| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 96 === The cyanobacterium (blue-green alga) is a goal in this research proposal, because it is a autotroph, not only utilizes carbon dioxide as an unique carbon source but also produces oxygen under the photosynthesis.
The cyanobacterium is different from that of phototrophic bacterium not producing oxygen under photosynthesis.
The characteristic of the cyanobacterium is between the alga and the bacterium. The necessity of the nutrition of alga is simple, and the culture and control of the alga is easy. The structure of the bacterium is simple. (not including cell nucleus, gland body and Golgi body etc.) Its operation is easy to control.
The auxiliary pigments increase the utilization of energy of light. The experiment procedures are sampling, culturing, separating, purifying, inspecting, determining the content of chlorophyll a, identifying and conserving. To use nano size of polyaniline modifying the carboxylation of carbon fiber surface, to form with a high electrical conductivity, a high surface area and a biocompatible electrode material of microorganism battery. Combined with four-point probe, SEM, XRD, UV-Vis and FTIR, one can obtain the relationship among the particle size of polyaniline, redox reaction, doping compound, absorbing intensity of functional group, surface microstructure and electrical conductivity. Then one obtains the optimal synthetical conditions of the polyaniline having the best electrical conductivity. Probed into the condition that aniline adsorbe the carbon fiber by SEM, Raman, can show that the aniline has already succeeded in adsorbing the carbon fiber. With polyaniline/carbon fiber composite as an anode, the carbon fiber as a cathode, anolyte containing cyanobacteria and medium, catholyte using 0.1 M of potassium ferricyanide at pH = 7.4 phosphate buffer, and Nafion 117 as a proton exchange membrane, one assembles into the photosynthesis/microbial biofuel cell. The developed direct photosynthetic/metabolic biofuel cell (DPMFC) succeeded in generating a peak current density of 6.3 mA cm-2 and the maximum voltage of 2.8 mV with a 100 Ω load, 0.177 mW m-2 of maximum power density.
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