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论文类型：期刊论文

发表时间：2017-11-01

发表刊物：CATALYSTS

收录刊物：SCIE、Scopus

卷号：7

期号：11

ISSN号：2073-4344

关键字：microbial fuel cell; anode; heat treatment; carbon brushes; power generation

摘要：The anode electrode is one of the most important components in all microbial electrochemical technologies (METs). Anode materials pretreatment and modification have been shown to be an effective method of improving anode performance. According to mass loss analysis during carbon fiber heating, five temperatures (300, 450, 500, 600, and 750 degrees C) were selected as the pre-heating temperatures of carbon fiber brush anodes. Microbial fuel cell (MFC) reactors built up with these pre-heated carbon brush anodes performed with different power densities and Coulombic efficiencies (CEs). Two kinds of measuring methods for power density were applied, and the numerical values of maximum power densities diverged greatly. Reactors with 450 degrees C anodes, using both methods, had the highest power densities, and the highest CEs were found using 500 degrees C anode reactors. The surface elements of heat-treated carbon fibers were analyzed using X-ray photoelectron spectra (XPS), and C, O, and N were the main constituents of the carbon fiber. There were four forms of N1s at the surface of the polyacrylonitrile (PAN)-based carbon fiber, and their concentrations were different at different temperature samples. The microbial community of the anode surface was analyzed, and microbial species on anodes from every sample were similar. The differences in anode performance may be caused by mass loss and by the surface elements. For carbon brush anodes used in MFCs or other BESs, 450-500 degrees C preheating was the most suitable temperature range in terms of the power densities and CEs.