| Summary: | 碩士 === 國立中興大學 === 精密工程學系所 === 103 === The purpose of this research is the use of a modified carbon cloth cathode electrode to enhance self-pumping glucose oxidase fuel cell electricity. Because the cathode reaction requires a large reduction current, the carbon nanotubes mixed acid can enhance the redox current as used in the cathode carbon cloth electrode. Through electrochemical analysis to prove nanotubes mixed acid can effectively enhance the redox current. First, the dispersion observation shows a better dispersion of caffeic acid as a main acid, and then by UV / Vis spectrophotometer measured caffeic acid after the carbon nanotubes addition. The absorbance increases dramatically and will not change the original nature of caffeic acid. Second, cyclic voltammetry was used to compare different concentrations of caffeic acid and filled with different gases of carbon nanotubes mixed acid solution. The concentrations of caffeic acid 10mM with charging of the oxygen, saturated deposit the maximum current 0.756 mA can be achieved. By using a droppen to carbon nanotubes - caffeic acid, they were bound to the carbon cloth electrode. According to the experimental analysis, the anode and cathode flow rate were 0.416 μl s-1 and 0.844 μl s-1 respectively. And the capillary driven liquid efficiency of anode and cathode flow field was 30 % and 59 % respectively. The Tafel test result for self-pumping fluid enzymatic fuel cell showing a power output of p = 0.592 mW cm-2 (123.669 mW cm-3) was achieved. Furthermore, the current output performance of long term experiments at a constant voltage of 0.44V indicated that the self-pumping fluid enzymatic fuel cell may work stably under a continuous fuel supply.
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