| Summary: | 碩士 === 國立清華大學 === 材料科學工程學系 === 99 === This study reports on zero bias, solar-driving and Fenton-enhanced microbial fuel cells(MFCs) that contain Fe-doped rutile TiO2 nanowires and Pt/C/nafion as a novel cathode catalyst. Pseudomonas aeruginosa was colonized as the anode. The hydroxyl radicals (•OH) produced via Fenton’s reaction promoted the generation of electricity in MFCs. The MFC containing Fe-doped TiO2 nanowires as a cathode stimulate the fenton reaction ; as a result, the open circuit potential can be enhanced from 602 to 733 mV and the maximum power density increased from 1952 to 2986 μW/m2.
In addition, a substantial current enhancement from 5.4 to 6.1μA in a solar-driving MFC device that is based on a photocathode (with a projected area of 1.747 cm2) at zero bias is demonstrated under illumination by white visible light 900 lux when the system is connected to a resistance of 400Ω. The maximum power density under illumination by white light was remarkably enhanced from 2986 to 11140μW/m2 and the open circuit potential was enhanced from 733 to 741 mV.
In conclusion, the results of this study show that rutile Fe-doped TiO2 nanowires, and other expected semiconductor materials may serve as cost-effective alternative catalysts to reduce the use of noble metals in MFC applications and create new opportunities for microbial/nanoelectronic hybrid devices in energy conversion, environmental protection, and biomedical application.
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