemical impedance spectroscopy (EIS) measurements confirmed that the existence of polyelectrolyte/MWNT multilayers decreased the interfacial charge transfer resistance from 1163 to 258 Ω. With the modified anode, the MFC produced a higher power density with 20% enhancement comparing to the bare TP anode. The MWNT-based LBL self-assembled electrode is promising for the electricity production by MFC. |
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Keywords: | Electrode modification Layer-by-layer self-assembly Microbial fuel cell Multi-wall carbon nanotubes |
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