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Preparation of Polyaniline Anode Materials and Their Applications in Benthonic Sediment Microbial Fuel Cell

Author: ZhaoZhongKai
Tutor: FuYuBin
School: Ocean University of China
Course: Materials Physics and Chemistry
Keywords: Polyaniline anode material Composite anode Electrochemical Properties Seafloor sediment microbial fuel cell
CLC: TM911.45
Type: Master's thesis
Year: 2011
Downloads: 108
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Abstract


The microbial fuel cell (Microbial Fuel Cell, MFC) is a use of the catalytic role of microbial electricity production will be inorganic or organic matter converting chemical energy into electrical energy, with a clean and non-polluting, electricity production and degradation of organic waste and other characteristics. Seafloor sediment microbial fuel cell (Benthic Sediment Microbial Fuel Cell, BMFC) is a special kind of MFC. The BMFC the anode buried in anaerobic marine sediments connected to the cathode through an external circuit with upper seawater. The BMFC expected continued supply of small instruments for remote marine areas. However, the smaller output power density limits BMFC practical application. Electricity production between microbes and anode of the electron transfer rate is an important factor in determining battery performance. The nature and structure of the electricity production of microorganisms attached to the anode material, the oxidation of the electron transfer and the substrate are closely related. Polyaniline having a high conductivity, environmental stability and oxidation-reduction activity, it have wide applications in the secondary battery and the electrocatalytic. In the present work, we prepared four polyaniline anode material, and they were prepared into a composite anode application BMFC. Four polyaniline anode materials could significantly improve the performance of the battery, it is expected to obtain a high output power density applications in BMFC. The main content and the results are as follows: (1) preparing a new type of camphorsulfonic acid doped polyaniline (PANI-(D-CSA)) composite anodes. The best ratio of measured electrochemical properties, and applications in BMFC. Polyaniline anode materials were characterized by XRD diffraction, thermogravimetric. Structural analysis showed that, PANI-(D-CSA) for partially crystalline, with good thermal stability. Performance tests show that: PANI-(D-CSA) mass fraction of 50% of the composite anode having a minimum internal resistance, the anodic polarization curve slope minimum, while the output power density of the battery was significantly increased, the maximum output power density reached 233.9 mW/m2 is 3.7 times that of pure graphite anode. (2) Preparation of sulfonated polyaniline, sulfonated polyaniline permanganate complexes, the sulfonated polyaniline vanadate composite the three anode material and its application in BMFC respectively. Using XRD, characterized by the thermal gravimetric analysis of the chemical composition and morphology of the anode material. Since the polytetrafluoroethylene (PTFE) added result in decrease in hydrophilicity of the composite anode, by linear sweep voltammetry curves and the Tafel curve to study the electrochemical properties of the composite anode. Compared with the graphite anode (34.1 mW / m 2 ), sulfonated polyaniline, sulfonated polyaniline permanganate composite anode, sulfonated polyaniline vanadate composite anode maximum output power density. of 129.1,140.6 Ω and 187.1 mW / m 2 . The apparent internal resistance is reduced by 10644Ω (graphite anode) 3253,2402 and 1716 exchange current density of 2.2189 × 10 -7 A / cm 2 (graphite anode) increase to 2.3015 × 10 -6 3.6308 × 10 -6 and 5.9863 × 10 -6 A / cm 2 . Here, we propose a collaborative mechanism of sulfonated polyaniline vanadate, a reasonable interpretation of the improvement of the electrochemical properties.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell > Biochemical fuel cells,microbial fuel cells
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